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Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual 22832, 4001, 4809 and up ( For Norway & EU ) – PDF DOWNLOAD
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Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual
Book Code: SEBM025118
MACHINE MODEL SERIAL NUMBER
PC78UU-6 22832 and up
PC78US-6 4001 and up
PC78US-6 4809 and up (For Norway & EU)
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Description
Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual
FILE DETAILS:
Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual
Brands: Komatsu
Equipment Type: Hydraulic Excavator
Manuals Type: Shop Manual
Machine Model: PC78UU-6, PC78US-6
Serial Number: 22832 and up, 4001 and up, 4809 and up (For Norway & EU)
Book Code: SEBM025118
Language: English
Pages: 1025
File Format: Portable Document Format (PDF)
DESCRIPTION:
Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual
FOREWORD:
GENERAL:
This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you understand the contents of this manual and use it to full effect at every opportunity. This shop manual mainly contains the necessary technical information for operations performed in a service workshop. For ease of understanding, the manual is divided into the following chapters; these chapters are further divided into the each main group of components.
STRUCTURE AND FUNCTION:
This section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting.In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and maintenance standards.
TESTING AND ADJUSTING:
This section explains checks to be made before and after performing repairs, as well as adjustments to be made at completion of the checks and repairs. Troubleshooting charts correlating “Problems” with Causes” are also included in this section.
DISASSEMBLY AND ASSEMBLY:
This section explains the procedures for removing, installing, disassembling and assembling each component, as well as precautions for them.
MAINTENANCE STANDARD:
This section gives the judgment standards for inspection of disassembled parts. The contents of this section may be described in STRUCTURE AND FUNCTION.
OTHERS:
This section mainly gives hydraulic circuit diagrams and electric circuit diagrams. In addition, this section may give the specifications of attachments and options together.
TABLE OF CONTENTS:
Komatsu PC78UU-6, PC78US-6 Excavator Shop Manual
COVER.......................................................................................................................................................................................................................... 1 CONTENTS....................................................................................................................................................................................................................... 2 01 GENERAL..................................................................................................................................................................................................................... 30 SPECIFICATION DIMENSIONS DRAWING........................................................................................................................................................................................... 31 WORKING RANGE DRAWING...................................................................................................................................................................................................... 33 SPECIFICATIONS............................................................................................................................................................................................................. 34 WEIGHT TABLE............................................................................................................................................................................................................... 46 LIST OF LUBRICANTS AND COOLANT............................................................................................................................................................................................. 50 10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD................................................................................................................................................................................ 51 PTO........................................................................................................................................................................................................................ 52 COOLING SYSTEM............................................................................................................................................................................................................. 54 POWER TRAIN SYSTEM......................................................................................................................................................................................................... 56 SWING CIRCLE............................................................................................................................................................................................................... 58 SWING MACHINERY............................................................................................................................................................................................................ 59 TRACK FRAME AND IDLER CUSHION.............................................................................................................................................................................................. 63 IDLER...................................................................................................................................................................................................................... 65 TRACK ROLLER............................................................................................................................................................................................................... 66 CARRIER ROLLER............................................................................................................................................................................................................. 68 SPROCKET................................................................................................................................................................................................................... 69 TRACK SHOE................................................................................................................................................................................................................. 70 ARRANGEMENT OF HYDRAULIC COMPONENTS........................................................................................................................................................................................ 75 HYDRAULIC TANK AND OIL FILTER.............................................................................................................................................................................................. 78 CENTER SWIVEL JOINT........................................................................................................................................................................................................ 80 TRAVEL MOTOR............................................................................................................................................................................................................... 82 WORK EQUIPMENT CYLINDER.................................................................................................................................................................................................... 90 SOLENOID VALVE............................................................................................................................................................................................................. 95 MULTI-CONTROL VALVE........................................................................................................................................................................................................ 102 ACCUMULATOR FOR BRAKER..................................................................................................................................................................................................... 103 HYDRAULIC PUMP............................................................................................................................................................................................................. 104 CONTROL VALVE.............................................................................................................................................................................................................. 128 CLSS....................................................................................................................................................................................................................... 165 SWING MOTOR................................................................................................................................................................................................................ 202 WORK EQUIPMENT AND SWING PPC VALVE......................................................................................................................................................................................... 210 TRAVEL PPC VALVE........................................................................................................................................................................................................... 216 OFFSET PPC VALVE (PC78UU-6)ATTACHMENT PPC VALVE (PC78US-6)BLADE PPC VALVE (PC78UU,PC78US-6)................................................................................................................................ 220 WORK EQUIPMENT............................................................................................................................................................................................................. 224 DIMENSIONS OF EACH PART OF WORK EQUIPMENT.................................................................................................................................................................................. 229 AIR CONDITIONER PIPING (OPTIONAL).......................................................................................................................................................................................... 235 ELECTRIC CONTROL SYSTEM.................................................................................................................................................................................................... 237 SYSTEM COMPONENTS.......................................................................................................................................................................................................... 292 MONITOR SYSTEM............................................................................................................................................................................................................. 305 SENSORS.................................................................................................................................................................................................................... 311 20 TESTING AND ADJUSTING....................................................................................................................................................................................................... 315 STANDARD VALUE TABLE FOR ENGINE............................................................................................................................................................................................ 316 STANDARD VALUE TABLE FOR CHASSIS........................................................................................................................................................................................... 318 STANDARD VALUE TABLE FOR ELECTRIC PARTS.................................................................................................................................................................................... 327 TESTING AND ADJUSTING...................................................................................................................................................................................................... 338 LIST OF DEVICES FOR TESTING, ADJUSTING, & TROUBLESHOOTING.............................................................................................................................................................. 339 MEASURING ENGINE SPEED................................................................................................................................................................................................. 340 MEASURING EXHAUST GAS COLOR............................................................................................................................................................................................ 341 ADJUSTING VALVE CLEARANCE.............................................................................................................................................................................................. 342 MEASURING COMPRESSION PRESSURE......................................................................................................................................................................................... 343 MEASURING BLOW-BY PRESSURE............................................................................................................................................................................................. 345 TESTING AND ADJUSTING FUEL INJECTION TIMING............................................................................................................................................................................ 347 MEASURING ENGINE OIL PRESSURE.......................................................................................................................................................................................... 351 ADJUSTING ENGINE STOP SOLENOID......................................................................................................................................................................................... 352 ADJUSTING FUEL CONTROL LINKAGE......................................................................................................................................................................................... 354 ADJUSTING ENGINE SPEED SENSOR.......................................................................................................................................................................................... 356 TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EQUIPMENT,SWING,AND TRAVEL CIRCUITS................................................................................................................................... 357 MEASURING LS DIFFERENTIAL PRESSURE AND ADJUSTING LS VALVE.............................................................................................................................................................. 360 ADJUSTING PC VALVE..................................................................................................................................................................................................... 362 TESTING TVC-EPC SOLENOID OUTPUT PRESSURE............................................................................................................................................................................... 362 MEASURING CONTROL CIRCUIT PRESSURE..................................................................................................................................................................................... 364 MEASURING PPC VALVE OUTPUT PRESSURE.................................................................................................................................................................................... 365 TESTING SOLENOID VALVE OUTPUT PRESSURE................................................................................................................................................................................. 366 ADJUSTING WORK EQUIPMENT VALVE AND SWING PPC VALVE..................................................................................................................................................................... 368 TESTING TRAVEL DEVIATION............................................................................................................................................................................................... 369 TESTING PARTS WHICH CAN CAUSE HYDRAULIC DRIFT OF WORK EQUIPMENT........................................................................................................................................................ 371 MEASURING OIL LEAKAGE FROM SWING AND TRAVEL MOTORS..................................................................................................................................................................... 372 RELEASING RESIDUAL PRESSURE FROM HYDRAULIC CIRCUIT..................................................................................................................................................................... 373 TESTING CLEARANCE OF SWING CIRCLE BEARING.............................................................................................................................................................................. 374 TESTING AND ADJUSTING TRACK SHOE TENSION............................................................................................................................................................................... 375 BLEEDING AIR FROM HYDRAULIC CIRCUIT.................................................................................................................................................................................... 376 PROCEDURE FOR ADJUSTING INSTALLATION OF LONG ARM....................................................................................................................................................................... 378 TESTING AND ADJUSTING HOOD CATCH....................................................................................................................................................................................... 379 REPLACEMENT PROCEDURE OF POTENTIOMETERS................................................................................................................................................................................ 381 PROCEDURE FOR TESTING DIODE............................................................................................................................................................................................ 382 PM-CLINIC SERVICE...................................................................................................................................................................................................... 383 TROUBLESHOOTING............................................................................................................................................................................................................ 387 POINTS TO REMEMBER WHEN TROUBLESHOOTING................................................................................................................................................................................ 388 SEQUENCE OF EVENTS IN TROUBLESHOOTING.................................................................................................................................................................................. 389 PRECAUTIONS WHEN CARRYING OUT MAINTENANCE.............................................................................................................................................................................. 390 CHECKS BEFORE TROUBLESHOOTING.......................................................................................................................................................................................... 398 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 399 CONNECTOR ARRANGEMENT DIAGRAM.......................................................................................................................................................................................... 401 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 404 CONNECTOR ARRANGEMENT DIAGRAM.......................................................................................................................................................................................... 406 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 409 CONNECTOR ARRANGEMENT DIAGRAM.......................................................................................................................................................................................... 411 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 414 CONNECTOR ARRANGEMENT DIAGRAM.......................................................................................................................................................................................... 416 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 419 CONNECTOR ARRANGENMENT DIAGRAM......................................................................................................................................................................................... 421 CONNECTION TABLE FOR CONNECTOR PIN NUMBERS............................................................................................................................................................................. 424 EXPLANATION OF FUNCTIONS OF ELECTRIC SYSTEM CONTROL MECHANISM.......................................................................................................................................................... 447 DISPLAY AND SPECIAL FUNCTIONS OF MONITOR PANEL......................................................................................................................................................................... 451 TVC VALVE CURRENT ADJUSTMENT TABLE..................................................................................................................................................................................... 468 HOW TO READ FLOW OF TROUBLESHOOTING.................................................................................................................................................................................... 471 CONTENTS AND PROCEDURE OF TROUBLESHOOTING.............................................................................................................................................................................. 473 TROUBLESHOOTING OF COMMUNICATION SYSTEM (N MODE)....................................................................................................................................................................... 474 N-1 DEFECTIVE COMMUNICATION........................................................................................................................................................................................ 475 TROUBLESHOOTING FOR CONTROLLER(GOVERNOR CONTROL SYSTEM)(E MODE)........................................................................................................................................................ 477 PRECAUTIONS FOR TROUBLESHOOTING FOR CONTROLLER (GOVERNOR CONTROL SYSTEM)........................................................................................................................................... 478 ACTION TAKEN BY CONTROLLER WHEN TROUBLE OCCURS AND PROBLEMS ON MACHINE............................................................................................................................................. 479 JUDGMENT TABLE FOR CONTROLLER (GOVERNOR CONTROL SYSTEM) AND ENGINE................................................................................................................................................. 484 E-1 CONTROLLER POWER SUPPLY ID DEFECTIVE (LED OF CONTROLLER IS TURNED OFF)......................................................................................................................................... 488 E-2 [E321] (SHORT CIRCUIT IN MOTOR DRIVE RELAY) IS DISPLAYED....................................................................................................................................................... 490 E-3 [E323] (SHORT CIRCUIT IN ACCELERATOR RELAY SYSTEM) IS DISPLAYED................................................................................................................................................ 491 E-4 [E325] (SHORT CIRCUIT IN DECELERATOR REPLAY SYSTEM) IS DISPLAYED............................................................................................................................................... 494 E-5 [E328] (STALL OF MOTOR) IS DISPLAYED........................................................................................................................................................................... 497 E-6 [E227] (TROUBLE IN ENGINE SPEED SENSOR) IS DISPLAYED........................................................................................................................................................... 502 E-7 [E306] (TROUBLE IN GOVERNOR MOTOR FEEDBACK POTENTIOMETER) IS DISPLAYED......................................................................................................................................... 504 E-8 [E308] (TROUBLE IN FUEL CONTROL DIAL SYSTEM) IS DISPLAYED...................................................................................................................................................... 505 E-9 ONE-TOUCH SLOW-DOWN MECHANISM DOES NOT WORK.................................................................................................................................................................... 506 E-10 ENGINE DOES NOT START......................................................................................................................................................................................... 508 a) [E304] SHORT CIRCUIT IN ENGINE STOP SOLENOID RELAY SYSTEM IS DISPLAYED...................................................................................................................................... 508 b) [E314] DISCONNECTION IN ENGINE STOP SOLENOID RELAY SYSTEM IS DISPLAYED...................................................................................................................................... 508 c) ENGINE STOP SOLENOID SYSTEM................................................................................................................................................................................. 510 d) STARTING SYSTEM............................................................................................................................................................................................. 515 E-11 ENGINE DOES NOT STOP.......................................................................................................................................................................................... 522 TROUBLESHOOTING FOR CONTROLLER PUMP CONTROL SYSTEM (C MODE)............................................................................................................................................................ 525 PRECAUTIONS FOR TROUBLESHOOTING FOR CONTROLLER (PUMP CONTROL SYSTEM)............................................................................................................................................... 526 ACTION TAKEN BY CONTROLLER WHEN TROUBLE OCCURS AND PROBLEMS ON MACHINE............................................................................................................................................. 527 JUDGEMENT TABLE FOR CONTROLLER (PUMP CONTROL SYSTEM) AND HYDRAULIC EQUIPMENT....................................................................................................................................... 533 ELECTRIC CIRCUIT DIAGRAM OF C MODE SYSTEM.......................................................................................................................................................................... 537 C-1 [E232], C-2 [E233] TROUBLE IN TVC-EPC SOLENOID SYSTEM.......................................................................................................................................................... 547 C-3 [E203], C-4 [E213] TROUBLE IN SWING HOLDING BRAKE SOLENOID SYSTEM.............................................................................................................................................. 549 C-5 [E206], C-6 [E216] TROUBLE IN 2ND TRAVEL SPEED SELECTION SOLENOID SYSTEM....................................................................................................................................... 551 C-7 [E403] TROUBLE IN BOOM ANGLE SENSOR CORRECTION................................................................................................................................................................. 553 C-8 [E406] TROUBLE IN ARM ANGLE SENSOR CORRECTION.................................................................................................................................................................. 553 C-9 [E411] TROUBLE IN OFFSET BOOM ANGLE SENSOR CORRECTION (ONLY PC78UU-6).......................................................................................................................................... 553 C-10 [E441] TROUBLE IN INTERFERENCE PREVENTION (FRONT) CORRECTION.................................................................................................................................................. 555 C-11 [E442] TROUBLE IN INTERFERENCE PREVENTION (SIDE) CORRECTION (ONLY PC78UU-6)................................................................................................................................... 555 C-12 [E443] TROUBLE IN DEPTH INDICATION CORRECTION (ONLY PC78UU-6)................................................................................................................................................. 556 C-13 [E258] SHORT CIRCUIT IN 5V SYSTEM OF SENSOR POWER SUPPLY (ONLY PC78UU-6)...................................................................................................................................... 557 C-14 [E224] TROUBLE IN PUMP PRESSURE SENSOR IS DISPLAYED........................................................................................................................................................... 560 C-15 [E401], C-16 [E402] TROUBLE IN BOOM ANGLE SENSOR SYSTEM (ONLY PC78UU-6)....................................................................................................................................... 561 C-17 [E404], C-18 [E405] TROUBLE IN ARM ANGLE SENSOR SYSTEM (ONLY PC78UU-6)........................................................................................................................................ 562 C-19 [E407], C-20 [E408] TROUBLE IN OFFSET ANGLE SENSOR SYSTEM (ONLY PC78UU-6)..................................................................................................................................... 563 C-21 [E421] DISCONNECTION IN BOOM RAISE EPC SYSTEM IS DISPLAYED (ONLY PC78UU-6).................................................................................................................................... 564 C-22 [E422] DISCONNECTION IN BOOM RAISE EPC SYSTEM IS DISPLAYED (ONLY PC78UU-6).................................................................................................................................... 565 C-23 [E423] SHORT CIRCUIT OR GROUNDING FAULT IN ARM-IN EPC SYSTEM IS DISPLAYED (ONLY PC78UU-6)..................................................................................................................... 566 C-24 [E424] DISCONNECTION IN ARM-IN EPC SYSTEM IS DISPLAYED (ONLY PC78UU-6)........................................................................................................................................ 567 C-25 [E425] SHORT CIRCUIT OR GROUNDING FAULT IN OFFSET LEFT EPC SYSTEM IS DISPLAYED(ONLY PC78UU-6)................................................................................................................. 568 C-26 [E426] DISCONNECTION IN OFFSET LEFT EPC SYSTEM IS DISPLAYED (ONLY PC78UU-6)................................................................................................................................... 569 C-27 [E431] SHORT CIRCUIT OR GROUNDING FAULT IN PPC BASIC PRESSURE LOCK SOLENOID SYSTEM IS DISPLAYED (ONLY PC78UU-6)............................................................................................... 570 C-28 BOOM DOES NOT STOP AUTOMATICALLY AT NORMAL POSITION BUT INTERFERES WHEN IT IS RAISED(ONLY PC78UU-6)........................................................................................................... 573 C-29 ARM DOES NOT STOP AUTOMATICALLY AT NORMAL POSITION BUT INTERFERES WHEN IT IS MOVED IN (ONLY PC78UU-6)......................................................................................................... 574 C-30 OFFSET DOES NOT STOP AUTOMATICALLY AT NORMAL POSITION BUT INTERFERES WHEN IT IS MOVED TO LEFT (ONLY PC78UU-6)................................................................................................. 575 C-31 WORK EQUIPMENT STOPS OR NEAR (ONLY PC78UU-6).................................................................................................................................................................. 576 C-32 BUZZER SOUNDS FOR 7 SECONDS WHILE EMERGENCY WORK EQUIPMENT OPERATION SWITCH IS NOT TURNED ON (ONLY PC78UU-6).................................................................................................. 577 C-33 BOOM RAISE END CUSHION DOES NOT WORK AT ALL OR NORMALLY (ONLY PC78UU-6)....................................................................................................................................... 579 C-34 ARM-IN END CUSHION DOES NOT WORK AT ALL OR NORMALLY (ONLY PC78UU-6)........................................................................................................................................... 580 C-35 OFFSET ENF CUSHION DOES NOT WORK AT ALL OR NORMALLY (ONLY PC78UU-6)........................................................................................................................................... 581 C-36 WORK EQUIPMENT STOPS AFTER OR BEFORE SET HEIGHT (ONLY PC78UU-6)............................................................................................................................................... 582 C-37 WHEN DEPTH DISPLAY IS RESET,0.0M IS NOT INDICATED AT GL (ONLY PC78UU-6)....................................................................................................................................... 583 C-38 WORK EQUIPMENT STILL MOVES AFTER WORK EQUIPMENT LOCK LEVER IS SET TO LOCK..................................................................................................................................... 584 C-39 MACHINE DOES NOT SWING........................................................................................................................................................................................ 588 C-40 TRAVEL SPEED DOES NOT RISE.................................................................................................................................................................................... 590 C-41 GEAR SPEED DOES NOT CHANG AUTOMATICALLY....................................................................................................................................................................... 591 C-42 TROUBLE IN CONTROLLER POWER SUPLY SYSTEM (LED OF CONTROLLER IS TURNED OFF).................................................................................................................................... 591 TROUBLESHOOTING FOR CONTROLLER (INPUT SIGNAL SYSTEM)(F MODE)........................................................................................................................................................... 592 F-1 BIT PATTERN 1023-(4) SWING PRESSURE SWITCH DOES NOT LIGHT UP................................................................................................................................................... 593 F-2 BIT PATTERN 1023-(3) TRAVEL PRESSURE SWITCH DOES NOT LIGHT UP.................................................................................................................................................. 595 F-3 BIT PATTERN 1023-(6) BOOM RAISE PRESSURE SWITCH DOES NOT LIGHT UP.............................................................................................................................................. 597 F-4 BIT PATTERN 1023-(5) ARM IN PRESSURE SWITCH DOES NOT LIGHT UP.................................................................................................................................................. 599 F-5 BIT PATTERN 1026-(1) DECELERATION SWITCH OF LEFT KNOB DOES NOT LIGHT UP........................................................................................................................................ 601 F-6 BIT PATTERN 1026-(4) 2ND TRAVEL SPEED SELECTION SWITCH (PEDAL) DOES NOT LIGHT UP (US WITH BLADE SPECIFICATION AND UU).......................................................................................... 603 F-7 BIT PATTERN 1021-(3) COMPRESSOR SIGNAL DOES NOT LIGHT UP....................................................................................................................................................... 604 F-8 BIT PATTERN 1026-(3) EMERGENCY WORK EQUIPMENT OPERATION SWITCH DOES NOT LIGHT UP (ONLY PC78UU-6)............................................................................................................... 606 TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL SYSTEMS (H MODE).......................................................................................................................................................... 607 TABLE OF HYDRAULIC FAILURE MODES AND THEIR CAUSES.................................................................................................................................................................. 609 H-1 SPEED OR POWER OF 2 OR MORE SYSTEMS OF WORK EQUIPMENT (BOOM,ARM,BUCKET),TRAVEL,SWING,AND BLADE IS LOW.......................................................................................................... 611 a) SPEED POWER OF WORK EQUIPMENT (INCLUDING BLADE),TRAVEL,AND SWING SYSTEMS IS LOW............................................................................................................................. 611 b) SPEED OR POWER OF ALL WORK EQUIPMENT (EXCLUDING BLADE) ANF TRAVEL IS LOW.................................................................................................................................... 612 c) SPEED OR POWER OF SWING AND BLADE IS LOW.................................................................................................................................................................... 612 d) SPEED OR POWER OF TRAVEL AND BLADE IS LOW................................................................................................................................................................... 613 e) SPEED OR POWER OF ALL WORK EQUIPMENT (EXCLUDING BLADE) IS LOW............................................................................................................................................... 613 f) SPEED OR POWER OF TRAVEL AND SWING IS LOW................................................................................................................................................................... 614 g) SPEED OR POWER OF ALL WORK EQUIPMENT AND SWING IS LOW....................................................................................................................................................... 614 H-2 ENGINE SPEED LOWERS EXTREMELY OR ENGINE STALLS................................................................................................................................................................. 615 H-3 2 OR MORE SYSTEMS OF WORK EQUIPMENT (BOOM,ARM,BUCKET),TRAVEL,SWING,AND BLADE DO NOT MOVE....................................................................................................................... 617 a) ALL WORK EQUIPMENT (INCLUDING BLADE),TRAVEL,AND SWING SYSTEMS DO NOT MOVE................................................................................................................................... 617 b) ALL WORK EQUIPMENT (EXCLUDING BLADE) AND TRAVEL SYSTEMS DO NOT MOVE......................................................................................................................................... 618 c) SWING AND BLADE SYSTEMS DO NOT MOVE......................................................................................................................................................................... 618 d) TRAVEL AND BLADE SYSTEMS DO NOT MOVE........................................................................................................................................................................ 619 e) ALL WORK EQUIPMENT (EXCLUDING BLADE) DOES NOT MOVE.......................................................................................................................................................... 619 H-4 ABNORMAL SOUND COMES OUT (FROM AROUND PUMP).................................................................................................................................................................... 620 H-5 FINE CONTROLLABILITY OR RESPONSE IS LOW........................................................................................................................................................................ 621 H-6 HYDRAULIC DRIFT IS LARGE (ALL WORK EQUIPMENT AND BLADE)........................................................................................................................................................ 622 H-7 BOOM SPEED OR POWER IS LOW (OTHER WORK EQUIPMENT IS NORMAL).................................................................................................................................................... 623 a) BOOM RAISE SPEED OR POWER IS LOW............................................................................................................................................................................ 623 b) BOOM LOWER SPEED OR POWER IS LOW............................................................................................................................................................................ 624 H-8 ARM SPEED OR POWER IS LOW (OTHER WORK EQUIPMENT IS NORMAL)..................................................................................................................................................... 625 a) ARM IN SPEED OR POWER IS LOW................................................................................................................................................................................ 625 b) ARM OUT SPEED OR POWER IS LOW............................................................................................................................................................................... 627 H-9 BUCKET SPEED OR POWER IS LOW (OTHER WORK EQUIPMENT IS NORMAL).................................................................................................................................................. 628 a) BUCKET CURL SPEED OR POWER IS LOW........................................................................................................................................................................... 628 b) BUCKET DUMP SPEED OR POWER IS LOW........................................................................................................................................................................... 629 H-10 OFFSET SPEED OR POWER IS LOW (OTHER WORK EQUIPMENT IS NORMAL)(ONLY PC78UU-6).................................................................................................................................. 630 a) OFFSET LEFT SPEED OR POWER IS LOW........................................................................................................................................................................... 630 b) OFFSET RIGHT SPEED OR POWER IS LOW.......................................................................................................................................................................... 631 H-11 BOOM DOES NOT MOVE............................................................................................................................................................................................ 632 a) BOOM DOES NOT RISE.......................................................................................................................................................................................... 632 b) BOOM DOES NOT LOWER......................................................................................................................................................................................... 633 H-12 ARM DOES NOT MOVE............................................................................................................................................................................................. 634 a) ARM DOES NOT MOVE IN........................................................................................................................................................................................ 634 b) ARM DOES NOT MOVE OUT....................................................................................................................................................................................... 635 H-13 BUCKET DOES NOT MOVE.......................................................................................................................................................................................... 636 a) BUCKET DOES NOT CURL........................................................................................................................................................................................ 636 b) BUCKET DOES NOT DUMP........................................................................................................................................................................................ 637 H-14 OFFSET BOOM DOES NOT MOVE (ONLY PC78UU-6)..................................................................................................................................................................... 638 a) OFFSET BOOM LEFT DOES NOT MOVE.............................................................................................................................................................................. 638 b) OFFSET BOOM RIGHT DOES NOT MOVE............................................................................................................................................................................. 639 H-15 HYDRAULIC DRIFT OF BOOM IS LARGE.............................................................................................................................................................................. 640 H-16 HYDRAULIC DRIFT OF ARM IS LARGE............................................................................................................................................................................... 640 H-17 HYDRAULIC DRIFT OF BUCKET IS LARGE............................................................................................................................................................................ 641 H-18 HYDRAULIC DRIFT OF OFFSET IS LARGE (ONLY PC78UU-6)............................................................................................................................................................ 641 a) HYDRAULIC DRIFT OF OFFSET TO LEFT IS LARGE.................................................................................................................................................................. 641 b) HYDRAULIC DRIFT OF OFFSET TO RIGHT IS LARGE................................................................................................................................................................. 641 H-19 TIME LAG IS LARGE (WHEN ENGINE SPEED IS LOW).................................................................................................................................................................. 642 H-20 PART LOADED MORE MOVES SLOWER IN COMPOUND OPERATION OF WORK EQUIPMENT......................................................................................................................................... 642 H-21 BOOM RAISE SPEED IS LOW IN COMPOUND OPERATION OF SWING AND BOOM RAISE......................................................................................................................................... 643 H-22 TRAVEL SPEED LOWERS EXTREMELY IN COMPOUND OPERATION OF TRAVEL AND BOOM RAISE.................................................................................................................................. 643 H-23 SPEED IS LOW IN COMPOUND OPERATION OF WORK EQUIPMENT RELIEF AND SWING,WORK EQUIPMENT RELIEF AND OTHER WORK EQUIPMENT.......................................................................................... 643 H-24 WORK EQUIPMENT DOES NOT MOVE OR ITS SPEED IS LOW IN COMPOUND OPERATION OF TRAVEL AND WORK EQUIPMENT........................................................................................................... 644 H-25 TRAVEL DEVIATION IS LARGE..................................................................................................................................................................................... 645 a) TRAVEL DEVIATION IS LARGE DURING ORDINARY TRAVEL............................................................................................................................................................ 645 b) TRAVEL DEVIATION IS LARGE WHEN MACHINE STARTS(BUT NORMAL DURING ORDINARY TRAVEL)............................................................................................................................ 646 H-26 TRAVEL DEVIATION IS LARGE IN COMPOUND OPERATION OF TRAVEL AND SWING,TRAVEL AND WORK EQUIPMENT................................................................................................................. 647 H-27 TRAVEL SPEED OR POWER IS LOW (WORK EQUIPMENT,SWING,AND BLADE OPERATIONS ARE NORMAL)........................................................................................................................... 648 H-28 MACHINE CANNOT BE STEERED SHARPLY OR STEERING FORCE IS INSUFFICIENT........................................................................................................................................... 650 H-29 TRAVEL SPEED DOES NOT CHANGE AT ALL OR DOES NOT CHANGE QUICKLY................................................................................................................................................ 651 H-30 MACHINE DOES NOT TRAVEL....................................................................................................................................................................................... 652 H-30 SUPPLEMENT.................................................................................................................................................................................................... 653 H-31 OVERRUN OF TRAVEL IS LARGE.................................................................................................................................................................................... 654 H-32 TRAVEL HYDRAULIC DRIFT IS LARGE............................................................................................................................................................................... 654 H-33 FINE CONTROLLABILITY OR RESPONSE IS LOW....................................................................................................................................................................... 655 H-34 SWING SPEED OR POWER IS LOW (WORK EQUIPMENT,TRAVEL,AND BLADE OPERATIONS ARE NORMAL)........................................................................................................................... 656 H-35 MACHINE DOES NOT SWING (WORK EQUIPMENT,TRAVEL,AND BLADE OPERATIONS ARE NORMAL)................................................................................................................................ 659 a) SWING SPEED OR POWER IS LOW IN BOTH DIRECTIONS.............................................................................................................................................................. 659 b) SWING SPEED OR POWER IS LOW IN EITHER DIRECTION............................................................................................................................................................. 660 H-36 SWING ACCELERATION IS LOW..................................................................................................................................................................................... 661 a) SWING ACCELERATION IS LOW IN BOTH DIRECTIONS................................................................................................................................................................ 661 b) SWING ACCELERATION IS LOW IN EITHER DIRECTION .............................................................................................................................................................. 661 H-37 OVERRUN OF SWING IS LARGE..................................................................................................................................................................................... 662 a) OVERRUN OF SWING IS LARGE IN BOTH DIRECTIONS................................................................................................................................................................ 662 b) OVERRUN OF SWING IS LARGE IN EITHER DIRECTION............................................................................................................................................................... 662 H-38 LARGE SHOCK IS MODE WHEN MACHINE STOPS SWINGING............................................................................................................................................................... 663 H-39 LARGE ABNORMAL SOUND IS MODE WHEN MACHINE STOPS SWINGING...................................................................................................................................................... 663 H-40 SWING HYDRAULIC DRIFT IS LARGE................................................................................................................................................................................ 664 H-41 FINE CONTROLLABILITY OR RESPONSE OF SWING IS LOW.............................................................................................................................................................. 665 H-42 BLADE SPEED OR POWER IS LOW (WORK EQUIPMENT,TRAVEL,AND SWING OPERATIONS ARE NORMAL)........................................................................................................................... 666 H-43 BLADE DOES NOT MOVE (WORK EQUIPMENT,TRAVEL,AND SWING OPERATIONS ARE NORMAL)................................................................................................................................... 667 a) BLADE DOES NOT RISE......................................................................................................................................................................................... 667 b) BLADE DOES NOT LOWER........................................................................................................................................................................................ 668 H-44 HYDRAULIC DRIFT OF BLADE IS LARGE............................................................................................................................................................................. 669 H-45 FINE CONTROLLABILITY OR RESPONSE OF BLADE IS LOW.............................................................................................................................................................. 670 H-46 MONITOR PANEL DISPLAYS ERROR CODE AND BOOM RAISE,ARM IN,AND OFFSET LEFT OPERATIONS STOP JUST BEFORE INTERFERENCE(ONLY PC78UU-6)............................................................................... 671 H-47 MACHINE DOES NOT STOP BOOM RAISE,ARM IN,AND OFFSET LEFT OPERATIONS AUTOMATICALLY BUT INTERFERES (ONLY PC78UU-6)............................................................................................... 671 TROUBLESHOOTING FOR MACHINE MONITOR SYSTEM(M MODE)..................................................................................................................................................................... 672 ACTION TAKEN BY CONTROLLER WHEN TROUBLE OCCURS AND PROBLEMS ON MACHINE............................................................................................................................................. 673 ELECTRIC CIRCUIT DIAGRAM OF M MODE SYSTEM.......................................................................................................................................................................... 675 M-1 [E101](ERROR HISTORY DATA ARE ABNORMAL) IS DISPLAYED........................................................................................................................................................... 681 M-2 [E108](ENGINE COOLANT TEMPERATURE IS 105℃) IS DISPLAYED........................................................................................................................................................ 683 M-3 [E112](WIPER FORWARD OUTPUT IS SHORTED) IS DISPLAYED........................................................................................................................................................... 683 M-4 [E113](WIPER REVERSE OUTPUT IS SHORTED) IS DISPLAYED........................................................................................................................................................... 683 M-5 [E114](CONTACT WITH WASHER OUTPUT OF 24 V) IS DISPLAYED........................................................................................................................................................ 683 M-6 [E115](WIPER DOES NOT START WIPING IN 10 SECONDS) IS DISPLAYED................................................................................................................................................. 683 M-7 [E116](WIPER IS NOT RETRACTED IN 10 SECONDS) IS DISPLAYED...................................................................................................................................................... 683 M-8 WHEN STARTING SWITCH IS TURNED TO ON POSITION,MONITOR PANEL SEGMENTS DO NOT LIGHT UP FOR 3 SECONDS............................................................................................................. 684 a) MONITOR PANEL SEGMENTS DO NOT LIGHT UP AT ALL............................................................................................................................................................... 684 b) SOME MONITOR PANEL SEGMENTS DO NOT LIGHT UP................................................................................................................................................................. 684 M-9 WHEN STARTING SWITCH IS SET TO ON POSITION,ALL MONITOR PANEL SEGMENTS LIGHT UP BUT DO NOT GO OFF............................................................................................................... 686 M-10 WHILE PREHEATING IS NOT EXECUTED,"PREHEATER MONITOR" LIGHTS UP................................................................................................................................................ 686 M-11 WHEN STARTING SWITCH IS SET TO ON POSITION AND ENGINE IS STARTED, BASIC CHECK ITEMS FLASH..................................................................................................................... 687 a) ALTERNATOR SYSTEM........................................................................................................................................................................................... 687 b) ENGINE OIL SYSTEM........................................................................................................................................................................................... 689 M-12 WHEN STARTING SWITCH IS SET TO ON POSITION (BUT ENGINE IS STOPPED),CAUTION ITEMS AND EMERGENCY STOP ITEMS (EXCLUDING BATTERY AND ENGINE OIL) FLASH............................................................ 691 a) ALTERNATOR SYSTEM........................................................................................................................................................................................... 691 b) ENGINE OIL PRESSURE SENSOR SYSTEM........................................................................................................................................................................... 693 M-13 WHEN STARTING SWITCH IS SET TO ON POSITION AND ENGINE IS STARTED,CAUTION ITEMS AND EMERGENCY STOP ITEMS FLASH (WHEN THERE IS NOT ABNORMALITY IN INSPECTION ITEMS AND ENGINE BEFOR TROUBLESHOOTING,HOWEVER).... 695 a) "ENGINE OIL" FLASHES........................................................................................................................................................................................ 695 b) "CHARGE LEVEL" FLASHES...................................................................................................................................................................................... 695 c) "COOLANT TEMPERATURE" FLASHES............................................................................................................................................................................... 696 d) "FUEL LEVEL" FLASHES........................................................................................................................................................................................ 698 M-14 WHEN STARTING SWITCH IS SET TO ON POSITION (BUT ENGINE IS STOPPED),BUZZER DOES NOT SOUND FOR 1 SECOND WHILE CAUTION ITEM IS FLASHING,BUZZER DOES NOT SOUND.................................................... 700 M-15 MONITOR PLANE LAMP FOR NIGHTTIME IS NOT TURNED ON (LC DISPLAY IS NORMAL)...................................................................................................................................... 702 M-16 COOLANT TEMPERATURE GAUGE DOES NOT RISE....................................................................................................................................................................... 704 M-17 COOLANT TEMPERATURE GAUGE IS NOT DISPLAYED (GAUGE DOES NOT RISE TO 1ST LINE DURING OPERATION)................................................................................................................. 706 M-18 FUEL LEVEL GAUGE ALWAYS DISPLAYS FULL......................................................................................................................................................................... 708 M-19 FUEL LEVEL GAUGE IS NOT DISPLAYED............................................................................................................................................................................. 710 M-20 WHILE ENGINE IS RUNNING,SERVICE METER DOES NOT ADVANCE........................................................................................................................................................ 712 M-21 TROUBLE IN FUEL LEVEL SENSOR.................................................................................................................................................................................. 713 M-22 TROUBLE IN COOLANT TEMPERATURE SENSOR......................................................................................................................................................................... 715 M-23 WIPER DOES NOT OPERATE OR OPERATES WHILE WIPER SWITCH IS TURNED OFF........................................................................................................................................... 716 a) WIPER DOES NOT OPERATE...................................................................................................................................................................................... 716 b) WIPER OPERATES WHILE WIPER SWITCH IS TURNNED OFF............................................................................................................................................................ 716 M-24 WASHER MOTOR DOES NOT OPERATE OR OPERATES WHILE WASHER SWITCH IS TURNED OFF................................................................................................................................... 721 a) WASHER MOTOR DOES NOT OPERATE............................................................................................................................................................................... 721 b) WASHER OPERATES WHILE WIPER SWITCH IS TURNED OFF............................................................................................................................................................ 721 M-25 DEPTH SET 0 MODE AND HEIGHT MODE CANNOT BE SELECTED AND SET (ONLY PC78UU-6)................................................................................................................................... 724 30 DISASSEMBLY AND ASSEMBLY.................................................................................................................................................................................................... 725 METHOD OF USING MANUAL..................................................................................................................................................................................................... 726 PRECAUTIONS WHEN CARRYING OUT OPERATION.................................................................................................................................................................................... 727 SPECIAL TOOL LIST.......................................................................................................................................................................................................... 731 COUNTERWEIGHT.............................................................................................................................................................................................................. 739 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 739 INJECTION PUMP............................................................................................................................................................................................................. 741 REMOVAL................................................................................................................................................................................................................ 741 INSTALLATION........................................................................................................................................................................................................... 742 CYLINDER HEAD.............................................................................................................................................................................................................. 747 REMOVAL................................................................................................................................................................................................................ 747 INSTALLATION........................................................................................................................................................................................................... 749 MAIN PUMP.................................................................................................................................................................................................................. 755 REMOVAL................................................................................................................................................................................................................ 755 INSTALLATION........................................................................................................................................................................................................... 756 CONTROLL PUMP.............................................................................................................................................................................................................. 757 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 757 ENGINE AND MAIN PUMP....................................................................................................................................................................................................... 758 REMOVAL................................................................................................................................................................................................................ 758 INSTALLATION........................................................................................................................................................................................................... 760 ENGINE HOOD ASSEMBLY....................................................................................................................................................................................................... 761 REMOVAL................................................................................................................................................................................................................ 761 INSTALLATION........................................................................................................................................................................................................... 761 HYDRAULIC OIL COOLER....................................................................................................................................................................................................... 762 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 762 RADIATOR................................................................................................................................................................................................................... 764 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 764 SWING MOTOR AND SWING MACHINERY............................................................................................................................................................................................ 766 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 766 SWING MACHINERY............................................................................................................................................................................................................ 767 DISASSEMBLY............................................................................................................................................................................................................ 767 ASSEMBLY............................................................................................................................................................................................................... 769 SWING MOTOR................................................................................................................................................................................................................ 777 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 777 CENTER SWIVEL JOINT........................................................................................................................................................................................................ 778 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 778 CONTROL VALVE.............................................................................................................................................................................................................. 780 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 780 WORK EQUIPMENT PPC VALVE................................................................................................................................................................................................... 782 ASSEMBLY............................................................................................................................................................................................................... 782 TRAVEL PPC VALVE........................................................................................................................................................................................................... 784 ASSEMBLY............................................................................................................................................................................................................... 784 HYDRAULIC TANK............................................................................................................................................................................................................. 785 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 785 FUEL TANK.................................................................................................................................................................................................................. 788 REMOVAL................................................................................................................................................................................................................ 788 INSTALLATION........................................................................................................................................................................................................... 789 CONTROLLER................................................................................................................................................................................................................. 792 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 792 MONITOR PANEL.............................................................................................................................................................................................................. 793 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 793 AIR CONDITIONER UNIT....................................................................................................................................................................................................... 794 REMOVAL................................................................................................................................................................................................................ 794 INSTALLATION........................................................................................................................................................................................................... 795 OPERATOR'S CAB............................................................................................................................................................................................................. 796 REMOVAL................................................................................................................................................................................................................ 796 INSTALLATION........................................................................................................................................................................................................... 797 FLOOR FRAME................................................................................................................................................................................................................ 798 REMOVAL................................................................................................................................................................................................................ 798 INSTALLATION........................................................................................................................................................................................................... 799 OPERATOR'S CAB GLASS (STUCK GLASS)......................................................................................................................................................................................... 800 REMOVAL................................................................................................................................................................................................................ 801 INSTALLATION........................................................................................................................................................................................................... 802 FRONT WINDOW............................................................................................................................................................................................................... 810 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 810 REVOLVING FRAME............................................................................................................................................................................................................ 811 REMOVAL................................................................................................................................................................................................................ 811 INSTALLATION........................................................................................................................................................................................................... 813 SWING CIRCLE............................................................................................................................................................................................................... 814 REMOVAL AND INSATLLATION............................................................................................................................................................................................... 814 WORK EQUIPMENT............................................................................................................................................................................................................. 815 REMOVAL................................................................................................................................................................................................................ 815 INSTALLATION........................................................................................................................................................................................................... 817 FIRST BOOM................................................................................................................................................................................................................. 821 REMOVAL................................................................................................................................................................................................................ 821 INSTALLATION........................................................................................................................................................................................................... 823 SECOND BOOM................................................................................................................................................................................................................ 824 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 824 OFFSET BRACKET............................................................................................................................................................................................................. 825 REMOVAL................................................................................................................................................................................................................ 825 INSTALLATION........................................................................................................................................................................................................... 826 STEEL SHOE, RUBBER PAD SHOE, ROAD LINER.................................................................................................................................................................................... 827 EXPANSION AND INSTALLATION............................................................................................................................................................................................. 827 RUBBER SHOE................................................................................................................................................................................................................ 828 REMOVAL AND INSTALLATION............................................................................................................................................................................................... 828 FINAL DRIVE AND TRAVEL MOTOR.............................................................................................................................................................................................. 828 REMOVAL................................................................................................................................................................................................................ 828 INSTALLATION........................................................................................................................................................................................................... 829 TRAVEL MOTOR............................................................................................................................................................................................................... 830 DISASSEMBLY AND ASSEMBLY............................................................................................................................................................................................... 830 IDLER...................................................................................................................................................................................................................... 881 ASSEMBLY............................................................................................................................................................................................................... 881 RECOIL SPRING.............................................................................................................................................................................................................. 883 DISASSEMBLY............................................................................................................................................................................................................ 883 ASSEMBLY............................................................................................................................................................................................................... 884 TRACK ROLLER............................................................................................................................................................................................................... 885 DISASSEMBLY............................................................................................................................................................................................................ 885 ASSEMBLY............................................................................................................................................................................................................... 886 HYDRAULIC CYLINDER......................................................................................................................................................................................................... 888 DISASSEMBLY............................................................................................................................................................................................................ 888 ASSEMBLY............................................................................................................................................................................................................... 889 50 OTHER SPECIFICATIONS........................................................................................................................................................................................................ 892 PC78US-6(FOR NORWAY & EU).................................................................................................................................................................................................. 893 CONTENTS................................................................................................................................................................................................................... 894 GENERAL.................................................................................................................................................................................................................... 895 SPECIFICATION DIMENSIONS DRAWING....................................................................................................................................................................................... 895 WORKING RANGE DRAWING.................................................................................................................................................................................................. 896 SPECIFICATIONS......................................................................................................................................................................................................... 897 WEIGHT TABLE........................................................................................................................................................................................................... 903 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD............................................................................................................................................................................... 905 ARRANGEMENT OF HYDRAULIC COMPONENTS.................................................................................................................................................................................... 905 SOLENOID VALVE......................................................................................................................................................................................................... 907 ACCUMULATOR FOR PPC.................................................................................................................................................................................................... 911 DIMENSIONS OF EACH PART OF WORK EQUIPMENT.............................................................................................................................................................................. 912 BOOM HYDRAULIC ANTI-BURST VALVE........................................................................................................................................................................................ 914 ELECTRIC CONTROL SYSTEM................................................................................................................................................................................................ 920 GENERAL SYSTEM DIAGRAM................................................................................................................................................................................................. 921 OVERLOAD ALARM FUNCTION................................................................................................................................................................................................ 927 OVERLOAD ALARM PRESSURE SENSOR......................................................................................................................................................................................... 928 METER DISPLAY UNIT..................................................................................................................................................................................................... 929 TROUBLESHOOTING............................................................................................................................................................................................................ 930 CONNECTOR TYPES AND MOUNTING LOCATIONS................................................................................................................................................................................. 930 CONNECTOR ARRANGEMENT DIAGRAM.......................................................................................................................................................................................... 932 EXPLANATION OF FUNCTIONS OF ELECTRIC SYSTEM CONTROL MECHANISM.......................................................................................................................................................... 945 DISPLAY AND SPECIAL FUNCTIONS OF MONITOR PANEL......................................................................................................................................................................... 947 TROUBLESHOOTING FOR CONTROLLER PUMP CONTROL SYSTEM(C MODE)............................................................................................................................................................. 955 PRECAUTIONS FOR TROUBLESHOOTING FOR CONTROLLER (PUMP CONTROL SYSTEM)............................................................................................................................................... 956 ACTION TAKEN BY CONTROLLER WHEN TROUBLE OCCURS AND PROBLEMS ON MACHINE............................................................................................................................................. 957 JUDGEMENT TABLE FOR CONTROLLER (PUMP CONTROL SYSTEM) AND HYDRAULIC EQUIPMENT....................................................................................................................................... 961 ELECTRIC CIRCUIT DIAGRAM OF C MODE SYSTEM.......................................................................................................................................................................... 965 C-1 [E232], C-2 [E233] TROUBLE IN TVC-EPC SOLENOID SYSTEM.......................................................................................................................................................... 968 C-3 [E203], C-4 [E213] TROUBLE IN SWING HOLDING BRAKE SOLENOID SYSTEM.............................................................................................................................................. 970 C-5 [E206], C-6 [216] TROUBLE IN 2ND TRAVEL SPEED SELECTION SOLENOID SYSTEM........................................................................................................................................ 972 C-7 [E251] TROUBLE IN BOOM BOTTOM PRESSURE SENSOR (OVERLOAD SENSOR) SYSTEM......................................................................................................................................... 974 C-8 [E258] SHORT CIRCUIT IN 5 V SYSTEM OF SENSOR POWER SUPPLY ..................................................................................................................................................... 976 C-9 WORK EQUIPMENT STILL MOVES AFTER WORK EQUIPMENT LOCK LEVER IS SET TO LOCK...................................................................................................................................... 979 C-10 MACHINE DOES NOT SWING........................................................................................................................................................................................ 982 C-11 TRAVEL SPEED DOES NOT RISE.................................................................................................................................................................................... 984 C-12 GEAR SPEED DOES NOT CHANGE AUTOMATICALLY...................................................................................................................................................................... 985 C-13 TROUBLE IN CONTROLLER POWER SUPPLY (LED OF CONTROLLER IS TURNED OFF).......................................................................................................................................... 985 TROUBLESHOOTING FOR MACHINE MONITOR SYSTEM (M MODE).................................................................................................................................................................... 986 ELECTRIC CIRCUIT DIAGRAM OF M MODE SYSTEM.......................................................................................................................................................................... 987 M-11 WHEN STARTING SWITCH IS SET TO ON POSITION AND ENGINE IS STARTED,BASIC CHECK ITEMS FLASH...................................................................................................................... 993 a) ALTERNATOR SYSTEM........................................................................................................................................................................................... 993 b) ENGINE OIL PRESSURE SYSTEM.................................................................................................................................................................................. 995 M-12 WHEN STARTING SWITCH IS SET TO ON POSITION (BUT ENGINE IS STOPPED), CAUTION ITEMS AND EMERGENCY STOP ITEMS (EXCLUDING BATTERY AND ENGINE OIL) FLASH........................................................... 997 a) ALTERNATOR SYSTEM........................................................................................................................................................................................... 997 b) ENGINE OIL PRESSURE SENSOR SYSTEM........................................................................................................................................................................... 999 90 OTHERS......................................................................................................................................................................................................................1001 HYDRAULIC CIRCUIT DIAGRAM..................................................................................................................................................................................................1002 PC78US-6 SERIAL NO.:4001-6500 (BLADE-LESS SPECIFICATION)...............................................................................................................................................................1002 PC78US-6 SERIAL NO.:6501 AND UP (BLADE-LESS SPECIFICATION).............................................................................................................................................................1004 PC78US-6 (ADDITIONAL ATTACHMENT CIRCUIT)...............................................................................................................................................................................1003 PC78US-6 SERIAL NO.:4001-6500 (BLADE SPECIFICATION)....................................................................................................................................................................1005 PC78US-6 SERIAL NO.:6501 AND UP (BLADE SPECIFICATION)..................................................................................................................................................................1006 PC78US-6 SERIAL NO.:4809-6500 (NORWAY & EU SPECIFICATION)..............................................................................................................................................................1007 PC78US-6 SERIAL NO.:6501 AND UP (NORWAY & EU SPECIFICATION)............................................................................................................................................................1008 PC78UU-6...............................................................................................................................................................................................................1009 ELECTRICAL CIRCUIT DIAGRAM.................................................................................................................................................................................................1010 PC78US-6 SERIAL NO.:4001-5500 (1/2)....................................................................................................................................................................................1010 PC78US-6 SERIAL NO.:4001-5500 (2/2)....................................................................................................................................................................................1011 PC78US-6 SERIAL NO.:5501-6500 (1/2)....................................................................................................................................................................................1012 PC78US-6 SERIAL NO.:5501-6500 (2/2)....................................................................................................................................................................................1013 PC78US-6 SERIAL NO.:6501 AND UP (1/2)..................................................................................................................................................................................1014 PC78US-6 SERIAL NO.:6501 AND UP (2/2)..................................................................................................................................................................................1015 PC78US-6 SERIAL NO.:4809-5500(NORWAY & EU SPECIFICATION) (1/2).........................................................................................................................................................1016 PC78US-6 SERIAL NO.:4809-5500(NORWAY & EU SPECIFICATION) (2/2).........................................................................................................................................................1017 PC78US-6 SERIAL NO.:5501-6500(NORWAY & EU SPECIFICATION) (1/2).........................................................................................................................................................1018 PC78US-6 SERIAL NO.:5501-6500(NORWAY & EU SPECIFICATION) (2/2).........................................................................................................................................................1019 PC78US-6 SERIAL NO.:6501 AND UP(NORWAY & EU SPECIFICATION) (1/2).......................................................................................................................................................1020 PC78US-6 SERIAL NO.:6501 AND UP(NORWAY & EU SPECIFICATION) (2/2).......................................................................................................................................................1021 PC78UU-6 SERIAL NO.:22832-23500(1/2)...................................................................................................................................................................................1022 PC78UU-6 SERIAL NO.:22832-23500(2/2)...................................................................................................................................................................................1023 PC78UU-6 SERIAL NO.:23501 AND UP (1/2).................................................................................................................................................................................1024 PC78UU-6 SERIAL NO.:23501 AND UP (2/2).................................................................................................................................................................................1025
KOMATSU PC78UU-6, PC78US-6 EXCAVATOR SHOP MANUAL 22832, 4001, 4809 AND UP ( FOR NORWAY & EU ) – PDF DOWNLOAD:
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