Komatsu PC50UU-2 Excavator Shop Manual SEBM000906 PDF

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Komatsu PC50UU-2 Excavator Shop Manual SEBM000906 – PDF DOWNLOAD 

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Komatsu PC50UU-2 Excavator Shop Manual SEBM000906 – PDF DOWNLOAD 

Language : English
Pages : 757
Downloadable : Yes
File Type : PDF

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TABLE OF CONTENTS:

Komatsu PC50UU-2 Excavator Shop Manual SEBM000906 – PDF DOWNLOAD

MACHINE MODEL    SERIAL NUMBER
PC250-6                       10001 and up
PC250LC-6                  10001 and up

COVER 1
CONTENTS 2
01 GENERAL 27
GENERAL ASSEMBLY DRAWING 28
SPECIFICATIONS 32
WEIGHT TABLE 38
LIST OF LUBRICANT AND WATER 42
10 STRUCTURE AND FUNCTION 44
POWER TRAIN SYSTEM 45
PTO 46
SWING MACHINERY 48
SWING CIRCLE 51
TRACK FRAME 52
HYDRAULIC PIPING DIAGRAM 57
HYDRAULIC TANK 61
MAIN PUMP 62
5-SPOOL CONTROL VALVE 66
6-SPOOL CONTROL VALAE 68
4-SPOOL CONTROL VALVE 70
5-SPOOL CONTROL VALVE 76
SWING MOTOR 80
CENTER SWIVEL JOINT 93
TRAVEL MOTOR 96
VALVE CONTROL 106
PPC VALVE 108
SOLENOID VALVE, EPC VALVE 118
WORK EQUIPMENT 126
ELECTRIC WIRING DIAGRAM 128
FOUR SYSTEM (4 SYSTEM) 137
MACHINE MONITOR SYSTEM 155
FUEL CONTROL (ONE-TOUCH DECELERATION SYSTEM) 161
20 TESTING AND ADJUSTING 164
TABLE OF JUDGEMENT STANDARD VALUE 165
STANDARD VALUE TABLE FOR ELECTRICAL PARTS 181
TOOLS FOR TESTING,ADJUSTING,AND TROUBLESHOOTING 186
MEASURING ENGING SPEED 187
MEASURING ENGINE OIL PRESSURE 188
MEASURING COMPRESSION PRESSURE 189
ADJUSTING VALVE CLEARANCE 190
ADJUSTING FUEL INJECTION TIMING 191
TESTING AND ADJUSTING ALTERNATOR FAN BELT TENSION 192
ADJUSTING FUEL CONTROL LEVER 193
ADJUSTING THE FUEL CONTROL LINKAGE 195
TESTING AND ADJUSTING TRACK SHOE TENSION 197
TESTING WEAR OF SPROCKET 198
TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EQUIPMENT, SWING, TRAVEL CIRCUIT 199
TESTING CONTROL CIRCUIT PRESSURE 204
MEASURING OUTPUT PRESSURE OF PPC VALVE 206
ADJUSTING PPC VALVE 207
MEASURING OUTLET PORT PRESSURE OF SOLENOID VALVE, EPC VALVE 208
MEASURING OIL LEAKAGE INSIDE CYLINDER 210
TESTING TRAVEL DEVIATION 211
MEASURING OIL LEAKAGE FROM SWING, TRAVEL MOTOR 212
BLEEDING AIR 214
RELEASING REMAINING FROM HYDRAULIC CIRCUIT 216
ADJUSTING BLADE CONTROL LEVER 217
ADJUSTING TRAVEL CONTROL LEVER 218
PROCEDURE FOR RESETTING ELECTRICAL SYSTEM INPUT/OUTPUT SIGNALS AND CHECKING OPERATION 219
PROCEDURE FOR ADJUSTING WHEN INSTALLING LONG ARM, SLIDE ARM 254
PROCEDURE FOR PEPLACING POTENTIOMETER 255
PROCEDURE FOR CHECKING DIODE 257
TROUBLESHOOTING 258
POINTS TO REMEMBER WHEN TROUBLESHOOTING 259
SEQUENCE OF EVENTS IN TROUBLESHOOTING 260
POINTS TO REMENBER WHEN CARRYING OUT MAINTENANCE 261
CHECKS BEFORE TROUBLESHOOTING 269
ELECTRICAL CIRCUIT DIAGRAMS FOR EACH SYSTEM 270
CONNECTOR TYPES AND MOUNTING LOCATIONS 280
CONNECTOR ARRANGEMENT DRAWING 282
CONNECTION TABLE FOR CONNECTOR PIN NUMBERS 295
EXPLANATIONS OF CONTROL MECHANISM OF ELECTRICAL SYSTEM 305
DISPLAY METHOD FOR MONITOR PANEL,CONTROLLER 310
ACTION TAKEN BY SELF-DIAGNOSTIC FUNCTION AND PROBLEMS ON MACHINE 316
METHOD OF USING JUDGEMENT TABLE 318
METHOD OF USING TROUBLESHOOTING CHARTS 319
TROUBLESHOOTING OF CONTROLLER, ELECTRICAL SYSTEM (E MODE) 321
JUDGEMENT TABLE FOR CONTROLLER, ELECTRICAL, HYDRAULIC AND MECHANICAL SYSTEMS 322
POINTS TO REMEMBER WHEN CARRYING OUT TROUBLESHOOTING OF CONTROLLER SYSTEM 324
PRECAUTIONS WHEN HANDLING CANCEL SWITCH WHEN ABNORMALITY DISPLAY IS GIVEN AND WORK EQUIPMENT STOPS 327
E-1 ERROR CODE [EE](ABNORMALITY IN CONTROLLER POWER SOURCE SYSTEM OR COMMUNICATIONS SYSTEM) 328
a) ABNORMALITY IN CONTROLLER POWER SOURCE SYSTEM 328
b) ABNORMALITY IN COMMUNICATIONS SYSTEM 329
E-2 ERROR CODE [21] (ABNORMALITY IN MODEL SELECTION SYSTEM) 330
E-3 ERROR CODE [22] (ABNORMALITY IN WORK EQUIPMENT SELECTION SYSTEM) 331
E-4 ERROR CODE [31] (ABNORMALITY IN BOOM POTENTIOMETER SYSTEM) 332
E-5 ERROR CODE [32] (ABNORMALITY IN ARM POTENTIOMETER SYSTEM) 333
E-6 ERROR CODE [34] (ABNORMALITY IN OFFSET POTENTIOMETER SYSTEM) 335
E-7 ERROR CODE [38] (ABNORMALITY IN SLIDE ARM LENGTH SENSOR SYSTEM) 337
E-8 ERROR CODE [41] (ABNORMALITY IN PPC LOCK SOLENOID SYSTEM) 338
E-9 ERROR CODE [42] (ABNORMALITY IN LEFT OFFSET STOP SOLENDOID SYSTEM) 340
E-10 ERROR CODE [44] (ABNORMALITY IN BOOM LOWER STOP SOLENOID SYSTEM0 342
E-11 ERROR CODE [51] (ABNORMALITY IN BOOM RAISE STOP SOLENOID SYSTEM0 344
E-12 ERROR CODE [52] (ABNORMALITY IN ARM IN STOP SOLENOID SYSTEM) 346
E-13 WORK EQUIPMENT DOES NOT WORK EVEN WHEN WORK EQUIPMENT LOCK LEVER IS RELEASED 348
E-14 DEPTH MODE,HEIGHT MODE,OFFSET MODE DO NOT WORK PROPERLY (GO BEYOND SET POSITION BEFORE STOPPING OR STOP BEFORE REACHING SET POSITION) 350
E-15 IMPOSSIBLE TO SELECT AND SET DEPTH DISPLY O SET MODE,DEPTH MODE,HEIGHT MODE, OFFSET MODE 353
E-16 CANCEL SWITCH IS NOT TURNED ON, BUT ALARM BUZZER SOUNDS FOR 7 SECONDS AND ELECTRIC SYSTEM CAUTION LAMP FLASHES 354
E-17 AUTOMATIC STOP IS NOT CARRIED OUT FOR BOOM RAISE,ARM IN, LEFT OFFSET(WHEN ERROR CODE [61] IS NOT DISPLAYED) 355
a) ALL OPERATIONS STOP IMMEDIATELY BEFORE INTERFERENCE 355
b) THERE IS INTERFERENCE 355
E-18 WORK EQUIPMENT LOCK LEVER IS AT LOCK POSITION BUT WORK EQUIPMENT MOVES 357
E-19 WHEN SLIDE ARM IS BEING EXTENDED (MORE THAN 200 MM) AUTOMATIC STOP DISTANCE IS CLOSE 359
E-20 WHEN SLIDE ARM IS BEING RETRACTED (LESS THAN 200 MM) AUTOMATIC STOP DISTANCE IS FAR 360
E-21 EVEN WHEN STARTING SWITCH IS TURNED TO START,ENGINE DOES NOT START 361
a) STARTING SYSTEM 361
b) ENGINE STOP SOLENOID SYSTEM 363
E-22 EVEN WHEN STARTING SWITCH IS TURNED OFF,ENGINE DOES NOT STOP 367
E-23 EVEN WHEN TRAVEL BOOST PEDAL IS OPERATED,SPEED DOES NOT INCREASE 369
E-24 TRAVEL BOOST PEDAL IS NOT BEING OPERATED BUT SPEED REMAINS BOOSTED 371
E-25 DEFECTIVE ENGINE CONTROL 373
a) DOES NOT WORK,OR WORKS AND THEN STOPS WORKING 373
b) WORKS,BUT DOES NOT WORK SMOOTHLY 375
c) SWIFT DECELERATION DOES NOT WORK 377
d) WORKS AT NEAR IDLING BUT DOES NOT WORK UP TO FULL (LOAD BECOMES LARGER) 378
TROUBLESHOOTING OF HYDRAULIC,MECHANICAL SYSTEM (H MODE) 379
TABLE OF FAILURE MODES AND CAUSES 380
H-1 SPEEDS OF ALL WORK EQUIPMENT,SWING,TRAVEL ARE SLOW 382
a) SPEEDS OF ALL WORK EQUIPMENT AND SWING ARE SLOW (WHEN BLADE AND TRAVEL SPEEDS ARE NORMAL) 382
b) SPEEDS OF ALL WORK EQUIPMENT,SWING,TRAVEL ARE ALL SLOW 383
a) SYSTEM CONTROLLED BY PPC VALVE (WORK EQUIPMENT, SWING,OFFSET) 384
b) SYSTEM OPERATED BY PISTON PUMP 385
c) SYSTEM OPERATED BY GEAR PUMP 385
H-2 THERE IS EXCESSIVE DROP IN ENGINE SPEED,OR ENGINE STALLS 386
H-3 NO WORK EQUIPMENT,SWING,TRAVEL MOVE 388
a) NONE OF WORK EQUIPMENT AND SWING MOVE 388
b) NONE OF WORK EQUIPMENT,SWING,TRAVEL MOVE 388
a) SYSTEM CONTROLLED BY PPC VALVE (WORK EQUIPMENT,SWING,OFFSET) 389
b) WHEN NO SYSTEMS WORK 389
c) SYSTEM OPERATED BY GEAR PUMP 389
H-4 ALL WORK EQUIPMENT,SWING,TRAVEL LACK POWER 390
H-5 ABNORMAL NOISE GENERATED FROM AROUND PUMP 390
H-6 WORK EQUIPMENT SPEED IS SLOW (ONE OF BOOM,ARM,BUCKET,OFFSET IS SLOW) 391
H-7 WORK EQUIPMENT LACKS POWER (ONE OF BOOM,ARM,BUCKET,OFFSET LACKS POWER) 392
H-8 WORK EQUIPMENT DOES NOT MOVE(ONE OF BOOM,ARM,BUCKET,OFFSET DOES NOT MOVE) 392
H-9 EXCESSIVE HYDRAULIC DRIFT 393
H-10 EXCESSIVE TIME LAG 393
H-11 WHEN MACHINE IS TRAVELING,IT DEVIATES NATURALLY TO ONE SIDE 394
a) DEVIATES IN SAME DIRECTION BOTH IN FORWARD AND REVERSE 394
b) DEVIATES IN DIFFERENT DIRECTION IN FORWARD AND REVERSE (SEE FIG 1) 396
H-12 EXCESSIVE DEVIATION WHEN STARTING 397
H-13 TRAVEL LACKS POWER (OR SPEED IS SLOW) 397
H-14 TRAVEL SPEED IS NOT BOOSTED 398
H-15 TRACK DOES NOT MOVE(ONE SIDE ONLY) 398
H-16 TRAVEL LEVER IS HEAVY 399
H-17 DOES NOT SWING 400
H-18 SWING SPEED IS SLOW OR ACCELERATION IS POOR 402
H-19 EXCESSIVE OVERRUN WHEN STOPPING SWING 402
H-20 EXCESSIVE SHOCK WHEN STOPPING SWING 403
H-21 EXCESSIVE ABNORMAL NOISE WHEN STOPPING SWING 403
H-22 EXCESSIVE HYDRAULIC DRIFT OF SWING 404
H-23 ERROR CODE [61] IS DISPLAYED ON MONITOR PANEL,AND JUST BEFORE INTERFERENCE,BOOM RAISE, ARM IN,AND LEFT OFFSET ALL STOP 405
H-24 BOOM RAISE,ARM IN, AND LEFT OFFSET DO NOT AUTOMATICALLY STOP AND THERE IS INTERFERENCE 407
TROUBLESHOOTING OF MACHINE MONITOR SYSTEM(M MODE) 408
M-1 WHEN THE STARTING SWITCH IS TURNED ON, NO DISPLAY IS GIVEN (LAMPS DO NOT LIGHT UP FOR 3 SECONDS) 409
M-2 WHEN STARTING SWITCH IS TURNED ON,LAMPS LIGHT UP FOR 3SECONDS,BUT THEN DO NOT GO OUT 409
M-3 WHEN STARTING SWITCH IS TURNED ON, SOME LAMPS DO NOT LIGHT UP FOR 3 SECONDS 410
a) NO GAUGE LAMPS LIGHT UP PREHEATING PILOT DOES NOT LIGHT UP 410
b) BATTERY ELECTROLYTE LEVEL CAUTION LAMP DOES NOT LIGHT UP ELECTRIC SYSTEM CAUTION LAMP DOES NOT LIGHT UP 410
c) CHARGE CAUTION LAMP DOES NOT LIGHT UP 410
d) ENGINE OIL PRESSURE CAUTION LAMP DOES NOT LIGHT UP 410
M-4 WHEN STARTING SWITCH IS ON (ENGINE STOPPED),CHARGE CAUTION LAMP DOES NOT LIGHT UP 411
M-5 WHEN STARTING SWITCH IS ON (ENGINE STOPPED),ENGINE OIL PRESSURE CAUTION LAMP DOES NOT LIGHT UP 411
M-6 DURING PREHEATING,PREHEATING PILOT LAMP DOES NOT LIGHT UP 412
M-7 WHEN STARTING SWITCH IS ON (ENGINE STOPPED),BATTERY ELECTROLYTE LEVEL CAUTION LAMP LIGHTS UP (BATTERY ELECTROLYTE IS AT SPECIFIED LEVEL) 412
M-8 WHEN ENGINE IS RUNNING,ENGINE OIL PRESSURE CAUTION LAMP LIGHTS UP (ENGINE OIL PRESSURE IS NORMAL) 413
M-9 WHEN ENGINE IS RUNNING,CHARGE CAUTION LAMP LIGHTS UP 413
M-10 ABNORMALITY DISPLAY ON COOLANT TEMPERATURE GAUGE 414
a) AFTER ENGINE IS STARTED,LEVEL STAYS AT BOTTOM AND DOES NOT MOVE 414
b) AFTER ENGINE IS STARTED,LEVEL IMMEDIATELY RISES ENGINE IS NOT OVERHEATING BUT INDICATOR ENTERS RED RANGE 414
M-11 ABNORMALITY DISPLAY ON FUEL GAUGE 415
a) ALL FUEL GAUGE SEGMENTS GO OUT 415
b) EVEN WHEN FUEL LEVEL GOES DOWN,FUEL GAUGE CONTINUES TO SHOW FULL 415
c) EVEN WHEN TANK IS FILLED,FUEL GAUGE DOES NOT SHOW FULL 416
M-12 DEFECTIVE OPERATION OF ALARM BUZZER 417
a) BUAAER DOES NOT SOUND 417
b) BUZZER CONTINUES TO SOUND AND DOES NOT STOP 417
M-13 WHEN ENGINE IS RUNNING,SERVICE METER DOES NOT ADVANCE 418
a) WHEN CHARGE CAUTION LAMP DOES NOT LIGHT UP 418
b) WHEN CHARGE CAUTION LAMP LIGHTS UP 418
M-14 NIGHT LIGHTING DOES NOT LIGHT UP 419
a) LIGHTING OF COOLANT TEMPERATURE GAUGE,FUEL GAUGE,DEPTH DISPLAY DOES NOT LIGHT UP 419
b) LIGHTING OF SERVICE METER DOES NOT LIGHT UP 419
M-15 ELECTRIC SYSTEM CAUTION LAMP STAYS LIGHTED UP,AND DOES NOT GO OUT(NO ABNORMALITY DISPLAY ON CONTROLLER,OPERATION IS NORMAL) 420
30 DISASSEMBLY AND ASSEMBLY 421
METHOD OF USING MANUAL 423
PRECAUTIONS WHEN CARRYING OUT OPERATION 424
SPECIAL TOOLS LIST 426
SKETCHES OF SPECIAL TOOLS 431
STARTING MOTOR 433
REMOVAL AND INSTALLATION 433
ALTERNATOR 434
REMOVAL AND INSTALLTION 434
FUEL INJECTION PUMP ASSEMBLY 435
REMOVAL 435
INSTALLATION 436
WATER PUMP 437
REMOVAL AND INSTALLATION 437
THERMOSTAT 439
REMOVAL AND INSTALLATION 439
NOZZLE HOLDER 440
REMOVAL AND INSTALLATION 440
CYLINDER HEAD 441
REMOVAL 441
INSTALLATION 442
DAMPER 443
REMOVAL AND INSTALLATION 443
RADIATOR AND HYDRAULIC OIL COOLER 444
REMOVAL AND INSTALLATION 444
HYDRAULIC OILCOOLER 445
REMOVAL AND INSTALLATION 445
ENGINE 446
REMOVAL 446
INSTALLATION 447
SWING CIRCLE 450
REMOVAL AND INSTALLATION 450
SWING MACHINERY AND SWING MOTOR 451
REMOVAL AND INSTALLATION 451
SWING MOTOR AND SWING MACHINERY 454
DISASSEMBLY 454
ASSEMBLY 456
SWING MOTOR 464
DISASSEMBLY 464
ASSEMBLY 469
REVOLVING FRAME 477
REMOVAL 477
INSTALLATION 478
COUNTERWEIGHT 479
REMOVAL AND INSTALLATION 479
SPROCKET 480
REMOVAL AND INSTALLATION 480
IDLER AND RECOIL SPRING 481
REMOVAL AND INSTALLATION 481
IDLER 482
REMOVAL AND INSTALLATION 482
DISASSEMBLY 483
ASSEMBLY 485
RECOIL SPRING 489
REMOVAL AND INSTALLATION 489
DISASSEMBLY 490
ASSEMBLY 491
CARRIER ROLLER 496
REMOVAL AND INSTALLATION 496
DISASSEMBLY AND ASSEMBLY 498
TRACK ROLLER 501
REMOVAL AND INSTALLATION 501
DISASSEMBLY 504
ASSEMBLY 506
RUBBER SHOE 512
REMOVAL AND INSTALLATION 512
STEEL SHOE 513
REMOVAL AND INSTALLATION 513
MAIN PUMP 514
REMOVAL AND INSTALLATION 514
DISASSEMBLY 515
ASSEMBLY 518
PPC PUMP 521
REMOVAL AND INSTALLATION 521
4-SPOOL CONTROL VALVE 522
REMOVAL AND INSTALLATION 522
DISASSEMBLY 523
ASSEMBLY 525
MAIN RELIFE VALVE FOR 4-SPOOL CONTROL VALVE 527
REMOVAL AND INSTALLATION 527
DISASSEMBLY AND ASSEMBLY 528
5-SPOOL CONTROL VALVE 529
REMOVAL AND INSTALLATION 529
MAIN RELIEF VALVE FOR 5-SPOOL CONTROL VALVE 530
REMOVAL AND INSTALLATION 530
LEFT WORK EQUIPMENT PPC VALVE 531
REMOVAL AND INSTALLATION 531
RIGHT WORK EQUIPMENT PPC VALVE 532
REMOVAL AND INSTALLATION 532
WORK EQUIPMENT PPC VALVE 533
DISASSEMBLY 533
ASSEMBLY 534
OFFSET PPC VALVE 535
REMOVAL AND INSTALLATION 535
SWING MOTOR 536
REMOVAL AND INSTALLATION 536
TRAVEL MOTOR 538
REMOVAL AND INSTALLATION 538
GM05VL SERIAL NO 8001-14992 539
DISASSEMBLY AND ASSEMBLY 539
SAFETY 540
SECTIONAL DRAWING OF ASSEMBLY 541
PARTS LIST 543
TOOLS 544
TIGHTENING TORQUE 550
DISASSEMBLY 551
MAINTENANCE STANDARDS TABLE 573
ASSEMBLY 575
DIMENSIONS TABLE OF CLEARANCE ADJUSTMENT PARTS 601
PERFORMANCE CONFIRMATION TEST 602
SEALING KITS LIST 603
GM06VL SERIAL NO 14993 AND UP 604
DISASSEMBLY AND ASSEMBLY 604
SAFETY 605
SECTIONAL DRAWING OF ASSEMBLY 606
PARTS LIST 608
TOOLS 609
TIGHTENING TORQUE 616
DISASSEMBLY 617
MAINTENANCE STANDARDS TABLE 639
ASSEMBLY 641
DIMENSIONS TABLE OF CLEARANCE ADJUSTMENT PARTS 667
PERFORMANCE CONFIRMATION TEST 668
CENTER SWIVEL JOINT 669
REMOVAL 669
INSTALLATION 670
DISASSEMBLY AND ASSEMBLY 673
BOOM CYLINDER 675
REMOVAL 675
INSTALLATION 676
ARM CYLINDER 677
REMOVAL 677
INSTALLATION 678
BUCKET CYLINDER 681
REMOVAL 681
INSTALLATION 682
OFFSET CYLINDER 683
REMOVAL 683
INSTALLATION 684
BLADE CYLINDER 685
REMOVAL 685
INSTALLATION 686
HYDRAULIC CYLINDER 687
DISASSEMBLY 687
ASSEMBLY 689
1ST BOOM 692
REMOVAL 692
INSTALLATION 693
2ND BOOM 694
REMOVAL 694
INSTALLATION 695
BUCKET AND ARM 697
REMOVAL 697
INSTALLATION 698
ARM 699
REMOVAL 699
INSTALLATION 700
BUCKET 701
REMOVAL AND INSTALLATION 701
WORK EQUIPMENT 702
REMOVAL 702
INSTALLATION 703
BLADE 704
REMOVAL AND INSTALLATION 704
OPERATOR’S CAB 705
REMOVAL AND INSTALLATION 705
FLOOR FRAME 706
REMOVAL 706
INSTALLATION 707
FUEL TANK 708
REMOVAL AND INSTALLATION 708
CONTROLLER 709
REMOVAL AND INSTALLATION 709
MONITOR 710
REMOVAL AND INSTALLATION 710
40 MAINTENANCE STANDARD 711
SWING MACHINERY 712
SWING CIRCLE 715
TRACK FRAME,RECOIL SPRING 716
IDLER 721
TRACK ROLLER 725
CARRIER ROLLER 729
SPROCKET 732
TRACK SHOE 734
HYDRAULIC PUMP 737
5-SPOOL CONTROL VALVE 740
6-SPOOL CONTROL VALVE 741
4-SPOOL CONTROL VALVE 742
5-SPOOL CONTROL VALVE 748
SWING MOTOR 752
CENTER SWIVEL JOINT 755
PPC VALVE 758
HYDRAULIC CYLINDER 761
WORK EQUIPMENT 765
90 OTHERS 767
HYDRAULIC CIRCUIT DIAGRAM(SERIAL NO :8001-12771) 768
HYDRAULIC CIRCUIT DIAGRAM(SERIAL NO :12772-14992) 769
HYDRAULIC CIRCUIT DIAGRAM(SERIAL NO :14993 AND UP) 770
ELECTRIC CIRCUIT DIADRAM(SERIAL NO :8001-8585) 771
ELECTRIC CIRCUIT DIAGRAM(SERIAL NO :8586-12771) 772
ELECTRIC CIRCUIT DIAGRAM(SERIAL NO :12772-14992) 773
ELECTRIC CIRCUIT DIAGRAM(SERIAL NO :14993 AND UP) 774

DESCRIPTION:

Komatsu PC50UU-2 Excavator Shop Manual SEBM000906 – PDF DOWNLOAD 

MACHINE MODEL    SERIAL NUMBER
PC250-6                       10001 and up
PC250LC-6                  10001 and up

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.

S.V 24/12/24