Komatsu PC270LC-6LE Hydraulic Excavator Shop Manual CEBD003001 – PDF DOWNLOAD

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Komatsu PC270LC-6LE Hydraulic Excavator Shop Manual CEBD003001 – PDF DOWNLOAD

FILE DETAILS:

Komatsu PC270LC-6LE Hydraulic Excavator Shop Manual CEBD003001 – PDF DOWNLOAD

Language : English
Pages : 731
Downloadable : Yes
File Type : PDF

IMAGES PREVIEW OF THE MANUAL:

TABLE OF CONTENTS:

Komatsu PC270LC-6LE Hydraulic Excavator Shop Manual CEBD003001 – PDF DOWNLOAD

• MACHINE MODEL SERIAL NUMBERS
  PC270LC-6LE          A83001 and up

MAIN MENU 0
COVER 1
CONTENTS 2
00 FOREWORD 9
SAFETY 12
GENERAL 14
HOW TO READ THE SHOP MANUAL 15
HOISTING INSTRUCTIONS 16
COATING MATERIALS 17
STANDARD TIGHTENING TORQUE 18
ELECTRIC WIRE CODE 20
CONVERSION TABLES 21
01 GENERAL 27
GENERAL ASSEMBLY DRAWING 28
SPECIFICATIONS 29
WEIGHT TABLE 32
FUEL, COOLANT AND LUBRICANTS 34
ENGINE OIL SPECIFICATIONS 35
NORMAL OPERATION 35
ARCTIC OPERATION 35
DAMPER CASE, SWING MACHINERY CASE, TRACK FRONT IDLERS, TRACK ROLLERS, TOP CARRIER ROLLERS AND HYDRAULIC SYSTEM OIL SPECIFICATION 36
FINAL DRIVE OIL SPECIFICATIONS 36
DIESEL FUEL SPECIFICATIONS 36
COOLANT SPECIFICATIONS 37
GENERAL 37
WATER 37
ANTIFREEZE 37
10 STRUCTURE AND FUNCTION 39
ENGINE RELATED PARTS 42
RADIATOR AND OIL COOLER 43
POWER TRAIN 44
FINAL DRIVE 45
SWING CIRCLE 47
SWING MACHINERY 49
TRACK FRAME AND RECOIL SPRING 50
TRACK SHOE 51
HYDRAULIC PIPING DRAWING 53
HYDRAULIC CIRCUIT DIAGRAM 55
HYDRAULIC TANK 57
HYDRAULIC PUMP 58
BASIC PUMP 58
LS (LOADING SENSING) AND PC (POWER CONTROL) VALVE 64
IN-LINE OIL FILTER 76
CONTROL VALVE 77
OUTLINE 77
NINE-SPOOL VALVE (STANDARD PLUS THREE SERVICE VALVES) 78
MAIN STRUCTURE 79
SIX-SPOOL VALVE (STANDARD) 82
SAFETY-SUCTION VALVE FOR SERVICE VALVE 83
SELF-REDUCING PRESSURE VALVE 83
FUNCTION 86
OPERATION 86
CLSS 89
OUTLINE OF CLSS 89
OPERATION OF EACH FUNCTION AND VALVE 92
OPERATION OF CLSS SYSTEM AS A WHOLE 118
SWING MOTOR 134
BASIC MOTOR 134
SWING LOCK VALVE 136
RELIEF VALVE PORTION 137
REVERSE PREVENTION VALVE (SWING DAMPENING) 138
CENTER SWIVEL JOINT 140
TRAVEL MOTOR 141
VALVE CONTROL 149
WORK EQUIPMENT AND SWING PPC VALVE 150
OPERATION 152
TRAVEL PPC VALVE 154
OPERATION 156
SERVICE PPC VALVE 158
OPERATION 158
SAFETY LOCK VALVE 160
STRAIGHT-TRAVEL SYSTEM 161
FUNCTION 161
EPC VALVE 162
OPERATION 163
BOOM LOCK VALVE 164
OPERATION 165
ADDITIONAL FILTER FOR BREAKER 167
WORK EQUIPMENT 168
AIR CONDITIONER 169
BASIC INFORMATION ON AIR CONDITIONERS 170
UNITS RELATED TO REFRIGERATION 170
PRINCIPLE OF COOLING 174
REFRIGERANTS 179
SAFETY PRECAUTIONS 179
REFRIGERATOR OIL (LUBE OIL) 179
AIR CONDITIONING CONDENSER 181
FUNCTION 181
GENERAL DESCRIPTION 181
AIR CONDITIONER COMPRESSOR 184
RECEIVER WITH SIGHT GLASS 185
AIR CONDITIONER UNIT 187
OUTLINE 187
ELECTRICAL WIRING DIAGRAM 189
ELECTRICAL CIRCUIT DIAGRAM 191
ENGINE CONTROL SYSTEM 195
FUNCTION 195
OPERATION OF SYSTEM 196
COMPONENTS OF SYSTEM 197
ELECTRONIC CONTROL SYSTEM 201
TOTAL SYSTEM DIAGRAM 202
PUMP AND ENGINE MUTUAL CONTROL FUNCTION 203
PUMP AND VALVE CONTROL FUNCTION 208
POWER MAXIMIZING AND SWIFT SLOW-DOWN FUNCTION 211
AUTO-DECELERATION FUNCTION 212
AUTOMATIC WARMING-UP AND ENGINE OVERHEAT PREVENTION FUNCTION 214
SWING CONTROL FUNCTION 216
TRAVEL CONTROL FUNCTIONACTIVE MODE FUNCTION 218
ACTIVE MODE FUNCTION 220
COMPONENTS OF SYSTEM 222
MACHINE MONITOR SYSTEM 225
FUNCTION 225
MONITOR PANEL 226
MONITOR DISPLAY 227
OIL MAINTENANCE FUNCTION 229
SWITCHES 231
SENSORS 232
COOLANT LEVEL SENSOR 232
ENGINE OIL LEVEL SENSOR 233
HYDRAULIC OIL SENSOR 233
ENGINE OIL PRESSURE SENSOR 233
COOLANT TEMPERATURE SENSOR 234
FUEL LEVEL SENSOR 234
AIR CLEANER CLOGGING SENSOR 234
20 TESTING, ADJUSTING AND TROUBLESHOOTING 235
TESTING AND ADJUSTING 240
STANDARD VALUES TABLE 241
FOR ENGINE – PC270LC-6LE 241
FOR CHASSIS 242
TOOLS FOR TESTING, ADJUSTING AND TROUBLESHOOTING 261
MEASURING ENGINE SPEED 262
MEASURING EXHAUST GAS COLOR 263
ADJUSTING VALVE CLEARANCE 264
MEASURING COMPRESSION PRESSURE 265
MEASURING BLOW-BY PRESSURE 266
TESTING AND ADJUSTING FUEL INJECTION TIMING 267
MEASURING ENGINE OIL PRESSURE 268
TESTING AND ADJUSTING FAN BELT TENSION 269
TESTING AND ADJUSTING A/C COMPRESSOR BELT TENSION 270
ADJUSTING THE ENGINE SPEED SENSOR 271
TESTING AND ADJUSTING GOVERNOR MOTOR LEVER STROKE 272
MEASURING EQUIPMENT CYCLE TIMES 273
TESTING AND ADJUSTING PILOT OIL PRESSURE 274
TESTING AND ADJUSTING MAIN HYDRAULIC PRESSURE IN WORK EQUIPMENT, SWING, AND TRAVEL CIRCUIT 276
TESTING SERVO PISTON INPUT PRESSURE 280
TESTING AND ADJUSTING LS DIFFERENTIAL PRESSURE 282
TESTING AND ADJUSTING PC VALVE 284
TESTING SOLENOID VALVE OUTPUT PRESSURES (LS-EPC, PC-EPC AND ON/OFF SOLENOID VALUES) 286
MEASURING PPC VALVE OUTPUT PRESSURE 290
PRESSURE SWITCH PIPING DIAGRAM 291
ADJUSTING WORK EQUIPMENT * SWING PPC VALVE 292
TESTING TRAVEL DEVIATION 293
TESTING LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT 294
MEASURING OIL LEAKAGE 296
RELEASING REMAINING PRESSURE IN HYDRAULIC CIRCUIT 298
TESTING CLEARANCE OF SWING CIRCLE BEARING 299
TESTING AND ADJUSTING TRACK SHOE TENSION 300
BLEEDING AIR 302
TROUBLESHOOTING 304
POINTS TO REMEMER WHEN TROUBLESHOOTING 305
SEQUENCE OF EVENTS IN TROUBLESHOOTING 306
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE 307
POINTS TO REMEMBER WHEN HANDLING ELECTRIC EQUIPMENT 307
POINTS TO REMEMBER WHEN TROUBLESHOOTING ELECTRIC CIRCUITS 312
POINTS TO REMEMBER WHEN HANDLING HYDRAULIC EQUIPMENT 313
CHECKS BEFORE TROUBLESHOOTING 315
CONNECTOR TYPES AND MOUNTING LOCATIONS 316
CONNECTION TABLE FOR CONNECTOR PIN NUMBERS 320
EXPLANATION OF CONTROL MECHANISM FOR ELECTRICAL SYSTEM 330
DISPLAY METHOD AND SPECIAL FUNCTIONS OF MONITOR PANEL 331
METHOD OF USING JUDGEMENT TABLE 340
METHOD OF USING TROUBLESHOOTING CHARTS 342
DETAILS OF TROUBLESHOOTING AND TROUBLESHOOTING PROCEDURE 344
SERVICE CODE TABLE 349
TROUBLESHOOTING OF COMMUNICATION ABNOMALITY SYSTEM (N MODE) 350
N-1 [E218] COMMUNICATIONS ABNORMALITY 350
TROUBLESHOOTING OF ENGINE THROTTLE – PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM)(E MODE) 353
POINTS TO REMEMBER WHEN CARRYING OUT TROUBLESHOOTING OF ENGINE THROTTLE – PUMP CONTROLLER SYSTEM 353
ACTION TAKEN BY CONTROLLER WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 354
JUDGEMENT TABLE FOR ENGINE THROTTLE – PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM) AND ENGINE RELATED PARTS 358
ELECTRICAL CIRCUIT DIAGRAM FOR E MODE SYSTEM 360
E-1 ABNOMALITY IN ENGINE THROTTLE – PUMP CONTROLLER POWER SOURCE (CONTROLLER LED IS OFF) 362
E-2 [E308] ABNORMALITY IN FUEL CONTROL DIAL INPUT VALUE IS DISPLAYED 363
E-3 [E317] ABNORMALITY (DISCONNECTION) IN MOTOR DRIVE SYSTEM IS DISPLAYED 364
E-4 [E318] ABNORMALITY (SHORT CIRCUIT) IN MOTOR DRIVE SYSTEM IS DISPLAYED 365
E-5 [E306] ABNORMALITY IN FEEDBACK POTENTIOMETER SYSTEM IS DISPLAYED 366
E-6 [E315] ABNORMALITY (SHORT CIRCUIT) IN BATTERY RELAY OUTPUT SYSTEM IS DISPLAYED 367
E-7 [E316] ABNORMALITY (STEP-OUT) IN MOTOR IS DISPLAYED 368
E-8 ENGINE DOES NOT START 370
E-9 ENGINE SPEED IS IRREGULAR 374
E-10 LACK OF OUTPUT (ENGINE HIGH IDLING SPEED TO LOW) 378
E-11 ENGINE DOES NOT STOP 380
E-12 DEFECTIVE OPERATION OF BATTERY RELAY SYSTEM (ENGINE DOE NOT STOP) 382
TROUBLESHOOTING OF ENGINE SYSTEM (S MODE) 384
METHOD OF USING TROUBLESHOOTING CHARTS 384
S-1 STARTING PERFORMANCE IS POOR (STARTING ALWAYS TAKES TIME) 388
S-2 ENGINE DOES NOT START 390
S-3 ENGINE DOES NOT PICK UP SMOOTHLY (FOLLOW-UP IS POOR) 393
S-4 ENGINE STOPS DURING OPERATIONS 394
S-5 ENGINE DOES NOT ROTATE SMOOTHLY (HUNTING) 395
S-6 ENGINE LACKS OUTPUT (NO POWER) 396
S-7 EXHAUST SMOKE IS BLACK (INCOMPLETE COMBUSTION) 397
S-8 OIL COMSUMPTION IS EXCESSIVE (OR EXHAUST SMOKE IS BLUE) 398
S-9 OIL BECOMES CONTAMINATED QUICKLY 399
S-10 FUEL CONSUMPTION IS EXCESSIVE 400
S-11 OIL IS IN COOLANT, OR COLLANT SPURTS BACK, OR COOLANT LEVLE GOES DOWN 401
S-12 OIL PRESSURE CAUTION LAMP LIGHTS UP (DROP IN OIL PRESSURE) 402
S-13 OIL LEVEL RISES (COOLANT, FUEL IN OIL) 403
S-14 COOLANT TEMPERATURE BECOMES TOO HIGH (OVERHEATING) 404
S-15 ABNORMAL NOISE IS MADE 405
S-16 VIBRATION IS EXCESSIVE 406
TROUBLESHOOTING OF ENGINE THROTTLE – PUMP CONTROLLER (PUMP CONTROL SYSTEM)(C MODE) 407
POINTS TO REMEMBER WHEN TROUBLESHOOTING PUMP CONTROLLER SYSTEM 407
ACTION TAKEN BY CONTROLLER WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 408
JUDGEMENT TABLE FOR ENGINE THROTTLE – PUMP CONTROLLER (PUMP CONTROL SYSTEM) AND HYDRAULIC RELATED PARTS 416
ELECTRICAL CIRCUIT DIAGRAM FOR C MODE AND F MODE 418
C-1 ABNORMALITY IN CONTROLLER POWER SOURCE SYSTEM (CONTROLLER LED IS OFF) 420
C-2 [E232] SHORT CIRCUIT IN PUMP EPC SOLENOID SYSTEM IS DISPLAYED 422
C-3 [E233] DISCONNECTION IN PC-EPC SOLENOID SYSTEM IS DISPLAYED 424
C-4 [E213] DISCONNECTION IN SWING HOLDING BRAKE SOLENOID SYSTEM IS DISPLAYED 426
C-5 [E203] SHORT CIRCUIT IN SWING HOLDING BRAKE SOLENOID SYSTEM IS DISPLAYED 428
C-6 [E204] SHORT CIRCUIT IN PUMP MERGE/DIVIDER SOLENOID SYSTEM IS DISPLAYED 430
C-7 [E214] DISCONNECTION IN PUMP MERGE/DIVIDER SOLENOID SYSTEM IS DISPLAYED 431
C-8 [E207] SHORT CIRCUIT IN ACTIVE MODE SOLENOID SYSTEM IS DISPLAYEDPC270LC-6LE 432
C-9 [E208] DISCONNECTION IN ACTIVE MODE SOLENOID SYSTEM IS DISPLAYED 433
C-10 [E206] SHORT CIRCUIT IN TRAVEL SPEED SOLENOID SYSTEM IS DISPLAYED 434
C-11 [E216] DISCONNECTION IN TRAVEL SPEED SELECTOR SOLENOID SYSTEM IS DISPLAYED 435
C-12 [E205] SHORT CIRCUIT IN 2-STAGE RELIEF SOLENOID SYSTEM IS DISPLAYED 436
C-13 [E215] DISCONNECTION IN 2-STAGE RELIEF SOLENOID SYSTEM IS DISPLAYED 437
C-14 [E217] MODEL SELECTION INPUT ERROR IS DISPLAYED 438
C-15 [E222] SHORT CIRCUIT IN LS-EPC SOLENOID SYSTEM IS DISPLAYED 440
C-16 [E223] DISCONNECTION IN LS-EPC SOLENOID SYSTEM IS DISPLAYED 441
C-17 [E224] ABNORMALITY IN FRONT PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 442
C-18 [E225] ABNORMALITY IN REAR PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 443
C-19 [E226] ABNORMALITY IN PRESSURE SENSOR POWER SOURCE SYSTEM IS DISPLAYED 444
C-20 [E227] ABNORMALITY IN ENGINE SPEED SENSOR SYSTEM IS DISPLAYED 445
TROUBLESHOOTING OF ENGINE THROTTLE – PUMP CONTROLLER (INPUT SIGNAL SYSTEM (F MODE) 447
F-1 BIT PATTERN 20-(1) SWING OIL PRESSURE SWITCH DOES NOT LIGHT UP 447
F-2 BIT PATTERN 20-(2) TRAVEL OIL PRESSURE SWITCH DOES NOT LIGHT UP 448
F-3 BIT PATTERN 20-(3) BOOM LOWER OIL PRESSURE SWITCH DOES NOT LIGHT UP 449
F-4 BIT PATTERN 20-(4) BOOM RAISE OIL PRESSURE SWITCH DOES NOT LIGHT UP 450
F-5 BIT PATTERN 20-(5) ARM IN OIL PRESSURE SWITCH DOES NOT LIGHT UP 451
F-6 BIT PATTERN 20-(6) ARM OUT OIL PRESSURE SWITCH DOES NOT LIGHT UP 452
F-7 BIT PATTERN 21-(1) BUCKET CURL OIL PRESSURE SWITCH DOES NOT LIGHT UP 453
F-8 BIT PATTERN 21-(2) BUCKET DUMP OIL PRESSURE SWITCH DOES NOT LIGHT UP 454
F-9 BIT PATTERN 21-(3) SWING LOCK SWITCH DOES NOT LIGHT UP 455
F-10 BIT PATTERN 22-(5) KEROSENE MODE CONNECTION DOES NOT LIGHT UP 456
F-11 BIT PATTERN 22-(6) L H KNOB SWITCH DOES NOT LIGHT UP 457
TROUBLESHOOTING OF HYDRAULIC AND MECHANICAL SYSTEM (H MODE) 458
TABLE OF FAILURE MODES AND CAUSES FOR HYDRAULIC AND MECHANICAL SYSTEM 458
PUMP MERGE/DIVIDER LOGIC 462
SOLENOID ACTUATION TABLE 463
H-1 SPEEDS OF ALL WORK EQUIPMENT, SWING, TRAVEL ARE SLOW 464
H-2 THERE IS EXCESSIVE DROP IN ENGINE SPEED, OR ENGINE STALLS 466
H-3 NO WORK EQUIPMENT, TRAVEL, SWING MOVE 466
H-4 ABNORMAL NOISE GENERATED (AROUND PUMP) 467
H-5 AUTO-DECELERATION DOES NOT WORK (PPC SHUTTLE VALVE IS EQUIPPED ONLY IN TRAVEL PPC VALVE) 467
H-6 FINE CONTROL ABILITY IS POOR OR RESPONSE IS POOR 468
H-7 BOOM IS SLOW OR LACKS POWER 470
H-8 ARM IS SLOW OR LACKS POWER 472
H-9 BUCKET IS SLOW OR LACKS POWER 474
H-10 WORK EQUIPMENT (BOOM, ARM, BUCKET) DOES NOT MOVE (BUT TRAVEL AND SWING ARE NORMAL) 475
H-11 EXCESSIVE HYDRAULIC DRIFT (BOOM, ARM, BUCKET) 475
H-12 EXCESSIVE TIME LAG (ENGINE AT LOW IDLING) 476
H-13 OTHER EQUIPMENT MOVES WHEN SINGLE CIRCUIT IS RELIEVED 476
H-14 LACK OF POWER WHEN PRESSURE RISES 477
H-15 IN L/O, F/O MODES, WORK EQUIPMENT SPEED IS FASTER THAN SPECIFIED SPEED 478
H-16 IN COMPOUND OPERATIONS, WORK EQUIPMENT WITH LARGE LOAD IS SLOW 478
H-17 IN SWING + BOOM RAISE, BOOM RAISE IS SLOW 479
H-18 IN SWING + TRAVEL, TRAVEL SPEED DROPS EXCESSIVELY 479
H-19 TRAVEL DEVIATION 479
H-20 TRAVEL SPEED IS SLOW 480
H-21 STEERING DOES NOT TURN EASILY OR LACKS POWER 482
H-22 TRAVEL SPEED DOES NOT SWITCH OR IS FASTER THAN SPECIFIED SPEED 484
H-23 TRAVEL DOES NOT MOVE (ONE SIDE ONLY) 484
H-24 DOES NOT SWING 485
H-25 SWING ACCELERATION IS POOR OR SWING SPEED IS SLOW 486
H-26 EXCESSIVE OVERRUN WHEN STOPPING SWING 488
H-27 EXCESSIVE SHOCK WHEN STOPPING SWING (ONE DIRECTION ONLY) 488
H-28 EXCESSIVE ABNORMAL NOISE WHEN STOPPING SWING 489
H-29 EXCESSIVE HYDRAULIC DRIFT OF SWING 489
H-30 SWING SPEED IS FASTER THAN SPECIFIED SPEED IN L/O AND F/O MODES 490
TROUBLESHOOTING OF MACHINE MONITOR SYSTEM (M CODE) 492
ACTION TAKEN BY MONITOR PANEL WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 492
ELECTRICAL CIRCUIT DIAGRAM FOR M MODE SYSTEM 494
M-1 [E101] ABNORMALITY IN ERRO DATA IS DISPLAYED; [E102] ERROR IN CLOCK DATA IS DISPLAYED 496
M-2 [E103] SHORT CIRCUIT IN BUZZER OUTPUT OR CONTACT OF 24V WIRING HARNESS WITH BUZZER DRIVE HARNESS IS DISPLAYED 497
M-3 [E104] AIR CLEANER CLOGGING DETECTED IS DISPLAYED 498
M-4 [E108] ENGINE COOLANT TEMPERATURE 105 C (221F) DETECTED IS DISPLAYED 498
M-5 WHEN STARTING SWITCH IS TURNED ON, NONE OF THE LAMPS ON MONITOR PANEL LIGHT UP FOR 3 SECONDS 500
M-6 WHEN STARTING SWITCH IS TURNED ON, MONITOR PANEL LAMPS ALL STAY LIT UP AND DO NOT GO OUT 502
M-7 WHEN STARTING SWITCH IS TURNED ON, ITEMS LIT UP ON MONITOR PANEL ARE DIFFERENT FROM ACTUAL MACHINE MODEL 502
M-8 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED), BASIC CHECK ITEMS FLASH 504
M-9 PREHEATING IS NOT BEING USED BUT PREHEATING MONITOR LIGHTS UP 507
M-10 WHEN STARTING SWITCH IS TURNED ON AND ENGINE IS STARTED, BASIC CHECK ITEMS FLASH 508
M-11 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED), CAUTION ITEMS, EMERGENCY ITEMS FLASH (BATTERY, ENGINE OIL PRESSURE L 510
M-12 WHEN STARTING SWITCH IS TURNED ON AND ENGINE IS STARTED, CAUTION ITEMS, EMERGENCY ITEMS FLASH (WHEN THERE IS NO ABNORMAL 512
M-13 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED), BUZZER DOES NOT SOUND FOR SECOND CAUTION ITEM FLASHES BUT BUZZER D 516
M-14 NO ABNORMALITY IS DISPLAYED ON MONITOR BUT BUZZER SOUNDS 516
M-15 NIGHT LIGHTING ON MONITOR PANEL DOES NOT LIGHT UP (LIQUID CRYSTAL DISPLAY IS NORMAL) 517
M-16 COOLANT TEMPERATURE GAUGE DOES NOT RISE 518
M-17 COOLANT TEMPERATURE GAUGE DOES NOT GIVE ANY DISPLAY (NONE OF THE GAUGE LAMPS LIGHT UP DURING OPERATION) 519
M-18 FUEL LEVEL GAUGE ALWAYS DISPLAYS FULL 520
M-19 FUEL LEVEL GAUGE DOES NOT GIVE DISPLAY 520
M-20 SWING LOCK SWITCH IS TURNED ON (LOCK) BUT SWING LOCK MONITOR DOES NOT LIGHT UP 521
M-21 SWING PROLIX SWITCH IS TURNED ON (PROLIX), BUT SWING LOCK MONITOR DOES NOT FLASH 522
M-22 SERVICE METER DOES NOT ADVANCE WHILE ENGINE IS RUNNING 523
M-23 WHEN STARTING SWITCH IS AT OFF AND TIME SWITCH IS PRESSED, TIME AND SERVICE METER ARE NOT DISPLAYED 523
M-24 DEFECTIVE FUEL LEVER SENSOR SYSTEM 524
M-25 DEFECTIVE COOLANT TEMPERATUER SENSOR SYSTEM 525
M-26 DEFECTIVE ENGINE OIL SENSOR SYSTEM 526
M-27 DEFECTIVE COOLANT LEVEL SENSOR SYSTEM 527
M-28 DEFECTIVE HYDRAULIC OIL LEVEL SENSOR SYSTEM 528
M-29 WIPER DOES NOT WORK, OR SWITCH IS NOT BEING USED BUT WIPER IS ACTUATED 530
M-30 WASHER MOTOR DOES NOT WORK, OR SWITCH IS NOT BEING USED BUT WASHER MOTOR IS ACTUATED 536
30 DISASSEMBLY AND ASSEMBLY 539
METHOD OF USING MANUAL 544
WHEN REMOVING OR INSTALLING UNIT ASSEMBLIES 544
GENERAL PRECAUTIONS 544
LISTING OF SPECIAL TOOLS 544
PRECAUTIONS WHEN CARRYING OUT OPERATION 545
PRECAUTIONS WHEN CARRYING OUT REMOVAL WORK 545
PRECAUTIONS WHEN CARRYING OUT INSTALLATION WORK 546
PRECAUTIONS WHEN COMPLETING OPERATIONS 546
SPECIAL TOOLS LIST 547
SPECIAL TOOL SKETCH 551
STARTER MOTOR 553
REMOVAL 553
INSTALLATION 553
ALTERNATOR 554
REMOVAL 554
INSTALLATION 554
AIR CONDITIONER COMPRESSOR 555
REMOVAL 555
INSTALLATION 555
AIR CONDITIONER CONDENSER 556
REMOVAL 556
INSTALLATION 556
RECEIVER DRIER 557
REMOVAL 557
INSTALLATION 557
FUEL INJECTION PUMP 558
REMOVAL 558
INSTALLATION 559
WATER PUMP 560
REMOVAL 560
INSTALLATION 561
NOZZLE HOLDER 562
REMOVAL 562
INSTALLATION 562
TURBOCHARGER 563
REMOVAL 563
INSTALLATION 563
THERMOSTAT 564
REMOVAL 564
INSTALLATION 564
GOVERNOR MOTOR 565
REMOVAL 565
INSTALLATION 565
CYLINDER HEAD ASSEMBLY 566
REMOVAL 566
INSTALLATION 568
RADIATOR – HYDRAULIC OIL COOLER 570
REMOVAL 570
INSTALLATION 571
ENGINE, MAIN PUMP 572
REMOVAL 572
INSTALLATION 575
DAMPER 576
REMOVAL 576
INSTALLATION 576
FUEL TANK 577
REMOVAL 577
INSTALLATION 577
CENTER SWIVEL JOINT 578
REMOVAL 578
INSTALLATION 579
DISASSEMBLY 580
ASSEMBLY 580
FINAL DRIVE 582
REMOVAL 582
INSTALLATION 582
DISASSEMBLY 583
ASSEMBLY 586
SPROCKET 590
REMOVAL 590
INSTALLATION 590
SWING MOTOR AND MACHINERY 592
REMOVAL 592
INSTALLATION 593
SWING MACHINERY 594
DISASSEMBLY 594
ASSEMBLY 597
REVOLVING FRAME 602
REMOVAL 602
INSTALLATION 603
SWING CIRCLE 604
REMOVAL 604
INSTALLATION 604
IDLER-RECOIL SPRING 605
REMOVAL 605
INSTALLATION 605
IDLER RECOIL SPRING 606
DISASSEMBLY 606
ASSEMBLY 607
IDLER 608
DISASSEMBLY 608
ASSEMBLY 609
TRACK ROLLER 612
REMOVAL 612
INSTALLATION 613
DISASSEMBLY 614
ASSEMBLY 615
CARRIER ROLLER 618
REMOVAL 618
INSTALLATION 618
DISASSEMBLY 619
ASSEMBLY 620
TRACK SHOE 622
REMOVAL 622
INSTALLATION 622
HYDRAULIC TANK 624
REMOVAL 624
INSTALLATION 625
MAIN PUMP 626
REMOVAL 626
INSTALLATION 628
MAIN PUMP INPUT SHAFT OIL SEAL 629
REMOVAL 629
INSTALLATION 629
CONTROL VALVE 630
REMOVAL 630
INSTALLATION 632
DISASSEMBLY 633
ASSEMBLY 638
PUMP MERGER-DIVIDER VALVE 641
DISASSEMBLY 641
ASSEMBLY 641
MAIN RELIEF VALVE 642
DISASSEMBLY 642
ASSEMBLY 642
PC VALVE 643
REMOVAL 643
INSTALLATION 643
LS VALVE 644
REMOVAL 644
INSTALLATION 644
PC-EPC, LS-EPC VALVES 645
REMOVAL 645
INSTALLATION 645
SOLENOID VALVE 646
REMOVAL 646
INSTALLATION 646
WORK EQUIPMENT – SWING PPC VALVE 648
REMOVAL 648
INSTALLATION 648
DISASSEMBLY 649
ASSEMBLY 650
TRAVEL PPC VALVE 652
REMOVAL 652
INSTALLATION 653
DISASSEMBLY 654
ASSEMBLY 655
BOOM LOCK VALVE 656
REMOVAL 656
INSTALLATION 656
BOOM CYLINDER 658
REMOVAL 658
INSTALLATION 659
ARM CYLINDER 660
REMOVAL 660
INSTALLATION 661
BUCKET CYLINDER 662
REMOVAL 662
INSTALLATION 663
HYDRAULIC CYLINDER 664
DISASSEMBLY 664
ASSEMBLY 666
WORK EQUIPMENT 670
REMOVAL 670
INSTALLATION 671
BUCKET 672
REMOVAL 672
INSTALLATION 673
ARM 674
REMOVAL 674
INSTALLATION 675
BUCKET – ARM 676
REMOVAL 676
INSTALLATION 677
BOOM 678
REMOVAL 678
INSTALLLATION 679
OPERATOR’S CAB 680
REMOVAL 680
INSTALLATION 681
COUNTERWEIGHT 682
REMOVAL 682
INSTALLATION 682
ENGINE THROTTLE – PUMP CONTROLLER 683
REMOVAL 683
INSTALLATION 683
CONTROL STAND CASE 684
REMOVAL 684
INSTALLATION 685
MONITOR 686
REMOVAL 686
INSTALLATION 686
40 MAINTENANCE STANDARD 687
SWING MACHINERY 690
SWING CIRCLE 693
FINAL DRIVE 694
TRACK FRAME AND RECOIL SPRING 696
CARRIER ROLLER 697
IDLER 698
TRACK ROLLER 701
TRACK SHOE 702
HYDRAULIC PUMP 704
CONTROL VALVE 705
VARIABLE PRESSURE COMPENSATION VALVE 711
SAFETY-SUCTION VALVE FOR SERVICE VALVE 712
SELF-REDUCING PRESSURE VALVE 713
SWING MOTOR 714
TRAVEL MOTOR 715
WORK EQUIPMENT AND SWING PPC VALVES 716
TRAVEL PPC VALVE 717
SERVICE PPC VALVE 718
EPC SOLENOID VALVE 719
CENTER SWIVEL JOINT 720
BOOM LOCK VALVE 721
HYDRAULIC CYLINDER 722
WORK EQUIPMENT 724
DIMENSION OF WORK EQUIPMENT 726
ARM PORTION 726
BUCKET PORTION 728

DESCRIPTION:

Komatsu PC270LC-6LE Hydraulic Excavator Shop Manual CEBD003001 – PDF DOWNLOAD

• MACHINE MODEL SERIAL NUMBERS
  PC270LC-6LE          A83001 and up

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 sections. These sections are further divided into each
main group of components.
GENERAL
This section lists the general machine dimensions, performance specifications, component weights, and fuel,
coolant and lubricant specification charts.
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.
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” to “Causes” are also
included in this section.
DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing, disassembling or assembling each
component, as well as precautions to be taken for these operations.
MAINTENANCE STANDARD
This section gives the judgement standards when inspecting disassembled parts.

G.B  14/12/24