Komatsu PC250-6 PC250LC-6 Excavator Shop Manual SEBM023200 PDF

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Komatsu PC250-6 PC250LC-6 Excavator Shop Manual SEBM023200 – PDF DOWNLOAD

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Komatsu PC250-6 PC250LC-6 Excavator Shop Manual SEBM023200 – PDF DOWNLOAD 

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

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TABLE OF CONTENTS:

Komatsu PC250-6 PC250LC-6 Excavator Shop Manual SEBM023200 – PDF DOWNLOAD 

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

COVER 1
CONTENTS 2
01 GENERAL 23
SPECIFICATION DIMENSION DRAWINGS 24
SPECIFICATIONS 25
WEIGHT TABLE 27
FUEL,COOLANT AND LUBRICANTS 29
10 STRUCTURE AND FUNCTION 31
ENGINE RELATED PARTS 32
REDIATOR 33
RADIATOR・OIL COOLER・AFTERCOOLER 33
POWER TRAIN 34
FINAL DRIVE 35
SWING CIRCLE 36
SWING MACHINERY 37
TRACK FRAME,RECOIL SPRING 38
TRACK SHOE 39
HYDRAULIC PIPING DRAWING 40
HYDRAULIC TANK 42
HYDRAULIC PUMP 43
LINE OIL FILTER 62
CONTROL VALVE 63
SELF-REDUCING PRESSURE VALVE 69
CLSS 74
SWING MOTOR 119
CENTER SWIVEL JOINT 125
TRAVEL MOTOR 126
VALVE CONTROL 135
WORK EQUIPMENT・SWING PPC VALVE 136
TRAVEL PPC VALVE 140
SERVICE PPC VALVE 144
SAFETY LOCK VALVE 147
PPC ACCUMULATOR 147
STRAIGHT-TRAVEL SYSTEM 148
SOLENOID VALVE 149
BOOM HOLDING VALVE 151
ADDITIONAL FILTER FOR BREAKER 154
WORK EQUIPMENT 155
AIR CONDITIONER 156
ACTUAL ELECTRIC WIRING DIAGRAM 157
ENGINE CONTROL SYSTEM 162
ELECTRONIC CONTROL SYSTEM 168
MONITOR SYSTEM 199
SENSORS 207
FRONT WINDOW AUTO PULL-UP SYSTEM 210
20 TESTING AND ADJUSTING 212
TABLE OF JUDGEMENT STANDARD VALUE 214
STANDARD VALUE TABLE FOR ELECTRICAL PARTS 223
TESTING AND ADJUSTING 232
TOOLS FOR TESTING,ADJUSTING,AND TROUBLESHOOTING 233
MEASURING ENGINE SPEED 234
MEASURING EXHAUST GAS COLOR 235
ADJUSTING VALVE CLEARANCE 236
MEASURING COMPRESSION PRESSURE 237
MEASURING BLOW-BY PRESSURE 237
TESTING AND ADJUSTING FUEL INJECTION TIMING 238
MEASURING ENGINE OIL PRESSURE 239
TESTING AND ADJUSTING ALTERNATOR BELT TENSION 240
TESTING AND ADJUSTING BELT TENSION FOR AIR CONDITIONER COMPRESSOR 240
MEASURING SPEED SENSOR 241
TESTING AND ADJUSTING GOVERNOR MOTOR LEVER STROKE 242
TESTING AND ADJUSTING HYDRAULIC PRESSURE IN WORK EPUIPMENT,SWING,TRAVEL,CIRCUIT 243
TESTING AND ADJUSTING PC VALVE OUTPUT PRESSURE (SERVO PISTON INPUIT PRESSURE) 246
TESTING AND ADJUSTING LS VALVE OUTPUT PRESSURE (SERVO PISTON INPUT PRESSURE)AND LS DIFFERENTIAL PRESSURE 248
TESTING AND ADJUSTING CONTROL CIRCUIT OIL PRESSURE 251
TESTING SOLENOID VALVE OUTPUT PRESSURE 252
MEASURING PPC VALVE OUTPUT PRESSURE 254
ADJUSTING WORK EQUIPMENT・SWING PPC VALVE 256
TESTING TRAVEL DEVIATION 257
TESTING LOCATIONS CAUSING HYDRAULIC DRIFT OF WORK EQUIPMENT 258
MEASURING OIL LEAKAGE 260
RELEASING REMAINING PRESSURE IN HYDRAULIC CIRCUIT 262
TESTING CLEARANCE OF SWING CIRCLE BEARING 263
TESTING AND ADJUSTING TRACK SHOE TENSION 264
BLEEDING AIR 265
TROUBLESHOOTING 268
POINTS TO REMEMBER WHEN TROUBLESHOOTING 269
SEQUENCE OF EVENTS IN TROUBLESHOOTING 270
POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE 271
CHECKS BEFORE TROUBLESHOOTING 279
CONNECTOR TYPES AND MOUNTING LOCATIONS 280
CONNECTION TABLE FOR CONNECTOR PIN NUMBERS 284
EXPLANATION OF CONTROL MECHANISM FOR ELECTRICAL SYSTEM 295
DISPLAY METHOD AND SPECIAL FUNCTIONS OF MONITOR PANEL 296
METHOD OF USING JUDGEMENT TABLE 306
METHOD OF USING TROUBLESHOOTING CHARTS 308
DETAILS OF TROUBLESHOOTING AND TROUBLESHOOTING PROCEDURE 310
SERVICE CODE TABLE 315
TROUBLESHOOTING OF COMMUNICATION ABNORMALITY SYSTEM (N MODE) 316
N-1 [E218] COMMUNICATIONS ABNORMALITY 317
TROUBLESHOOTING OF ENGINE THROTTLE・PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM) (E MODE) 319
POINTS TO REMEMBER WHEN CARRYING OUT TROUBLESHOOTING OF ENGINE THROTTLE・PUMP CONTROLLER SYSTEM 320
ACTION TAKEN BY CONTROLLER WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 321
JUDGEMENT TABLE FOR ENGINE THROTTLE・PUMP CONTROLLER (GOVERNOR CONTROL SYSTEM) AND ENGINE RELATED PARTS 325
ELECTRICAL CIRCUIT DIAGRAM FOR E MODE SYSTEM 327
E-1 ABNORMALITY IN ENGINE THROTTLE・PUMP CONTROLLER POWER SOURCE (CONTROLLER LED IS OFF) 329
E-2 [E308]ABNORMALITY IN FUEL CONTROL DIAL INPUT VALUE IS DISPLAYED 330
E-3 [E317]ABNORMALITY (DISCONNECTION) IN MOTOR DRIVE SYSTEM IS DISPLAYED 331
E-4 [E318]ABNORMALITY (SHORT CIRCUIT) IN MOTOR DRIVE SYSTEM IS DISPLAYED 332
E-5 [E306]ABNORMALITY IN FEEDBACK POTENTIOMETER SYSTEM IS DISPLAYED 333
E-6 [E315]ABNORMALITY (SHORT CIRCUIT) IN BATTERY RELAY OUTPUT SYSTEM IS DISPLAYED 334
E-7 [E316]ABNORMALITY (STEP-OUT) IN MOTOR IS DISPLAYED 335
E-8 ENGINE DOES NOT START 336
E-9 ENGINE SPEED IS IRREGULAR 339
a) IDLING SPEED IS IRREGULAR 339
b) THERE IS HUNTING 341
E-10 LACK OF OUTPUT (ENGINE HIGH IDLING SPEED IS TOO LOW) 343
E-11 ENGINE DOES NOT STOP 345
E-12 DEFECTIVE OPERATION OF BATTERY RELAY SYSTEM (ENGINE DOES NOT STOP) 347
TROUBLESHOOTING OF ENGINE SYSTEM (S MODE) 349
METHOD OF USING TROUBLESHOOTING CHARTS 350
S-1 STARTING PERFORMANCE IS POOR (STARTING ALWAYS TAKES TIME) 354
S-2 ENGINE DOES NOT START 355
(1)ENGINE DOES NOT TURN 355
(2)ENGINE TURNS BUT NO EXHAUST SMOKE COMES OUT (FUEL IS NOT BEING INJECTED) 356
(3)EXHAUST SMOKE COMES OUT BUT ENGINE DOES NOT START (FUEL IS BEING INJECTED) 357
S-3 ENGINE DOES NOT PICK UP SMOOTHLY (FOLLOW-UP IS POOR) 358
S-4 ENGINE STOPS DURING OPERATIONS 359
S-5 ENGINE DOES NOT ROTATE SMOOTHLY (HUNTING) 360
S-6 ENGINE LACK OUTPUT (NO POWER) 361
S-7 EXHAUST SMOKE IS BLACK (INCOMPLETE COMBUSTION) 362
S-8 OIL CONSUMPTION IS EXCESSIVE (OR EXHAUST SMOKE IS BLUE) 363
S-9 OIL BECOMES CONTAMINATED QUICKLY 364
S-10 FUEL CONSUMPTION IS EXCESSIVE 365
S-11 OIL IS IN COOLING WATER,OR WATER SPURTS BACK,OR WATER LEVEL GOES DOWN 366
S-12 OIL PRESSURE CAUTION LAMP LIGHTS UP (DROP IN OIL PRESSURE) 367
S-13 OIL LEVEL RISES (WATER,FUEL IN OIL) 368
S-14 WATER TEMPERATURE BECOMES TOO HIGH (OVERHEATING) 369
S-15 ABNORMAL NOISE IS MADE 370
S-16 VIBRATION IS EXCESSIVE 371
TROUBLESHOOTING OF ENGINE THROTTLE・PUMP CONTROLLER (PUMP CONTROL SYSTEM) (C MODE) 372
POINTS TO REMEMBER WHEN TROUBLESHOOTING PUMP CONTROLLER SYSTEM 373
ACTION TAKEN BY CONTROLLER WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 374
JUDGEMENT TABLE FOR ENGINE THROTTLE・PUMP CONTROLLER (PUMP CONTROL SYSTEM) AND HYDRAULIC RELATED PARTS 382
ELECTRICAL CIRCUIT DIAGRAM FOR C MODE 384
C-1 ABNORMALITY IN CONTROLLER POWER SOURCE SYSTEM (CONTROLLER LED IS OFF) 386
C-2 [E232]SHORT CIRCUIT IN PC-EPC SOLENOID SYSTEM IS DISPLAYED 387
C-3 [E233]DISCONNECTION IN PC-EPC SOLENOID SYSTEM IS DISPLAYED 388
C-4 [E203]SHORT CIRCUIT IN SWING BRAKE SOLENOID SYSTEM IS DISPLAYED 389
C-5 [E213]DISCONNECTION IN SWING BRAKE SOLENOID SYSTEM IS DISPLAYED 391
C-6 [E204]SHORT CIRCUIT IN PUMP MERGE/DIVIDER SOLENOID SYSTEM IS DISPLAYED 393
C-7 [E214]DISCONNECTION IN PUMP MERGE/DIVIDER SOLENOID SYSTEM IS DISPLAYED 394
C-8 [E207]SHORT CIRCUIT IN ACTIVE MODE SOLENOID SYSTEM IS DISPLAYED 395
C-9 [E208]DISCONNCETION IN ACTIVE MODE SOLENOID SYSTEM IS DISPLAYED 396
C-10 [E206]SHORT CIRCUIT IN TRAVEL SPEED SOLENOID SYSTEM IS DISPLAYED 397
C-11 [E216]DISCONNECTION IN TRAVEL SPEED SOLENOID SYSTEM IS DISPLAYED 398
C-12 [E205]SHORT CIRCUIT IN 2-STAGE RELIEF SOLENOID SYSTEM IS DISPLAYED 399
C-13 [E215]DISCONNECTION IN 2-STAGE RELIEF SOLENOID SYSTEM IS DISPLAYED 400
C-14 [E217]MODEL SELECTION INPUT ERROR IS DISPLAYED 401
C-15 [E222]SHORT CIRCUIT IN LS-EPC SOLENOID SYSTEM IS DISPLAYED 403
C-16 [E223]DISCONNECTION IN LS-EPC SOLENOID SYSTEM IS DISPLAYED 404
C-17 [E224]ABNORMALITY IN FRONT PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 405
C-18 [E225]ABNORMALITY IN REAR PUMP PRESSURE SENSOR SYSTEM IS DISPLAYED 406
C-19 [E226]ABNORMALITY IN PRESSURE SENSOR POWER SOURCE SYSTEM IS DISPLAYED 407
C-20 [E227]ABNORMALITY IN ENGINE SPEED SENSOR SYSTEM IS DISPLAYED 408
C-21 [E302]SHORT CIRCUIT IN SWING STROKE LIMIT SOLENOID SYSTEM IS DISPLAYED 409
C-22 [E303]DISCONNECTION IN SWING STROKE LIMIT SOLENOID SYSTEM IS DISPLAYED 410
TROUBLESHOOTING OF ENGINE THROTTLE・PUMP CONTROLLER (INPUT SIGNAL SYSTEM) (F MODE) 411
ELECTRICAL CIRCUIT DIAGRAM FOR F MODE 412
F-1 BIT PATTERN 20-(1)SWING OIL PRESSURE SWITCH DOES NOT LIGHT UP 414
F-2 BIT PATTERN 20-(2)TRAVEL OIL PRESSURE SWITCH DOES NOT LIGHT UP 415
F-3 BIT PATTERN 20-(3)BOOM LOWER OIL PRESSURE SWITCH DOES NOT LIGHT UP 416
F-4 BIT PATTERN 20-(4)BOOM RAISE OIL PRESSURE SWITCH DOSE NOT LIGHT UP 417
F-5 BIT PATTERN 20-(5)ARM IN OIL PRESSURE SWITCH DOES NOT LIGHT UP 418
F-6 BIT PATTERN 20-(6)ARM OUT OIL PRESSURE SWITCH DOES NOT LIGHT UP 419
F-7 BIT PATTERN 21-(1)BUCKET CURL OIL PRESSURE SWITCH DOES NOT LIGHT UP 420
F-8 BIT PATTERN 21-(2)BUCKET DUMP OIL PRESSURE SWITCH DOES NOT LIGHT UP 421
F-9 BIT PATTERN 21-(3)SWING LOCK SWITCH DOES NOT LIGHT UP 422
F-10 BIT PATTERN 22-(5)KEROSENE MODE CONNECTION DOES NOT LIGHT UP 423
F-11 BIT PATTERN 22-(6)L H KNOB SWITCH DOES NOT LIGHT UP 424
TROUBLESHOOTING OF HYDRAULIC AND MECHANICAL SYSTEM (H MODE) 425
TABLE OF FAILURE MODES AND CAUSES FOR HYDRAULIC AND MECHANICAL SYSTEM 426
PUMP MERGE/DIVIDER LOGIC 430
SOLENOID ACTUATION TABLE 431
H-1 SPEEDS OF ALL WORK EQUIPMENT,SWING,TRAVEL ARE SLOW OR LACK POWER 432
H-2 THERE IS EXCESSIVE DROP IN ENGINE SPEED,OR ENGINE STALLS 434
H-3 NO WORK EQUIPMENT,TRAVEL,SWING MOVE 435
H-4 ABNORMAL NOISE GENERATED (AROUND PUMP) 435
H-5 AUTO-DECELERATION DOES NOT WORK (PPC SHUTTLE VALVE IS EQUIPPED ONLY IN TRAVEL PPC VALVE) 436
H-6 FINE CONTROL ABILITY IS POOR OR RESPONSE IS POOR 436
H-7 BOOM IS SLOW OR LACKS POWER 437
H-8 ARM IS SLOW OR LACKS POWER 439
H-9 BUCKET IS SLOW OR LACKS POWER 441
H-10 WORK EQUIPMENT (BOOM,ARM,BUCKET) DOES NOT MOVE (BUT TRAVEL AND SWING ARE NORMAL) 442
H-11 EXCESSIVE HYDRAULIC DRIFT 442
H-12 EXCESSIVE TIME LAG (ENGINE AT LOW IDLING) 443
H-13 OTHER EQUIPMENT MOVES WHEN SINGLE CIRCUIT IS RELIEVED 443
H-14 LACK OF POWER WHEN PRESSURE RISES 444
H-15 IN L/O,F/O MODES,WORK EQUIPMENT SPEED IS FASTER THAN SPECIFIED SPEED 445
H-16 IN COMPOUND OPERATIONS,WORK EQUIPMENT WITH LARGE LOAD IS SLOW 445
H-17 IN SWING + BOOM RAISE,BOOM RAISE IS SLOW 446
H-18 IN SWING + TRAVEL,TRAVEL SPEED DROPS EXCESSIVELY 446
H-19 TRAVEL DEVIATION 447
H-20 TRAVEL SPEED IS SLOW 448
H-21 STEERING DOES NOT TURN EASILY OR LACKS POWER 450
H-22 TRAVEL SPEED DOES NOT SWITCH OR IS FASTER THAN SPECIFIED SPEED 452
H-23 TRAVEL DOES NOT MOVE (ONE SIDE ONLY) 452
H-24 DOES NOT SWING 453
H-25 SWING ACCELERATION IS POOR OR SWING SPEED IS SLOW 454
H-26 EXCESSIVE OVERRUN WHEN STOPPING SWING 456
H-27 EXCESSIVE SHOCK WHEN STOPPING SWING (ONE DIRECTION ONLY) 457
H-28 EXCESSIVE ABNORMAL NOISE WHEN STOPPING SWING 457
H-29 EXCESSIVE HYDRAULIC DRIFT OF SWING 458
H-30 SWING SPEED IS FASTER THAN SPECIFIED SPEED IN L/O,F/O MODES 459
TROUBLESHOOTING OF MACHINE MONITOR SYSTEM (M MODE) 460
ACTIOM TAKEN BY MONITOR PANEL WHEN ABNORMALITY OCCURS AND PROBLEMS ON MACHINE 462
ELECTRICAL CIRCUIT DIAGRAN FOR M MODE SYSTEM 464
M-1 [E101]ABNORMALITY IN ERROR DATA IS DISPLAYED [E102]ERROR IN CLOCK DATA IS DISPLAYED 466
M-2 [E103]SHORT CIRCUIT IN BUZZER OUTPUT OR CONTACT OF 24V WIRING HARNESS WITH BUZZER DRIVE HARNESS IS DISPLAYED 467
M-3 [E104]AIR CLEANER CLOGGING DETECTED IS DISPLAYED 468
M-4 [E108]ENGINE WATER TEMPERATURE 105゜C DETECTED IS DISPLAYED 468
M-5 WHEN STARTING SWITCH IS TURNED ON,NONE OF LAMPS ON MONITOR PANEL LIGHT UP FOR 3 SECONDS 469
a) NONE OF LAMPS ON MONITOR PANEL LIGHT UP 469
b) SOME OF LAMPS ON MONITOR PANEL NOT LIGHT UP 469
M-6 WHEN STARTING SWITCH IS TURNED ON,MONITOR PANEL LAMPS ALL STAY LIGHTED UP AND DO NOT GO OUT 471
M-7 WHEN STARTING SWITCH IS TURNED ON,ITEMS LIGHTED UP ON MONITOR PANEL ARE DIFFERENT FROM ACTUAL MACHINE (MODEL) 471
M-8 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED),BASIC CHECK ITEMS FLASH 472
a) (COOLANT LEVEL) FLASHES 472
b) (ENGINE OIL LEVEL) FLASHES 473
c) (HYDRAULIC OIL LEVEL) FLASHES 474
M-9 PREHEATING IS NOT BEING USED BUT (PREHEATING MONITOR) LIGHTS UP 475
M-10 WHEN STARTING SWITCH IS TURNED ON AND ENGINE IS STARTED,BASIC CHECK ITEMS FLASH 476
a) ALTERNATOR SYSTEM 476
b) ENGINE OIL PRESSURE SYSTEM 477
M-11 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED),CAUTION ITEMS,EMERGENCY ITEMS FLASH (BATTERY,ENGINE OIL PRESSURE LAMPS DO NOT LIGHT UP) 478
a) ALTERNATOR SYSTEM 478
b) ENGINE OIL PRESSURE SENSOR SYSTEM 479
M-12 WHEN STARTING SWITCH IS TURNED ON AND ENGINE IS STARTED,CAUTION ITEMS,EMERGENCY ITEMS FLASH (WHEN THERE IS NO ABNORMALITY IN ENGINE OR ITEMS TO CHECK BEFORE TROUBLESHOOTING) 480
a) (ENGINE OIL PRESSURE) FLASHES 480
b) (COOLANT LEVEL) FLASHES 480
c) (BATTERY CHARGE) FLASHES 480
d) (COOLANT TEMPERATURE) FLASHES 481
e) (FUEL LEVEL) FLASHES 481
f) (AIR CLEANER CLOGGING) FLASHES 482
M-13 WHEN STARTING SWITCH IS TURNED ON (ENGINE STOPPED),BUZZER DOES NOT SOUND FOR 1 SECOND, CAUTION ITEM FLASHES BUT BUZZER DOES NOT SOUND 483
M-14 NO ABNORMALITY IS DISPLAYED ON MONITOR BUT BUZZER SOUNDS 483
M-15 NIGHT LIGHTING ON MONITOR PANEL DOES NOT LIGHT UP (LIQUID CRYSTAL DISPLAY IS NORMAL) 484
M-16 COOLANT TEMPERATURE GAUGE DOES NOT RISE 485
M-17 COOLANT TEMPERATURE GAUGE DOES NOT GIVE ANY DISPLAY (NONE OF GAUGE LAMPS LIGHT UP DURING OPERATION) 485
M-18 FUEL LEVEL GAUGE ALWAYS DISPLAYS FULL 486
M-19 FUEL LEVEL GAUGE DOES NOT GIVE DISPLAY 486
M-20 SWING LOCK SWITCH IS TURNED ON (LOCK) BUT (SWING LOCK MONITOR) DOES NOT LIGHT UP 487
M-21 SWING PROLIX SWITCH IS TURNED ON (PROLIX),BUT (SWING LOCK MONITOR) DOES NOT FLASH 487
M-22 SERVICE METER DOES NOT ADVANCE WHILE ENGINE IS RUNNING 488
M-23 WHEN STARTING SWITCH IS AT OFF AND TIME SWITCH IS PRESSED,TIME AND SERVICE METER ARE NOT DISPLAYED 488
M-24 DEFECTIVE FUEL LEVEL SENSOR SYSTEM 489
M-25 DEFECTIVE COOLANT TEMPERATURE SENSOR SYSTEM 490
M-26 DEFECTIVE ENGINE OIL LEVEL SENSOR SYSTEM 491
M-27 DEFECTIVE COOLANT LEVEL SENSOR SYSTEM 492
M-28 DEFECTIVE HYDRAULIC OIL LEVEL SENSOR SYSTEM 493
M-29 WIPER DOES NOT WORK,OR SWITCH IS NOT BEING USED BUT WIPER IS ACTUATED 494
a) WIPER DOES NOT WORK 494
b) WIPER SWITCH IS NOT BEING OPERATED BUT WIPER IS ACTUATED 497
M-30 WASHER MOTOR DOES NOT WORK,OR SWITCH IS NOT BEING USED BUT WASHER MOTOR IS ACTUATED 499
a) WASHER MOTOR DOES NOT WORK 499
b) SWITCH IS NOT BEING OPERATED BUT WASHER IS ACTUATED 500
30 DISASSEMBLY AND ASSEMBLY 501
METHOD OF USING MANUAL 503
PRECAUTIONS WHEN CARRYING OUT OPERATION 504
SPECIAL TOOL LIST 506
SKETCHES OF SPECIAL TOOLS 512
STARTING MOTOR 515
REMOVAL AND INSTALLATION 515
ALTERNATOR 516
REMOVAL AND INSTALLATION 516
AIR CONDITIONER COMPRESSOR 517
REMOVAL AND INSTALLATION 517
AIR CONDITIONER CONDENSER 518
REMOVAL AND INSTALLATION 518
DRY RECEIVER 519
REMOVAL AND INSTALLATION 519
ENGINE OIL COOLER CORE 520
REMOVAL AND INSTALLATION 520
FUEL INJECTION PUMP 521
REMOVAL 521
INSTALLATION 524
WATER PUMP 526
REMOVAL 526
INSTALLATION 527
NOZZLE HOLDER 528
REMOVAL AND INSTALLATION 528
TURBOCHARGER 529
REMOVAL AND INSTALLATION 529
THERMOSTAT 530
REMOVAL 530
INSTALLATION 531
GOVERNOR MOTOR 532
REMOVAL AND INSTALLATION 532
CYLINDER HEAD 533
REMOVAL 533
INSTALLATION 538
HYDRAULIC OIL COOLER 541
REMOVAL AND INSTALLATION 541
RADIATOR,HYDRAULIC OIL COOLER 542
REMOVAL 542
INSTALLATION 544
ENGINE,MAIN PUMP 545
REMOVAL 545
INSTALLATION 549
DAMPER 550
REMOVAL AND INSTALLATION 550
FUEL TANK 551
REMOVAL AND INSTALLATION 551
CENTER SWIVEL JOINT 552
REMOVAL 552
INSTALLATION 553
DISASSEMBLY AND ASSEMBLY 554
FINAL DRIVE 555
REMOVAL AND INSTALLATION 555
DISASSEMBLY 556
ASSEMBLY 560
TRAVEL MOTOR 566
DISASSEMBLY 566
ASSEMBLY 571
SPROCKET 580
REMOVAL AND INSTALLATION 580
SWING MOTOR AND SWING MACHINERY 581
REMOVAL 581
INSTALLATION 582
SWING MACHINERY 583
DISASSEMBLY 583
ASSEMBLY 587
SWING MOTOR 592
DISASSEMBLY 592
ASSEMBLY 596
REVOLVING FRAME 603
REMOVAL 603
INSTALLATION 604
SWING CIRCLE 605
REMOVAL AND INSTALLATION 605
IDLER,RECOIL SPRING 606
REMOVAL AND INSTALLATION 606
IDLER 607
DISASSEMBLY 607
ASSEMBLY 608
RECOIL SPRING 610
DISASSEMBLY 610
ASSEMBLY 611
TRACK ROLLER 612
REMOVAL AND INSTALLATION 612
DISASSEMBLY 613
ASSEMBLY 614
CARRIER ROLLER 616
REMOVAL AND INSTALLATION 616
DISASSEMBLY 617
ASSEMBLY 619
TRACK SHOE 621
REMOVAL AND INSTALLATION 621
HYDRAULIC TANK 622
REMOVAL 622
INSTALLATION 623
MAIN PUMP 624
REMOVAL 624
INSTALLATION 626
DISASSEMBLY 627
ASSEMBLY 640
MAIN PUMP INPUT SHAFT OIL SEAL 656
REMOVAL AND INSTALLATION 656
CONTROL VALVE 657
REMOVAL 657
INSTALLATION 659
DISASSEMBLY 660
ASSEMBLY 665
PUMP MERGE-DIVIDER VALVE 671
DISASSEMBLY AND ASSEMBLY 671
MAIN RELIEF VALVE 672
DISASSEMBLY AND ASSEMBLY 672
PC VALVE 673
REMOVAL 673
INSTALLATION 674
LS VALVE 675
REMOVAL AND INSTALLATION 675
PC, LS-EPC VALVE 676
REMOVAL AND INSTALLATION 676
SOLENOID VALVE 677
REMOVAL AND INSTALLATION 677
WORK EQUIPMENT・SWING PPC VALVE 678
REMOVAL AND INSTALLATION 678
DISASSEMBLY 679
ASSEMBLY 680
TEAVEL PPC VALVE 681
REMOVAL AND INSTALLATION 681
DISASSEMBLY 682
BOOM LOCK VALVE 684
REMOVAL AND INSTALLATION 684
BOOM CYLINDER 685
REMOVAL 685
INSTALLATION 686
ARM CYLINDER 687
REMOVAL 687
INSTALLATION 688
BUCKET CYLINDER 689
REMOVAL 689
INSTALLATION 690
HYDRAULIC CYLINDER 691
DISASSEMBLY 691
ASSEMBLY 694
WORK EQUIPMENT 698
REMOVAL 698
INSTALLATION 699
BUCKET 700
REMOVAL 700
INSTALLATION 701
ARM 702
REMOVAL 702
INSTALLATION 703
BUCKET・ARM 704
REMOVAL 704
INSTALLATION 705
BOOM 706
REMOVAL 706
INSTALLATION 707
OPERATOR’S CAB 708
REMOVAL 708
INSTALLATION 709
COUNTERWEIGHT 710
REMOVAL AND INSTALLATION 710
ENGINE THROTTLE・PUMP CONTROLLER 711
REMOVAL AND INSTALLATION 711
CONTROL STAND CASE 712
REMOVAL 712
INSTALLATION 713
MONITOR 714
REMOVAL AND INSTALLATION 714
40 MAINTENANCE STANDARD 715
SWING MACHINERY 716
FINAL DRIVE 718
SWING CIRCLE 720
TRACK FRAME AND RECOIL SPRING 721
IDLER 722
CARRIER ROLLER 724
TRACK ROLLER 725
TRACK SHOE 726
HYDRAULIC PUMP 730
CONTROL VALVE 731
SELF-REDUCING PRESSURE VALVE 739
SWING MOTOR 740
TRAVEL MOTOR 741
WORK EQUIPMENT・SWING PPC VALVE 742
TRAVEL PPC VALVE 743
SERVICE PPC VALVE 744
CENTER SWIVEL JOINT 745
BOOM HOLDING VALVE 746
HYDRAULIC CYLINDER 747
WORK EQUIPMENT 749
DIMENSION OF WORK EQUIPMENT 751
90 OTHERS 754
HYDRAULIC CIRCUIT DIAGRAM 755
ELECTRICAL CIRCUIT DIAGRAM (1/2) 756
ELECTRICAL CIRCUIT DIAGRAM (2/2) 757

DESCRIPTION:

Komatsu PC250-6 PC250LC-6 Excavator Shop Manual SEBM023200 – 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.
The specifications contained in this shop manual are subject to change at any
time and without any advance notice. Use the specifications given in the book
with the latest date.

S.V 24/12/24