Komatsu Bulldozer D20A-6 D20P-6 D20S-6, D20Q-6 D21A-6 D21P-6 D21S-6 D21Q-6 Shop Manual PDF

Description

Komatsu Bulldozer D20A-6 D20P-6 D20S-6, D20Q-6 D21A-6 D21P-6 D21S-6 D21Q-6 Shop Manual SEBM01040604 – PDF DOWNLOAD 

FILE DETAILS:

Komatsu Bulldozer D20A-6 D20P-6 D20S-6, D20Q-6 D21A-6 D21P-6 D21S-6 D21Q-6 Shop Manual SEBM01040604 – PDF DOWNLOAD 

Language : English
Pages : 493
Downloadable : Yes
File Type : PDF

IMAGES PREVIEW OF THE MANUAL:

TABLE OF CONTENTS:

Komatsu Bulldozer D20A-6 D20P-6 D20S-6, D20Q-6 D21A-6 D21P-6 D21S-6 D21Q-6 Shop Manual SEBM01040604 – PDF DOWNLOAD 

COVER 1
CONTENTS 2
10 ENGINE 18
12 TESTING AND ADJUSTING 18
TESTING AND ADJUSTING DATA 19
TOOL LIST FOR TESTING AND ADJUSTING 20
ADJUSTING VALVE CLEARANCE 21
MEASURING EXHAUST GAS COLOR 22
MEASURING COMPRESSION PRESSURE 23
MEASURING BLOW-BY PRESSURE 24
ADJUSTING FUEL INJECTION TIMING 25
TESTING AND ADJUSTING FAN BELT TENSION 26
13 DISASSEMBLY AND ASSEMBLY 27
STARTING MOTOR 28
REMOVAL AND INSTALLATION 28
ALTERNATOR 28
REMOVAL AND INSTALLATION 28
WATER PUMP 28
REMOVAL AND INSTALLATION 28
FUEL INJECTION PUMP 30
REMOVAL AND INSTALLATION 30
NOZZLE HOLDER 30
REMOVAL AND INSTALLATION 30
CYLINDER HEAD 32
REMOVAL AND INSTALLATION 32
RADIATOR GUARD 34
REMOVAL AND INSTALLATION 34
RADIATOR 36
REMOVAL AND INSTALLATION 36
THERMOSTAT 36
REMOVAL AND INSTALLATION 36
ENGINE 38
REMOVAL 38
INSTALLATION 40
20 POWER TRAIN 42
21 STRUCTURE AND FUNCTION 42
GENERAL (D20-6) 43
GENERAL (D21A,P,PL-6,D21P-6A) 45
GENERAL (D21E-6,D21P-6B,D21S-6A) 47
POWER TRAIN HYDRAULIC SYSTEM(D21A,P,S,Q-6,D21P-6A) 49
POWER TRAIN HYDRAULIC CIRCUIT DIAGRAM (D21A,P,S,Q-6,D21P-6A) 50
POWER TRAIN HYDRAULIC SYSTEM (D21E-6,D21P-6B,D21S-6A) 51
POWER TRAIN HYDRAULIC CIRCUIT DIAGRAM (D21E-6,D21P-6B,D21S-6A) 52
MAIN CLUTCH (D20-6) 53
MAIN CLUTCH CONTROL (D20-6) 58
TRANSMISSION (D20-6) 59
DAMPER AND UNIVERSAL JOINT (D21A,P,S,Q-6,D21P-6A) 63
DAMPER AND UNIVERSAL JOINT (D21E-6,D21P-6B,D21S-6A) 64
HYDROSHIFT TRANSMISSION (D21A,P,S,Q-6,D21P-6A) 65
HYDROSHIFT TRANSMISSION (D21E-6,D21P-6B,D21S-6A) 71
TRANSMISSION CONTROL (D21A,P,S,Q-6,D21P-6A) 78
TRANSMISSION CONTROL (D21E-6,D21P-6B,D21S-6A) 79
HYDROSHIFT TRANSMISSION HYDRAULIC SYSTEM (D21A,P,S,Q-6,D21P-6A) 80
HYDROSHIFT TRANSMISSION HYDRAULIC CIRCUIT DIAGRAM (D21A,P,S, Q-6,D21P-6A) 81
HYDROSHIFT TRANSMISSION HYDROULIC SYSTEM (D21E-6,D21P-6B,D21S-6A) 82
HYDROSHIFT TRANSMISSION HYDRAULIC CIRCUIT DIAGRAM (D21E-6,D21P-6B,D21S-6A) 83
TRANSMISSION CONTROL VALVE (D21A,P,S,Q-6,D21P-6A) 84
TRANSMISSION CONTROL VALVE (D21E-6,D21P-6B,D21S-6A) 86
TRANSMISSION PUMP (21-6) 93
BEVEL GEAR SHAFT AND STEERING CLUTCH 94
STEERING CONTROL 97
STEERING HYDRAULIC PIPING (D20-6) 98
STEERING HYDRAULIC PIPING (D21-6) 99
STEERING HYDRAULIC SYSTEM (D20-6) 100
STEERING HYDRAULIC CIRCUIT DIAGRAM (D20-6) 100
STEERING HYDRAULIC SYSTEM (D21-6) 101
STEERING HYDRAULIC CIRCUIT DIAGRAM (D21-6) 101
MAIN CLUTCH AND STEERING PUMP (D20-6) 102
STEERING MAIN RELIEF VALVE (D20-6) 103
STEERING CONTROL VALVE 104
STEERING BOOSTER CYLINDER 107
STEERING BRAKE 108
FINAL DRIVE 110
22 TESTING AND ADJUSTING 111
STANDARD FOR TESTING AND ADJUSTING 112
TESTING AND ADJUSTING TOOL LIST 114
MEASURING OIL PRESSURE 115
MEASURING OIL TEMPERATURE 117
TESTING TRAVEL 118
MEASURING OPERATING FORCE 120
ADJUSTING FUEL CONTROL LEVER 122
ADJUSTING MAIN CLUTCH CONTROL LINKAGE 123
ADJUSTING INCHING CONTROL LINKAGE 124
ADJUSTING GEAR SHIFT LEVER CONTROL LINKAGE 126
ADJUSTING STEERING CONTROL LINKAGE 127
ADJUSTING BRAKE PEDAL LINKAGE 128
ADJUSTING CLEARANCE OF BRAKE LINING 128
TROUBLESHOOTING 129
1 MACHINE DOES NOT MOVE OFF 130
2 DRAWBAR-PULL IS SMALL OR TRAVEL SPEED IS LOW 131
3 TIME LAG IS EXCESSIVE WHEN MOVING OFF OR GEARSHIFTING 132
4 WHEN ENGINE IS STARTED, MACHINE MOVES 133
5 MACHINE SHOCK IS EXCESSIVE WHEN MOVING OFF AND GEARSHIFTING 133
6 OIL QUANTITY IN TRANSMISSION AND BEVEL GEAR CASE FLUCTUATES 133
23 DISASSEMBLY AND ASSEMBLY 134
MAIN CLUTCH (D20-6) 135
REMOVAL AND INSTALLTION 135
DISASSEMBLY 137
ASSEMBLY 143
TRANSMISSION (D20-6) 149
REMOVAL AND INSTALLATION 149
DISASSEMBLY 151
ASSEMBLY 157
DAMPER (D21-6) 165
REMOVAL AND INSTALLATION 165
HYDROSHIFT TRANSMISSION (D21-6) 167
REMOVAL 167
INSTALLATION 171
DISASSEMBLY (D21A,P,S,Q-6,D21P-6A) 175
ASSEMBLY(D21A,P,S,Q-6,D21P-6A) 191
DISASSEMBLY (D21E-6,D21P-6B,D21S-6A) 209
ASSEMBLY (D21E-6,D21P-6B,D21S-6A) 223
TRANSMISSION PUMP D21-6） 239
REMOVAL 239
INSTALLATION 243
MODULATING VALVE(D21-6) 247
REMOVAL AND INSTALLATION 247
DISASSEMBLY AND ASSEMBLY 249
SELECTOR AND INCHING VALVE (D21-6) 247
REMOVAL AND INSTALLATION 247
DISASSEMBLY AND ASSEMBLY 251
STEERING PUMP (D20-6) 253
REMOVAL AND INSTALLATION 253
STEERING MAIN RELIEF VALVE (D20-6) 253
REMOVAL AND INSTALLATION 253
STEERING VALVE 255
REMOVAL AND INSTALLATION 255
DISASSEMBLY AND ASSEMBLY 255
STEERING CLUTCH 257
REMOVAL 257
INSTALLATION 261
DISASSEMBLY 265
ASSEMBLY 267
BEVEL GEAR SHAFT AND BEVEL GEAR 271
REMOVAL 271
INSTALLATION 275
FINAL DRIVE 283
REMOVAL AND INSTALLATION 283
FINAL DRIVE FIRST PINION 285
REMOVAL 285
INSTALLATION 287
FINAL DRIVE 289
DISASSEMBLY 289
ASSEMBLY 293
24 MAINTENANCE STANDARD 297
MAIN CLUTCH (D20-6) 298
MAIN CLUTCH AND STEERING PUMP (D20-6) 301
TRANSMISSION (D20-6) 302
DAMPER AND UNIVERSAL JOINT (D21-6) 305
HYDROSHIFT TRANSMISSION (D21A,P,S,Q-6,D21P-6A) 306
HYDROSHIFT TRANSMISSION (D21E-6,D21P-6B,D21S-6A ) 308
TRANSMISSION CONTROL VALVE (D21A,P,S,Q-6,D21P-6A) 312
TRANSMISSION CONTROL VALVE (D21E-6,D21P-6B,D21S-6A) 314
TRANSMISSION AND STEERING PUMP (D21-6) 316
BEVEL GEAR SHAFT 317
STEERING CLUTCH 318
STEERING MAIN RELIEF VALVE (D20-6) 320
STEERING CONTROL VALVE 321
STEERING BOOSER CYLINDER 322
STEERING BRAKE 323
FINAL DRIVE 324
30 UNDERCARRIAGE 326
31 STRUCTURE AND FUNCTION 326
TRACK (DRY TYPE TRACK LINK) (D20,21A,P-6,D21E-6,D20,21P-6A,D21P-6B) 327
TRACK (LUBRICATED TRACK LINK) (D20,21A,P-6,D21E-6,D20,21P-6A,D21P-6B) 328
TRACK (DRY TYPE TRACK LINK) (D20,21S,Q-6,D21S-6A) 329
TRACK (LUBRICATED TRACK LINK) (D20,21S,Q-6,D21S-6A) 330
TRACK GROUP (D20,21A,P,S,Q-6,D20,21P-6A) 331
TRACK GROUP (D21E-6,D21P-6B,D21S-6A,D20,21PL-6,D20PLL-6) 332
IDLER 333
IDLER CUSHION 334
TRACK ROLLER 335
CARRIER ROLLER 335
MAIN FRAME AND SUSPENSION 336
33 DISASSEMBLY AND ASSEMBLY 337
TRACK FRAME 338
REMOVAL AND INSTALLATION 338
RECOIL SPRING 340
REMOVAL AND INSTALLATION 340
DISASSEMBLY AND ASSEMBLY 342
IDLER 342
REMOVAL AND INSTALLATION 342
CARRIER ROLLER 342
REMOVAL AND INSTALLATION 342
TRACK ROLLER 344
REMOVAL AND INSTALLATION 344
TRACK SHOE 346
REMOVAL AND INSTALLATION (D20,21A,E,S,Q-6,D20,21P-6A,B) 346
REMOVAL AND INSTALLATION (D20,21P,PL-6) 348
34 MAINTENANCE STANDARD 350
TRACK (DRY TYPE TRACK LINK) (D20,21A,P,PL-6,D21E-6,D20,21P-6A,D21P-6B) 351
TRACK (LUBRICATED TRACK LINK) (D20,21A,P,PL-6,D21E-6,D20,21P-6A,D21P-6B) 353
TRACK (DRY TYPE TRACK LINK) (D20,21S,Q-6,D21S-6A) 355
TRACK (LUBRICATED TRACK LINK) (D20,21S,Q-6,D21S-6A) 357
TRACK FRAME 359
IDLER CUSHION 360
IDLER 361
TRACK ROLLER 363
CARRIER ROLLER 364
60 HYDRAULIC SYSTEM 365
61 STRUCTURE AND FUNCTION 365
HYDRAULIC PIPING (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 366
HYDRAULIC CONTROL (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 367
HYDRAULIC CIRCUIT SYSTEM (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 368
HYDRAULIC CIRCUIT DIAGRAM (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 369
HYDRAULIC PIPING (D20,21P,PL,PLL-6) 370
HYDRAULIC CONTROL (D20,21P,PL,PLL-6) 371
HYDRAULIC CIRCUIT SYSTEM (D20,21P,PL,PLL-6) 372
HYDRAULIC CIRCUIT DIAGRAM (D20,21P,PL,PLL-6) 373
HYDRAULIC PIPING (D20,21S,Q-6,D21S-6A) 374
HYDRAULIC CONTROL (D20,21S,Q-6,D21S-6A) 375
HYDRAULIC CIRCUIT SYSTEM (D20,21S,Q-6,D21S-6A) 376
HYDRAULIC CIRCUIT DIAGRAM (D20,21S,Q-6,D21S-6A) 377
HYDRAULIC TANK AND FILTER 378
HYDRAULIC PUMP 379
HYDRAULIC CONTROL VALVE (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 380
HYDRAULIC CONTROL VALVE (D20,21P,PL,PLL-6) 382
HYDRAULIC CONTROL VALVE (D20,21S,Q-6,D21S-6A) 384
HYDRAULIC LEVER OPERATION (D20,21A,E,P-6) 389
HYDRAULIC LEVER OPERATION (D20,21S,Q-6) 395
HYDRAULIC CYLINDER (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 399
HYDRAULIC CYLINDER (D20,21P,PL,PLL-6) 401
HYDRAULIC CYLINDER (D20,21S,Q-6) 403
62 TESTING AND ADJUSTING 405
STANDARDS FOR TESTING AND ADJUSTING 406
TESTING AND ADUSTING TOOL LIST 407
MEASURING AND ADJUSTING OIL PRESSURE 408
MEASURING OIL TEMPERATURE 409
BLEEDING AIR FROM ANGLE CYLINDER HEAD CIRCUIT 409
TESTING TRAVEL 410
MEASURING OPERATING FORCE 410
TESTING PERFORMANCE OF WORK EQUIPMENT 411
MEASURING HYDRAULIC DRIFT OF WORK EQUIPMENT 413
TROUBLESHOOTING 414
1 BLADE LACKS LIFTING POWER AND LIFTING SPEED IN SLOW 415
2 BLADE DOES NOT RISE, THE FRONT OF MACHINE CANNOT BE RAISED OFF GROUND WHEN LOWERING THE BLADE 416
3 HYDRAULIC DRIFT OF BLADE LIFT CYLINDER IS EXCESSIVE 417
4 BLADE MOVES UNSTEADILY WHEN LEVELING THE GROUND (CONTROL LEVER AT HOLD) 418
5 BLADE LOWER UNDER THE FOLLOWING CONDITIONS 418
6 BALDE LACKS TILTING POWER, BLADE TILTING SPEED IS SLOW THE MACHINE CANNOT BE RAISED OFF GROUND BY BLADE TILTING POWER 419
7 BLADE TILT CYLINDER DOES NOT MOVE (TILTING IS IMPOSSIBLE) 420
8 HYDRAULIC DRIFT OF BLADE TILT CYLINDER IS EXCESSIVE 421
9 BLADE LACKS ANGLING POWER, BLADE ANGLING SPEED IS SLOW (FOR POWER ANGLE AND TILTDOZER) 422
10 BLADE ANGLE CYLINDER DOES NOT MOVE (ANGLING IS IMPOSSIBLE) (FOR POWER ANGLE AND TILTDOZER) 423
11 BLADE RETURNS STRAIGHTLY OR MOVES UNSTEADILY WHEN LOADING BY ANGLING (CONTROL LEVER AT HOLD ) (FOR POWER ANGLE AND TILTDOZER) 424
12 LIFT ARM LACKS LIFTING POWER AND LIFTING SPEED IS SLOW 425
13 LIFT ARM DOES NOT RISE, THE FRONT OF MACHINE CANNOT BE RAISED OFF GROUND WHEN LOWERING THE BUCKET 426
14 HYDRAULIC DRIFT OF BUCKET LIFT CYLINDER IS EXCESSIVE 427
15 BUCKET LACKS TILT BACK POWER AND BUCKET TILT SPEED IS SLOW 428
16 BUCKET DUMP CYLINDER DOES NOT MOVE (BUCKET TILT BACK IS IMPOSSIBLE) 429
17 BUCKET DUMP CYLINDER DOES NOT MOVE (DUMPING IS IMPOSSIBLE), MACHINE CANNOT BE RAISED OFF GROUND BY THE DUMP CYLINDER 430
18 BUCKET DUMP SPEED IS SLOW 431
19 HYDRAULIC DRIFT OF BUCKET DUMP CYLINDER IS EXCESSIVE 432
20 BUCKET MOVES UP AND DOWN ALONG GROUND AND LIFT ARM MOVES UNSTEADILY WHEN LEVELING THE GROUND (CONTROL LEVER AT HOLD) 433
21 LIFT ARM LOWERS UNDER THE FOLLOWING CONDITIONS 433
22 BUCKET MOVES UNSTEADILY WHEN LEVELING THE GROUND WITH MACHINE TRAVELING IN REVERSE (CONTROL LEVER AT HOLD) 433
23 BUCKET DUMPS 433
24 LIFT ARM CANNOT BE RAISED WHEN BUCKET DUMPS FULLY 433
25 OPERATING FORCE OF WORK EQUIPMENT CONTROL LEVER IS HEAVY 434
63 DISASSEMBLY AND ASSEMBLY 435
HYDRAULIC PUMP 436
REMOVAL AND INSTALLATION 436
HYDRAULIC CONTROL VLAVE 436
REMOVAL AND INSTALLATION 436
DISASSEMBLY (D20,21A,E-6,D20,21P-6A,B) 438
ASSEMBLY (D20,21A,E-6,D20,21P-6A,B) 440
DISASSEMBLY (D20,21P,PL-6) 442
ASSEMBLY (D20,21P,PL-6) 444
DISASSEMBLY (D20,21S,Q-6) 446
ASSEMBLY (D20,21S,Q-6) 448
BLADE LIFT CYLINDER 450
REMOVAL AND INSTALLATION 450
BLADE ANGLE CYLINDER 450
REMOVAL AND INSTALLATION 450
BLADE TILT CYLINDER 452
REMOVAL AND INSTALLATION 452
BUCKET LIFT CYLINDER 454
REMOVAL AND INSTALLATION 454
BUCKET DUMP CYLINDER 454
REMOVAL AND INSTALLATION 454
HYDRAULIC CYLINDER 456
DISASSEMBLY 456
ASSEMBLY 458
64 MAINTENANCE STANDARD 460
HYDRAULIC CONTROL VALVE (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B 461
HYDRAULIC CONTROL VALVE (D20,21P,PL,PLL-6) 463
HYDRAULIC CONTROL VALVE (D20,21S,Q-6 D21S-6A) 465
HYDRAULIC CYLINDER (D20,21A,E,P-6) 467
HYDRAULIC CYLINDER (D20,21S,Q-6,D21S-6A) 469
HYDRAULIC PUMP 470
70 WORK EQUIPMENT 471
71 STRUCTURE AND FUNCTION 471
POWER ANGLE AND TILTDOZER (D20,21A-6,D20,21P-6A) 472
STRAIGHT TILTDOZER (D20,21P,PL,PLL-6) 474
BUCKET AND LINK (D20,21S,Q-6) 476
73 DISASSEMBLY AND ASSEMBLY 478
WORK EQUIPMENT 479
REMOVAL AND INSTALLATION 479
BLADE 481
REMOVAL AND INSTALLATION 481
WORK EQUIPMENT 483
REMOVAL AND INSTALLATION 483
BUCKET 483
REMOVAL AND INSTALLATION 483
74 MAINTENANCE STANDARD 485
POWER ANGLE AND TILTDOZER (D20,21A-6,D21E-6,D20,21P-6A,D21P-6B) 486
STRAIGHT TILTDOZER (D20,21P,PL,PLL-6) 488
BUCKET LINK (D20,21S,Q-6,D21S-6A) 490
80 ELECTRICAL SYSTEM 492
81 STRUCTURE AND FUNCTION 492
WIRING DIAGRAM 493

DESCRIPTION:

Komatsu Bulldozer D20A-6 D20P-6 D20S-6, D20Q-6 D21A-6 D21P-6 D21S-6 D21Q-6 Shop Manual SEBM01040604 – PDF DOWNLOAD 

GENERAL PRECAUTIONS :

Mistakes in operation are extremely dangerous. Read the OPERATION & MAINTENANCE MANUAL carefully BEFORE operating the machine.

PREPARATIONS FOR WORK:

PRECAUTIONS DURING WORK :

S.V 26/12/24