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Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual – PDF DOWNLOAD
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Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual
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Description
Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual
FILE DETAILS:
Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual
Brands: Komatsu
Equipment Type: Crawler Bulldozer
Manuals Type: Shop Manual
Machine Model: D20A-6, D20P-6, D20P-6A, D20PL-6, D20PLL-6, D20S-6, D20Q-6, D21A-6, D21E-6, D21P-6, D21P-6A, D21P-6B, D21PL-6, D21S-6, D21S-6A, D21Q-6
Serial Number: 60001 and up
Book Code: SEBM01040604
Language: English
Pages: 493
File Format: Portable Document Format (PDF)
DESCRIPTION:
Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual
FOREWORD:
- 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 chapters for each main group of components; these chapters are further divided into the following sections.
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.
TABLE OF CONTENTS:
Komatsu D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 Dozer Shop Manual
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
KOMATSU D20A-6, D20P-6, D20PL-6, D20S-6, D21A-6, D21E-6 D21P-6 D21S-6 DOZER SHOP MANUAL – PDF DOWNLOAD:
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