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Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual – PDF DOWNLOAD
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Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual
Book Code: SEBM025608
MACHINE MODEL SERIAL No.
D31EX-21 50001 and up
D31PX-21 50001 and up
D37EX-21 5001 and up
D37PX-21 5001 and up
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Description
Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual
FILE DETAILS:
Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual
Brands: Komatsu
Equipment Type: Crawler Bulldozer
Manuals Type: Shop Manual
Machine Model: D31EX-21, D31PX-21, D37EX-21, D37PX-21
Serial Number: 50001 and up, 5001 and up
Book Code: SEBM025608
Language: English
Pages: 465
File Format: Portable Document Format (PDF)
DESCRIPTION:
Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual
How to read the shop manual:
1. Composition of shop manual::
This shop manual contains the necessary technical information for services performed in a workshop.
For ease of understanding, the manual is divided into the following sections.
00. Index and foreword:
This section explains the shop manuals list, table of contents, safety, and basic information.
01. Specification:
This section explains the specifications of the machine.
10. Structure, function and maintenance standard:
This section explains the structure, function, and maintenance standard values of each component. The structure and function sub-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. The maintenance standard sub-section explains the criteria and remedies for disassembly and service.
20. Standard value table:
This section explains the standard values for new machine and judgement criteria for testing, adjusting, and troubleshooting. This standard value table is used to check the standard values in testing and adjusting and to judge parts in troubleshooting.
30. Testing and adjusting:
This section explains measuring instruments and measuring methods for testing and adjusting, and method of adjusting each part. The standard values and judgement criteria for testing and adjusting are explained in Testing and adjusting.
40. Troubleshooting:
This section explains how to find out failed parts and how to repair them. The troubleshooting is divided by failure modes. The “S mode” of the troubleshooting related to the engine may be also explained in the Chassis volume and Engine volume. In this case, see the Chassis volume.
50. Disassembly and assembly:
This section explains the special tools and procedures for removing, installing, disassembling, and assembling each component, as well as precautions for them. In addition, tightening torque and quantity and weight of coating material, oil, grease, and coolant necessary for the work are also explained.
90. Diagrams and drawings (chassis volume)/Repair and replacement of parts (engine volume):
- Chassis volume
This section gives hydraulic circuit diagrams and electrical circuit diagrams. - Engine volume
This section explains the method of reproducing, repairing, and replacing parts.
TABLE OF CONTENTS:
Komatsu D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 and up Bulldozer Shop Manual
COVER................................................................................................................................................................. 1 CONTENTS.............................................................................................................................................................. 2 01 GENERAL............................................................................................................................................................ 35 SPECIFICATION DRAWING............................................................................................................................................. 36 SPECIFICATIONS.................................................................................................................................................... 38 WEIGHT TABLE...................................................................................................................................................... 46 TABLE OF FUEL, COOLANT AND LUBRICANTS............................................................................................................................. 48 10 STRUCTURE AND FUNCTION, MAINTENANCE STANDARD....................................................................................................................... 49 COOLING SYSTEM.................................................................................................................................................... 50 ENGINE CONTROL.................................................................................................................................................... 51 POWER TRAIN....................................................................................................................................................... 52 POWER TRAIN SYSTEM................................................................................................................................................ 53 HST HYDRAULIC EQUIPMENT ARRANGEMENT DIAGRAM....................................................................................................................... 54 STEERING, BRAKE CONTROL........................................................................................................................................... 55 DAMPER............................................................................................................................................................ 59 SOLENOID VALVE.................................................................................................................................................... 60 FINAL DRIVE....................................................................................................................................................... 62 HST PUMP.......................................................................................................................................................... 65 SAFETY-SUCTION VALVE.............................................................................................................................................. 70 CUT-OFF VALVE..................................................................................................................................................... 73 CHARGE SAFETY VALVE............................................................................................................................................... 74 CHARGE PUMP....................................................................................................................................................... 76 HST BRAKE QUICK RETURN CIRCUIT.................................................................................................................................... 77 TOWING VALVE...................................................................................................................................................... 78 PARKING BRAKE VALVE............................................................................................................................................... 79 AS VALVE.......................................................................................................................................................... 81 HST MOTOR......................................................................................................................................................... 83 STEERING, DIRECTIONAL PPC VALVE................................................................................................................................... 94 AUTOMATIC GEARSHIFTING VALVE......................................................................................................................................103 INCHING VALVE.....................................................................................................................................................108 FRAME ASSEMBLY....................................................................................................................................................109 TRACK FRAME, RECOIL SPRING........................................................................................................................................110 IDLER.............................................................................................................................................................112 TRACK ROLLER......................................................................................................................................................114 CARRIER ROLLER....................................................................................................................................................116 SPROCKET..........................................................................................................................................................117 TRACK SHOE........................................................................................................................................................119 ARRANGEMENT OF HYDRAULIC EQUIPMENT FOR WORK EQUIPMENT.............................................................................................................123 WORK EQUIPMENT CONTROL............................................................................................................................................124 HYDRAULIC TANK, FILTER............................................................................................................................................126 HYDRAULIC PUMP....................................................................................................................................................127 WORK EQUIPMENT CYLINDER...........................................................................................................................................128 CONTROL VALVE.....................................................................................................................................................130 CLSS..............................................................................................................................................................138 WORK EQUIPMENT PPC VALVE..........................................................................................................................................148 WORK EQUIPMENT ...................................................................................................................................................155 CUTTING EDGE, END BIT.............................................................................................................................................158 CAB RELATED.......................................................................................................................................................159 SAFETY MECHANISM WHEN STARTING ENGINE.............................................................................................................................160 GEARSHIFT CONTROL SYSTEM..........................................................................................................................................161 PARKING BRAKE CONTROL SYSTEM......................................................................................................................................162 COMPONENT EQUIPMENT OF SYSTEM.....................................................................................................................................163 MONITOR SYSTEM....................................................................................................................................................165 SENSORS...........................................................................................................................................................169 20 TESTING AND ADJUSTING..............................................................................................................................................172 STANDARD VALUE TABLE FOR ENGINE...................................................................................................................................173 STANDARD VALUE TABLE FOR CHASSIS..................................................................................................................................175 STANDARD VALUE TABLE FOR ELECTRICAL SYSTEM........................................................................................................................180 TESTING AND ADJUSTING.............................................................................................................................................182 TOOLS LIST FOR TESTING AND ADJUSTING..........................................................................................................................183 MEASURING ENGINE SPEED........................................................................................................................................186 MEASURING EXHAUST COLOR.......................................................................................................................................187 MEASURING BLOW-BY PRESSURE....................................................................................................................................188 MEASURING INTAKE AIR PRESSURE (BOOST PRESSURE)................................................................................................................189 ADJUSTING VALVE CLEARANCE.....................................................................................................................................190 TESTING ADJUSTING FUEL INJECTION TIMING.......................................................................................................................192 MEASURING COMPRESSION PRESSURE................................................................................................................................193 ADJUSTING ENGINE STOP SOLENOIDE LINKAGE.......................................................................................................................194 MEASURING ENGINE OIL PRESSURE.................................................................................................................................195 BLEEDING AIR FROM FUEL CIRCUIT................................................................................................................................196 REPLACEMENT OF FAN BELT.......................................................................................................................................197 TESTING AND ADJUSTING TENSION OF AIR CONDITIONER COMPRESSOR BELT..............................................................................................199 MEASURING AND ADJUSTING HST OIL PRESSURE......................................................................................................................200 MEASURING SOLENOID VALVE OUTPUT PRESSURE......................................................................................................................206 MEASURING AND ADJUSTING WORK EQUIPMENT MAIN RELIEF PRESSURE...................................................................................................207 MEASURING PPC VALVE OUTPUT PRESSURE...........................................................................................................................209 MEASURING LEAKAGE INSIED CYLINDER.............................................................................................................................210 BLEEDING AIR FROM HYDRAULIC CYLINDERS.........................................................................................................................210 TESTING AND ADJUSTING TRACK SHOE TENSION......................................................................................................................211 TESTING AND ADJUSTING TRAVEL DEVIATION........................................................................................................................212 ADJUSTING FUEL CONTROL LINKAGE................................................................................................................................215 ADJUSTING DECELERATOR PEDAL LINKAGE...........................................................................................................................217 ADJUSTING BRAKE PEDAL LINKAGE.................................................................................................................................218 ADJUSTING STEERING/DIRECTIONAL/GEAR SHIFT LEVER AND LOCK LEVER................................................................................................219 ADJUSTING BLADE CONTROL LEVER AND LOCK LEVER..................................................................................................................222 ADJUSTING WORK EQUIPMENT PPC VALVE............................................................................................................................223 PROCEDURE FOR RELEASING PARKING BRAKE.........................................................................................................................224 PROCEDURE FOR INSPECTING DIODE................................................................................................................................226 TROUBLESHOOTING...................................................................................................................................................227 POINTS TO REMEMBER WHEN TROUBLESHOOTING.......................................................................................................................228 SEQUENCE OF EVENTS IN TROUBLESHOOTING.........................................................................................................................229 HANDLING OF ELECTRIC EQUIPMENT AND HYDRAULIC COMPONENT........................................................................................................230 CHECKS BEFORE TROUBLESHOOTING.................................................................................................................................240 METHOD OF USING TROUBLESHOOTING CHARTS........................................................................................................................241 TYPES AND LOCATIONS OF CONNECTORS.............................................................................................................................242 CONNECTOR ARRANGEMENT DIAGRAM.................................................................................................................................244 CONNECTION TABLE FOR CONNECTOR PIN NUMBERS....................................................................................................................246 T-BRANCH BOX AND T-BRANCH ADAPTER TABLE.......................................................................................................................282 TROUBLESHOOTING FOR ELECTRICAL SYSTEM (E-MODE)................................................................................................................285 TABLE OF FAILURE MODES AND CAUSES (ELECTRICAL SYSTEM).....................................................................................................286 ELECTRICAL CIRCUIT DIAGRAM FOR EACH SYSTEM................................................................................................................288 E-1. WHEN STARTING SWITCH IS TURNED ON, STARTING MOTOR DOES NOT ROTATE....................................................................................290 E-2. ENGINE DOES NOT START (ENGINE STOP SOLENOID DOES NOT OPERATE NORMALLY)...............................................................................292 E-3. HEADLAMP DOES NOT LIGHT UP...........................................................................................................................293 E-4. WHEN STARTING SWITCH IS TURNED TO HEAT POSITION, ENGINE IS NOT HEATED................................................................................295 E-5. WINDSHIELD WIPER DOES NOT OPERATE....................................................................................................................296 E-6. WASHING WATER DOES NOT SPOUT.........................................................................................................................298 E-7. AIR CONDITIONER DOES NOT WORK........................................................................................................................300 a) AIR DOES NOT BLOW OUT..............................................................................................................................300 b) AIR IS NOT COOLED..................................................................................................................................303 E-8. PARKING BRAKE CANNOT BE RELEASED (PARKING BRAKE SOLENOID DOES NOT OPERATE)...........................................................................307 E-9. TRAVEL SPEED CONTROL IS ABNORMAL.....................................................................................................................308 a) WHEN GEAR SHIFT SWITCH IS PRESSED,GEAR SPEED DOES NOT CHANGE OR GEAR SPEED CHANGES BY ITSELF (GEAR SHIFT SWITCH OR CONTROLLER IS ABNORMAL).........308 b) GEAR SPEED CANNOT BE SELECTED NORMALLY (TRAVEL SPEED CHANGEOVER SOLENOID IS ABNORMAL)..............................................................309 E-10. BACKUP ALARM DOES NOT SOUND DURING REVERSE TRAVEL...................................................................................................311 E-11. HORN DOES NOT SOUND.................................................................................................................................313 TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL SYSTEM (H-MODE)..................................................................................................314 TABLE OF FAILURE MODES AND CAUSES (HYDRAULIC AND MECHANICAL SYSTEMS)......................................................................................315 H-1. MACHINE DOES NOT TRAVEL IN EITHER DIRECTION OR IT STOPS SUDDENLY.....................................................................................317 H-2. MACHINE DOES NOT TRAVEL IN ONE DIRECTION.............................................................................................................318 H-3. MACHINE TRAVELS WHILE TRAVEL LEVER IS IN NEUTRAL.....................................................................................................318 H-5. MACHINE DEVIATES WHILE TRAVEL LEVER IS IN PARTIAL POSITION...........................................................................................318 H-7. MACHINE SWHINGS MOMENTARILY WHEN IT STARTS ON FLAT GROUND............................................................................................318 H-11. TURNING TIME LAG IS LARGE...........................................................................................................................318 H-12. WHEN OPERATOR INTENDS TO TURN GARDUALLY, MACHINE TURNS SHARPLY......................................................................................318 H-13. MACHINE DOES NOT RETURN QUICKLY TO STRAIGHT TRAVEL POSITION.........................................................................................318 H-14. MACHINE IS NOT DECELERATED SMOOTHLY OR TRAVEL SPEED CANNOT BE CONTROLLED ON DOWNHILL GROUND.........................................................318 H-15. MACHINE DEVIATES WHEN IT IS DECELERATED.............................................................................................................318 H-4. MACHINE DEVIATES WHEN TRAVEL LEVER IS MOVED TO STROKE END............................................................................................319 H-6. MACHINE MOVES BACK WHEN OPERATOR STARTS ON UPHILL GROUND.............................................................................................319 H-8. MACHINE STARTS SHARPLY...............................................................................................................................319 H-9. MACHINE SWINGS MOMENTARLLY WHEN IT STARTS............................................................................................................320 H-10. STARTING TIME LAG IS LARGE..........................................................................................................................321 H-16. MAXIMUM TRAVEL SPEED IS LOW OR OUTPUT POWER IS INSUFFICIENT OR ACCELERATION IS LOW..................................................................322 H-17. ENGINE STALLS.......................................................................................................................................323 H-18. HST NOISE IS LARGE..................................................................................................................................324 H-19. HST OIL TEMPERATURE RISES TOO HIGH..................................................................................................................325 H-20. GEAR SPEED DOES NOT CHANGE..........................................................................................................................325 H-21. ABNORMAL SOUND IS HEARD FROM AROUND WORK EQUIPMENT PUMP OR HST PUMP.................................................................................326 H-22. ANY WORK EQUIPMENT DOES NOT MOVE....................................................................................................................326 H-23. SPEED OR POWER OF EACH WORK EQUIPMENT IS LOW........................................................................................................327 H-24. SPEED OR POWER OF BLADE LIFT OF BLADE TILT CYLINDER IS LOW..........................................................................................327 H-25. SPEED OR POWER OF BLADE ANGLE CYLINDER IS LOW.......................................................................................................328 H-26. HYDRAULIC DRIFT OF BLADE LIFT CYLINDER IS LARGE.....................................................................................................329 H-27. HYDRAULIC DRIFT OF BLADE TILT CYLINDER IS LARGE.....................................................................................................329 H-28. HYDRAULIC DRIFT OF BLADE ANGLE CYLINDER IS LARGE....................................................................................................330 TROUBLESHOOTING FOR MACHINE MONITOR SYSTEM (M-MODE)...........................................................................................................331 TABLE OF FAILURE MODES AND CAUSES (MACHINE MONITOR SYSTEM)................................................................................................332 ELECTRIC CIRCUIT DIAGRAM FOR EACH SYSTEM..................................................................................................................333 M-1. WHEN STARTING SWITCH IS TURNED ON , MONITOR PANEL IS NOT TURNED ON...................................................................................335 M-2. TROUBLE IN PREHEATING CAUTION LAMP...................................................................................................................336 a) PREHEATING MONITOR DOES NOT LIGHT UP...............................................................................................................336 b) PREHEATING MONITOR KEEPS LIGHTING UP...............................................................................................................336 M-3. CAUTION ITEM LIGHTS UP...............................................................................................................................337 a) CHARGE CAUTION LAMP LIGHTS UP WHILE ENGINE IS RUNNING..............................................................................................337 b) OIL PRESSURE CAUTION LAMP LIGHTS UP WHILE ENGINE IS RUNNING........................................................................................338 c) HST FILTER CLOGGING CAUTION LAMP LIGHTS UP (WHILE FILTER IS NOT CLOGGED)...........................................................................338 M-4. TROUBLE IN HST OIL TEMPERATURE GAUGE.................................................................................................................339 a) GAUGE DOES NOT RISE ABOVE C (LOWEST POINT).........................................................................................................339 b) GAUGE DOES NOT LOWER BELOW H (HIGHEST POINT).......................................................................................................339 c) HST OIL TEMPERATURE INDICATED BY GAUGE IS DIFFERENT FROM ACTUAL TEMPERATURE........................................................................340 M-5. TROUBLE IN ENGINE WATER TEMPERATURE GAUGE............................................................................................................341 a) GAUGE DOES NOT RISE ABOVE C (LOWEST POINT).........................................................................................................341 b) GAUGE DOES NOT LOWER BELOW H (HIGHEST POINT).......................................................................................................341 c) ENGINE WATER TEMPERATURE INDICATED BY GAUGE IS DIFFERENT FROM ACTUAL TEMPERATURE...................................................................342 M-6. TROUBLE IN FUEL LEVEL GAUGE..........................................................................................................................343 a) GAUGE DOES NOT RISE ABOVE E (LOWEST POINT).........................................................................................................343 b) GAUGE DOES NOT LOWER BELOW F (HIGHEST POINT).......................................................................................................343 c) FUEL LEVEL INDICATED BY GAUGE IS DIFFERENT FROM ACTUAL LEVEL.......................................................................................344 M-7. SERVICE METER DOES NOT OPERATE AFTER ENGINE IS STARTED...............................................................................................345 M-8. MONITOR PANEL LAMP DOES NOT LIGHT UP (WHILE HEADLAMP IS NORMAL)......................................................................................346 M-9. TROUBLE IN DISPLAY OF TRAVEL SPEED (WHILE ACTUAL TRAVEL SPEED IS NORMAL).............................................................................347 a) TRAVEL SPEED IS NOT DISPLAYED......................................................................................................................347 b) DISPLAYED SPEED IS DIFFERENT FROM ACTUAL TRAVEL SPEED..............................................................................................347 TROUBLESHOOTING FOR 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 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 LACKS OUTPUT (OR LACKS 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 COOLANT, OR COOLANT SPURTS BACK, OR COOLANT 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 COOLANT TEMPERATURE BECOMES TOO HIGH (OVERHEATING)...................................................................................................369 S-15 ABNORMAL NOISE IS MADE...............................................................................................................................370 S-16 VIBRATION IS EXCESSIVE...............................................................................................................................371 30 DISASSEMBLY AND ASSEMBLY...........................................................................................................................................373 HOW TO READ THIS MANUAL...........................................................................................................................................374 COATING MATERIALS LIST............................................................................................................................................376 SPECIAL TOOL LIST.................................................................................................................................................379 SKETCHES OF SPECIAL TOOLS.........................................................................................................................................381 REMOVAL OF FUEL INJECTION PUMP ASSEMBLY...........................................................................................................................382 INSTALLATION OF FUEL INJECTION PUMP ASSEMBLY......................................................................................................................384 REMOVAL OF CYLINDER HEAD ASSEMBLY.................................................................................................................................386 INSTALLATION OF CYLINDER HEAD ASSEMBLY............................................................................................................................391 REMOVAL OF ENGINE FRONT SEAL......................................................................................................................................393 INSTALLATION OF ENGINE FRONT SEAL.................................................................................................................................394 REMOVAL OF ENGINE REAR SEAL.......................................................................................................................................395 INSTALLATION OF ENGINE REAR SEAL..................................................................................................................................396 REMOVAL OF RADIATOR GUARD ASSEMBLY................................................................................................................................397 INSTALLATION OF RADIATOR GUARD ASSEMBLY...........................................................................................................................399 DISASSEMBLY OF RADIATOR, OIL COOLER, AND CHARGE AIR COOLER ASSEMBLIES.............................................................................................400 ASSEMBLY OF RADIATOR, OIL COOLER, AND CHARGE AIR COOLER ASSEMBLIES................................................................................................402 REMOVAL OF ENGINE ASSEMBLY........................................................................................................................................404 INSTALLATION OF ENGINE ASSEMBLY...................................................................................................................................406 REMOVAL OF DAMPER.................................................................................................................................................407 INSTALLATION OF DAMPER............................................................................................................................................407 REMOVAL OF TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY..................................................................................................................408 INSTALLATION OF TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY.............................................................................................................409 DISASSEMBLY OF TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY..............................................................................................................410 ASSEMBLY OF TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY.................................................................................................................414 REMOVAL OF IDLER AND RECOIL SPRING ASSEMBLY.......................................................................................................................419 INSTALLATION OF IDLER AND RECOIL SPRING ASSEMBLY..................................................................................................................419 DISASSEMBLY OF RECOIL SPRING ASSEMBLY.............................................................................................................................420 ASSEMBLY OF RECOIL SPRING ASSEMBLY................................................................................................................................421 DISASSEMBLY OF IDLER ASSEMBLY.....................................................................................................................................423 ASSEMBLY OF IDLER ASSEMBLY........................................................................................................................................424 DISASSEMBLY OF TRACK ROLLER ASSEMBLY..............................................................................................................................426 ASSEMBLY OF TRACK ROLLER ASSEMBLY.................................................................................................................................427 DISASSEMBLY OF CARRIER ROLLER ASSEMBLY............................................................................................................................430 ASSEMBLY OF CARRIER ROLLER ASSEMBLY...............................................................................................................................431 SPREADING TRACK SHOE ASSEMBLY.....................................................................................................................................432 INSTALLATION OF TRACK SHOE ASSEMBLY...............................................................................................................................433 REMOVAL OF HST PUMP ASSEMBLY......................................................................................................................................434 INSTALLATION OF HST PUMP ASSEMBLY.................................................................................................................................435 REMOVAL OF MAIN CONTROL VALVE ASSEMBLY............................................................................................................................436 INSTALLATION OF MAIN CONTROL VALVE ASSEMBLY.......................................................................................................................437 DISASSEMBLY OF MAIN CONTROL VALVE ASSEMBLY........................................................................................................................438 ASSEMBLY OF MAIN CONTROL VALVE ASSEMBLY...........................................................................................................................442 DISASSEMBLY OF HYDRAULIC CYLINDER ASSEMBLIES......................................................................................................................446 ASSEMBLY OF HYDRAULIC CYLINDER ASSEMBLIES.........................................................................................................................447 REMOVAL OF BLADE ASSEMBLY.........................................................................................................................................449 INSTALLATION OF BLADE ASSEMBLY....................................................................................................................................450 REMOVAL OF OPERATOR'S SEAT TRAME ASSEMBLY.........................................................................................................................451 INSTALLATION OF OPERATOR'S SEAT FRAME ASSEMBLY....................................................................................................................454 REMOVAL OF FUEL TANK ASSEMBLY.....................................................................................................................................455 INSTALLATION OF FUEL TANK ASSEMBLY................................................................................................................................455 REMOVAL OF HYDRAULIC TANK ASSEMBLY................................................................................................................................456 INSTALLATION OF HYDRAULIC TANK ASSEMBLY...........................................................................................................................457 90 OTHERS.............................................................................................................................................................458 HYDRAULIC CIRCUIT DIAGRAM (1/2)(D31EX-21 SERIAL NO.50001-50097 D31PX-21 SERIAL NO.50001-50181 D37EX-21 SERIAL NO. 5001-5104 D37PX-21 SERIAL NO. 5001-5090)........459 HYDRAULIC CIRCUIT DIAGRAM (1/2)(D31EX-21 SERIAL NO.50098 AND UP D31PX-21 SERIAL NO.50182 AND UP D37EX-21 SERIAL NO.5105 AND UP D37PX-21 SERIAL NO.5091 AND UP)....460 HYDRAULIC CIRCUIT DIAGRAM (2/2)...................................................................................................................................461 HYDRAULIC CIRCUIT DIAGRAM (2/2) (FOR D37EX, PX-21 EU SPEC.).......................................................................................................462 ELECTRICAL CIRCUIT DIAGRAM (1/2)..................................................................................................................................463 ELECTRICAL CIRCUIT DIAGRAM (2/2)..................................................................................................................................464 ELECTRICAL CIRCUIT DIAGRAM FOR AIR CONDITIONER....................................................................................................................465
KOMATSU D31EX-21, D31PX-21, D37EX-21, D37PX-21 50001, 5001 AND UP BULLDOZER SHOP MANUAL – PDF DOWNLOAD:
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