KOMATSU D155A-2 SERVICE MANUAL SN57001 & up – PDF DOWNLOAD

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KOMATSU D155A-2 SERVICE MANUAL SN57001 & up – PDF DOWNLOAD

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KOMATSU D155A-2 SERVICE MANUAL SN57001 & up – PDF DOWNLOAD

Language : English
Pages : 462
Downloadable : Yes
File Type : PDF

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TABLE OF CONTENTS:

KOMATSU D155A-2 SERVICE MANUAL SN57001 & up – PDF DOWNLOAD

COVER.........................................................................................................................................................  1
CONTENTS......................................................................................................................................................  2
01 GENERAL.................................................................................................................................................... 25
	SPECIFICATION DRAWING..................................................................................................................................... 26
	SPECIFICATIONS............................................................................................................................................ 27
	WEIGHT TABLE.............................................................................................................................................. 32
	TABLE OF FUEL,COOLANT AND LUBRICANTS...................................................................................................................... 34
10 STRUCTURE AND FUNCTION..................................................................................................................................... 35
	ENGINE CONTROL............................................................................................................................................ 36
	RADIATOR,OIL COOLER....................................................................................................................................... 37
	PTO....................................................................................................................................................... 39
	POWER TRAIN............................................................................................................................................... 41
	POWER TRAIN SYSTEM........................................................................................................................................ 43
	POWER TRAIN HYDRAULIC PIPING DIAGRAM...................................................................................................................... 44
	POWER TRAIN HYDRAULIC CIRCUIT DIAGRAM..................................................................................................................... 45
	TORQUE CONVERTER.......................................................................................................................................... 47
	TRANSMISSION CONTROL...................................................................................................................................... 52
	TRANSMISSION.............................................................................................................................................. 53
	TRANSMISSION CONTROL VALVE................................................................................................................................ 61
	TRANSMISSION LUBRICATION RELIEF VALVE..................................................................................................................... 69
	STEERING CONTROL.......................................................................................................................................... 70
	BEVEL GEAR SHAFT AND STEERING CLUTCH...................................................................................................................... 71
	STEERING MAIN RELIEF VALVE................................................................................................................................ 74
	STEERING BRAKE ........................................................................................................................................... 75
	STEERING AND BRAKE CONTROL VALVE.......................................................................................................................... 79
	SPRING ASSIST BRAKE SYSTEM................................................................................................................................ 84
	FINAL DRIVE............................................................................................................................................... 89
	TRACK FRAME............................................................................................................................................... 93
	RECOIL SPRING............................................................................................................................................. 94
	SUSPENSION................................................................................................................................................ 95
	WORK EQUIPMENT HYDRAULIC PIPING DIAGRAM................................................................................................................... 96
	WORK EQUIPMENT CONTROL....................................................................................................................................100
	WORK EQUIPMENT HYDRAULIC CIRCUIT DIAGRAM..................................................................................................................102
	HYDRAULIC TANK............................................................................................................................................103
	ROTARY SERVO VALVE........................................................................................................................................104
	PISTON VALVE..............................................................................................................................................108
	PIN PULLER SWITCH.........................................................................................................................................109
	PIN-PULLER SOLENOID VALVE.................................................................................................................................110
	MAIN CONTROL VALVE........................................................................................................................................112
	RIPPER SELECTOR VALVE AND PILOT CHECK VALVE...............................................................................................................116
	PILOT SOLENOID VALVE......................................................................................................................................120
	CYLINDER STAY.............................................................................................................................................121
	WORK EQUIPMENT............................................................................................................................................122
	CAB.......................................................................................................................................................125
	AIR CONDITIONER...........................................................................................................................................126
	ACTUAL ELECTRIC WIRING DIAGRAM............................................................................................................................127
	MONITOR SYSTEM............................................................................................................................................129
	SENSOR....................................................................................................................................................134
20 TESTING AND ADJUSTING......................................................................................................................................138
	STANDARD VALUE TABLE FOR FUNCTIONS RELEVANT TO THE ENGINE.................................................................................................139
	STANDARD VALUE TABLE FOR FUNCTIONS RELEVANT TO THE MACHINE BODY...........................................................................................140
	STANDARD VALUE TABLE FOR ELECTRIC EQUIPMENT AND PARTS.....................................................................................................144
	TESTING AND ADJUSTING ....................................................................................................................................145
		LIST OF EQUIPMENT,PARTS AND TOOLS NECESSARY FOR INSPECTIONS,ADJUSTMENTS AND FOR TROUBLESHOOTING.......................................................146
		MEASURING THE ENGINE REVOLUTION.......................................................................................................................147
		MEASURING THE INTAKE MANIFOLD PRESSURE (BOOST PRESSURE)...............................................................................................148
		MEASURING THE EXHAUST TEMPERATURE.....................................................................................................................149
		MEASURING THE EXHAUST GAS COLOR.......................................................................................................................150
		ADJUSTING THE VALVE CLEARANCE.........................................................................................................................151
		MEASURING THE COMPRESSION PRESSURE....................................................................................................................152
		MEASURING THE BLOWBY PRESSURE.........................................................................................................................153
		MEASURING THE ENGINE OIL PRESSURE.....................................................................................................................154
		INSPECTING AND ADJUSTING THE FUEL INJECTION TIMING....................................................................................................155
		INSPECTING AND ADJUSTING THE ALTERNATOR BELT TENSION..................................................................................................156
		INSPECTING AND ADJUSTING THE AIR COMPRESSOR BELT TENSION..............................................................................................156
		MEASURING THE TORQUE CONVERTER STALLING REVOLUTION RATE...............................................................................................157
		MEASURING THE TORQUE CONVERTER STALLING + WORK EQUIPMENT PUMP RELIEVING REVOLUTION RATE (FULL STALL REVOLUTION RATE)..................................158
		MEASURING THE OIL PRESSURE............................................................................................................................159
		ADJUSTING THE STROKES AND LINKAGES....................................................................................................................161
	TROUBLESHOOTING...........................................................................................................................................173
		POINTS TO REMEMBER WHEN TROUBLESHOOTING...............................................................................................................174
		SEQUENCE OF EVENTS IN TROUBLESHOOTING.................................................................................................................175
		POINTS TO REMEMBER WHEN CARRYING OUT MAINTENANCE......................................................................................................176
		CHECKS BEFORE TROUBLESHOOTING.........................................................................................................................184
		CONNECTOR TYPES AND CONNECTING EQUIPMENT AND PART NAMES...............................................................................................185
		CONNECTION TABLE FOR CONNECTOR PIN NUMBERS............................................................................................................189
		HOW TO FOLLOW THE TROUBLESHOOTING FLOW DIAGRAMS.......................................................................................................195
		TROUBLESHOOTING FOR ELECTRIC EQUIPMENT (E-MODE).......................................................................................................197
			ELECTRIC CIRCUIT DIAGRAM FOR THE E-MODE SYSTEM CIRCUITS...........................................................................................198
			E-1 THE ENGINE DOES NOT START.(IN CASE THE ENGINE DOES NOT ROTATE)................................................................................199
			E-2 THE LAMPS DO NOT TURN ON......................................................................................................................202
				a) HEAD LAMPS.................................................................................................................................202
				b) WORKING LAMP...............................................................................................................................203
				c) REAR LAMP..................................................................................................................................204
			E-3 PRE-HEATING CANNOT BE EFFECTED................................................................................................................205
			E-4 THE BACKING ALARM DOES NOT SOUND..............................................................................................................206
			E-5 THE PIN PULLER CYLINDER CANNOT BE ACTIVATED (WITH MACHINES EQUIPPED WITH THE GIANT RIPPER)....................................................207
				a) THE PIN CANNOT BE PULLED OUT. (THE SOLENOID CANNOT BE EXCITED.)............................................................................207
				b) THE PIN CANNOT BE PUSHED IN. (THE SOLENOID CANNOT BE DEMAGNETIZED.)........................................................................207
		TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL EQUIPMENT (H-MODE).......................................................................................209
			HOW TO PROCEED WITH THE TROUBLESHOOTING...........................................................................................................210
			H-1 TORQUE CONVERTER OIL TEMPERATURE IS TOO HIGH..................................................................................................212
			H-2 THE MACHINE WOULD NOT START TRAVELING.........................................................................................................213
			H-3 THE TRACKING FORCE IS TOO WEAK OR THE TRAVELING SPEED IS TOO SLOW.............................................................................214
			H-4 THE MACHINE MOVES FORWARD OR BACKWARD WHEN THE ENGINE IS STARTED..............................................................................215
			H-5 STARTING OR SPEED SHIFTING TIME LAG IS TOO LONG...............................................................................................215
			H-6 STARTING OR SPEED SHIFTING SHOCK IS TOO BIG...................................................................................................216
			H-7 THE MACHINE TRAVELS ONLY IN THE FORWARD DIRECTION OR IN REVERSE DIRECTION.....................................................................216
			H-8 THE STEERING CLUTCH CANNOT BE DISENGAGED......................................................................................................217
			H-9 THE STEERING CLUTCH SLIPS.....................................................................................................................218
			H-10 THE STEERING BRAKE IS NOT EFFECTIVE..........................................................................................................219
			H-11 THE BLADE LIFTING POWER AND SPEED ARE INSUFFICIENT...........................................................................................220
			H-12 THE BLADE CANNOT BE LIFTED...................................................................................................................221
			H-13 THE MACHINE BODY CANNOT BE RAISED BY USE OF THE BLADE........................................................................................222
			H-14 HYDRAULIC DRIFT OF THE BLADE LIFT CYLINDER IS EXCESSIVE......................................................................................223
			H-15 THE BLADE SHAKES UNSTEADILY UP AND DOWN WHEN MAKING GROUND LEVELING WORKS (WHILE THE CONTROL LEVER IS BEING SET TO THE "HOLD" POSITION)......224
			H-16 THE BLADE COMES DOWN.........................................................................................................................224
				1) WHEN THE WORK EQUIPMENT CONTROL LEVER IS SHIFTED FROM THE "HOLD" POSITION TO THE "UP" POSITION:............................................224
				2) THE BLADE COMES DOWN GRADUALLY WHEN THE ENGINE IS STOPPED EVEN WHEN THE WORK EQUIPMENT CONTROL LEVER IS BEING SET TO THE "UP" POSITION:....224
			H-17 THE BLADE IS LIFTED WITH ITS LH AND RH END AT UNEVEN ELEVATIONS (WITH THE STRAIGHT-DOZERS ONLY)..............................................224
			H-18 THE MACHINE BODY CANNOT BE RAISED BY TILTING OF THE BLADE OWING TO INSUFFICIENT TILTING FORCE AND SPEED......................................225
			H-19 THE BLADE CANNOT BE TILTED...................................................................................................................226
			H-20 HYDRAULIC DRIFT OF THE BLADE TILT CYLINDER IS EXCESSIVE......................................................................................227
			H-21 HYDRAULIC DRIFT OF THE RIPPER CYLINDER IS EXCESSIVE..........................................................................................228
			H-22 THE OPERATING EFFORTS FOR THE CONTROL LEVER ARE TOO HIGH.....................................................................................229
		TROUBLESHOOTING FOR MONITOR PANEL AND RELATED PARTS (M-MODE)..........................................................................................230
			ELECTRIC CIRCUIT DIAGRAM FOR THE M-MODE SYSTEM CIRCUITS...........................................................................................231
			M-1 THE MONITOR PANEL INDICATIONS DO NOT APPEAR EVEN WHEN THE STARTING SWITCH IS TURNED "ON"......................................................232
				a) WHEN THE MONITOR PANEL INDICATIONS DO NOT APPEAR TOTALLY:..................................................................................232
				b) WHEN THE MONITOR PANEL INDICATIONS APPEAR ONLY PARTLY:.....................................................................................232
			M-2 THE MONITOR PANEL LIGHTS TOTALLY WHEN THE STARTING SWITCH IS TURNED "ON" AND IT CANNOT  BE TURNED OFF.........................................232
			M-3 THE "EVERYDAY CHECKUP ITEMS" FLASH WHEN THE STARTING SWITCH IS TURNED ON (BUT NOT AS FAR AS STARTING THE ENGINE)..............................233
			M-4 THE (PRE-HEATING INDICATION) APPEARS EVEN THOUGH THE PRE-HEATING OPERATION HAS NOT BEEN MADE..................................................234
			M-5 THE "EVERYDAY CHECKUP ITEMS" FLASH WHEN THE STARTING SWITCH IS TURNED ON AND WHEN THE ENGINE IS STARTED.......................................235
				a) ALTERNATOR CIRCUITS........................................................................................................................235
				b) ENGINE OIL PRESSURE CIRCUITS...............................................................................................................235
			M-6 THE CAUTION ITEMS FLASH WHEN THE STARTING SWITCH IS TURNED ON (BUT NOT AS FAR AS STARTING THE ENGINE).........................................236
			M-7 THE CAUTION ITEMS FLASH WHEN THE STARTING SWITCH IS TURNED ON AND WHEN THE ENGINE IS STARTED..................................................237
				a) (ENGINE OIL PRESSURE) FLASHES..............................................................................................................237
				b) (RADIATOR WATER LEVEL) FLASHES.............................................................................................................237
				c) (ENGINE WATER TEMPERATURE) FLASHES.........................................................................................................237
				d) (CHARGING LEVEL) FLASHES...................................................................................................................238
				e) (TORQUE CONVERTER OIL TEMPERATURE) FLASHES.................................................................................................238
			M-8 THE BUZZER DOES NOT SOUND FOR ONE SECOND WHEN THE STARTING SWITCH IS TURNED ON (BUT NOT AS FAR AS STARTING THE ENGINE)........................240
				a) THE BUZZER DOES NOT SOUND EVEN THOUGH THE CAUTION ITEM IS FLASHING.........................................................................240
				b) THE BUZZER SOUNDS EVEN THOUGH NO ALARM IS BEING INDICATED ON THE MONITOR...................................................................240
			M-9 THE LAMP DOES NOT TURN ON FOR TWO SECONDS WHEN THE STARTING SWITCH IS TURNED ON  (BUT NOT AS FAR AS STARTING THE ENGINE)......................241
				a) THE LAMP DOES NOT FLASH EVEN THOUGH THE CAUTION ITEM IS FLASHING...........................................................................241
				b) THE LAMP LIGHTS EVEN THOUGH NO ALARM IS BEING INDICATED ON THE MONITOR.....................................................................241
			M-10 THE PANEL ILLUMINATION DOES NOT TURN ON.(EVEN THOUGH THE LCD INDICATIONS ARE NORMAL.)........................................................242
			M-11 THE SERVICE METER DOES NOT WORK EVEN THOUGH THE ENGINE HAS BEEN STARTED......................................................................243
			M-12 THE ENGINE WATER TEMPERATURE GAUGE IS INDICATING ABNORMALLY LOW TEMPERATURE READING..........................................................244
			M-13 THE ENGINE WATER TEMPERATURE GAUGE IS UNWORKABLE.............................................................................................244
			M-14 THE TORQUE CONVERTER OIL TEMPERATURE GAUGE IS INDICATING ABNORMALLY LOW TEMPERATURE READING..................................................245
			M-15 THE TORQUE CONVERTER OIL TEMPERATURE GAUGE IS UNWORKABLE.....................................................................................245
			M-16 THE FUEL GAUGE ALWAYS INDICATE THE FULL TANK STATE...........................................................................................246
			M-17 THE FUEL GAUGE DOES NOT MAKE INDICATIONS.....................................................................................................246
30 DISASSEMBLY AND ASSEMBLY...................................................................................................................................247
	METHOD OF USING MANUAL....................................................................................................................................249
	PRECAUTIONS WHEN CARRYING OUT OPERATION...................................................................................................................251
	SPECIAL TOOL LIST.........................................................................................................................................253
	FUEL INJECTION PUMP ASSEMBLY..............................................................................................................................258
		REMOVAL...............................................................................................................................................258
		INSTALLATION..........................................................................................................................................258
	CYLINDER HEAD ASSEMBLY....................................................................................................................................259
		REMOVAL...............................................................................................................................................259
		INSTALLATION..........................................................................................................................................263
	RADIATOR GUARD ASSEMBLY...................................................................................................................................266
		REMOVAL...............................................................................................................................................266
		INSTALLATION..........................................................................................................................................267
	RADIATOR,TORQUE CONVERTER OIL COOLER ASSEMBLY.............................................................................................................268
		REMOVAL...............................................................................................................................................268
		INSTALLATION..........................................................................................................................................269
	PTO ASSEMBLY..............................................................................................................................................270
		DISASSEMBLY...........................................................................................................................................270
		ASSEMBLY..............................................................................................................................................271
	FUEL TANK ASSEMBLY........................................................................................................................................273
		REMOVAL...............................................................................................................................................273
		INSTALLATION..........................................................................................................................................274
	ENGINE,TORQUE CONVERTER ASSEMBLY..........................................................................................................................275
		REMOVAL...............................................................................................................................................275
		INSTALLATION..........................................................................................................................................278
	TORQUE CONVERTER ASSEMBLY.................................................................................................................................279
		REMOVAL...............................................................................................................................................279
		INSTALLATION..........................................................................................................................................279
		DISASSEMBLY...........................................................................................................................................280
		ASSEMBLY..............................................................................................................................................284
	TORQUE CONVERTER RELIEF VALVE ASSEMBLY....................................................................................................................289
		DISASSEMBLY...........................................................................................................................................289
		ASSEMBLY..............................................................................................................................................289
	TORQUE CONVERTER REGULATOR VALVE..........................................................................................................................289
		DISASSEMBLY...........................................................................................................................................289
		ASSEMBLY..............................................................................................................................................289
	TRANSMISSION ASSEMBLY.....................................................................................................................................290
		REMOVAL...............................................................................................................................................290
		INSTALLATION..........................................................................................................................................291
	TORQUE FLOW TRANSMISSION ASSEMBLY.........................................................................................................................292
		DISASSEMBLY...........................................................................................................................................292
		ASSEMBLY..............................................................................................................................................303
	TRANSMISSION CONTROL VALVE ASSEMBLY.......................................................................................................................318
		DISASSEMBLY...........................................................................................................................................318
		ASSEMBLY..............................................................................................................................................320
	TRANSMISSION LUBRICATION VALVE ASSEMBLY...................................................................................................................322
		DISASSEMBLY...........................................................................................................................................322
		ASSEMBLY..............................................................................................................................................322
	BEVEL GEAR SHAFT ASSEMBLY.................................................................................................................................323
		DISASSEMBLY...........................................................................................................................................323
		ASSEMBLY..............................................................................................................................................325
	STEERING CLUTCH ASSEMBLY..................................................................................................................................330
		REMOVAL...............................................................................................................................................330
		INSTALLATION..........................................................................................................................................332
		DISASSEMBLY...........................................................................................................................................333
		ASSEMBLY..............................................................................................................................................334
	BRAKE BOOSTER ASSEMBLY....................................................................................................................................335
		DISASSEMBLY...........................................................................................................................................335
		ASSEMBLY..............................................................................................................................................335
	STEERING RELIEF VALVE ASSEMBLY............................................................................................................................336
		DISASSEMBLY...........................................................................................................................................336
		ASSEMBLY..............................................................................................................................................336
	VALVE ASSEMBLY LINKED TO STEERING,BRAKE...................................................................................................................337
		DISASSEMBLY...........................................................................................................................................338
		ASSEMBLY..............................................................................................................................................338
	FIRST PINION ASSEMBLY.....................................................................................................................................339
		DISASSEMBLY...........................................................................................................................................339
		ASSEMBLY..............................................................................................................................................340
	FINAL DRIVE ASSEMBLY......................................................................................................................................341
		DISASSEMBLY...........................................................................................................................................341
		ASSEMBLY..............................................................................................................................................345
	TRACK FRAME ASSEMBLY......................................................................................................................................350
		REMOVAL...............................................................................................................................................350
		INSTALLATION..........................................................................................................................................350
	RECOIL SPRING ASSEMBLY....................................................................................................................................351
		REMOVAL...............................................................................................................................................351
		INSTALLATION..........................................................................................................................................352
		DISASSEMBLY...........................................................................................................................................353
		ASSEMBLY..............................................................................................................................................353
	IDLER ASSEMBLY............................................................................................................................................354
		REMOVAL...............................................................................................................................................354
		INSTALLATION..........................................................................................................................................354
	TRACK SHOE ASSEMBLY.......................................................................................................................................355
		REMOVAL...............................................................................................................................................355
		INSTALLATION..........................................................................................................................................355
		ENTIRE DISASSEMBLY....................................................................................................................................356
		ENTIRE ASSEMBLY.......................................................................................................................................361
	1 LINK IN FIELD...........................................................................................................................................375
		DISASSEMBLY...........................................................................................................................................375
		ASSEMBLY..............................................................................................................................................377
	MASTER LINK...............................................................................................................................................379
		DISASSEMBLY...........................................................................................................................................379
		ASSEMBLY..............................................................................................................................................381
	BLADE,RIPPER CONTROL VALVE ASSEMBLY.......................................................................................................................384
		DISASSEMBLY...........................................................................................................................................385
		ASSEMBLY..............................................................................................................................................385
	BLADE TILT CONTROL VAVLE..................................................................................................................................386
		DISASSEMBLY...........................................................................................................................................386
		ASSEMBLY..............................................................................................................................................386
	RIPPER SELECTOR VALVE ASSEMBLY............................................................................................................................387
		DISASSEMBLY...........................................................................................................................................388
		ASSEMBLY..............................................................................................................................................388
	OIL CYLINDER ASSEMBLY.....................................................................................................................................389
		DISASSEMBLY...........................................................................................................................................389
		ASSEMBLY..............................................................................................................................................391
	PIN PULLER CYLINDER ASSEMBLY..............................................................................................................................393
		DISASSEMBLY...........................................................................................................................................393
		ASSEMBLY..............................................................................................................................................393
	WORK MACHINE ASSEMBLY.....................................................................................................................................394
		REMOVAL...............................................................................................................................................394
		INSTALLATION..........................................................................................................................................394
		DISASSEMBLY...........................................................................................................................................395
		ASSEMBLY..............................................................................................................................................396
	RIPPER ASSEMBLY...........................................................................................................................................397
		DISASSEMBLY...........................................................................................................................................397
		ASSEMBLY..............................................................................................................................................398
	CABIN ASSEMBLY............................................................................................................................................399
		REMOVAL...............................................................................................................................................399
		INSTALLATION..........................................................................................................................................400
	CABIN FLOOR FRAME ASSEMBLY................................................................................................................................401
		REMOVAL...............................................................................................................................................401
		INSTALLATION..........................................................................................................................................402
	FLOOR FRAME ASSEMBLY......................................................................................................................................403
		REMOVAL...............................................................................................................................................403
		INSTALLATION..........................................................................................................................................404
40 MAINTENANCE STANDARD.......................................................................................................................................405
	ENGINE MOUNT..............................................................................................................................................406
	TORQUE CONVERTER..........................................................................................................................................407
	TRANSMISSION..............................................................................................................................................409
	TRANSMISSION CONTROL VALVE................................................................................................................................411
	TRANSMISSION LUBRICATION RELIEF VALVE.....................................................................................................................413
	TRANSMISSION PUMP.........................................................................................................................................414
	BEVEL GEAR SHAFT..........................................................................................................................................415
	STEERING CLUTCH...........................................................................................................................................417
	STEERING PUMP.............................................................................................................................................419
	STEERING MAIN RELIEF VALVE................................................................................................................................420
	STEERING AND BRAKE CONTROL VALVE..........................................................................................................................421
	STEERING BRAKE............................................................................................................................................423
	SPRING ASSIST BRAKE CYLINDER..............................................................................................................................425
	AUTOMATIC DRAIN VALVE.....................................................................................................................................426
	FINAL DRIVE...............................................................................................................................................427
	TRACK FRAME...............................................................................................................................................429
	RECOIL SPRING.............................................................................................................................................430
	LDLER.....................................................................................................................................................431
	TRACK ROLLER..............................................................................................................................................433
	CARRIER ROLLER............................................................................................................................................435
	TRACK SHOE (DRY TYPE).....................................................................................................................................437
	TRACK SHOE (SEALED AND LUBRICATED TYPE)...................................................................................................................440
	SUSPENSION................................................................................................................................................444
	WORK EQUIPMENT PUMP.......................................................................................................................................445
	ROTARY SERVO VALVE (FOR BLADE LIFT).......................................................................................................................446
	MAIN CONTROL VALVE........................................................................................................................................447
	BLADE TILT VALVE..........................................................................................................................................449
	RIPPER SELECTOR VALVE AND PILOT CHECK VALVE...............................................................................................................450
	WORK EQUIPMENT CYLINDER...................................................................................................................................451
	QUICK DROP VALVE..........................................................................................................................................453
	CYLINDER STAY.............................................................................................................................................454
	WORK EQUIPMENT ...........................................................................................................................................455
90 OTHERS.....................................................................................................................................................460
	ELECTRIC CIRCUIT DIAGRAM (SERIAL NO.57001-57284)..........................................................................................................461
	ELECTRIC CIRCUIT DIAGRAM (SERIAL NO.57285 AND UP).........................................................................................................462

DESCRIPTION:

KOMATSU D155A-2 SERVICE MANUAL SN57001 & up – PDF DOWNLOAD

GENERAL
This shop manual has been prepared as an aid to improve the quality of repairs by giving the
serviceman an accurate understanding of the product and by showing him the correct way to perform
repairs and make judgements. Make sure you understand the contents of this manual and use it to full
effect at every opportunity.
This shop manual mainly contains the necessary technical information for operations performed in a
service workshop. For ease of understanding, the manual is divided into the following chapters; these
chapters are further divided into the each main group of components
STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give
an understanding of the structure, but also serves as reference material for troubleshooting.
In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and
maintenance standards.
TESTING AND ADJUSTING
This section explains checks to be made before and after performing repairs, as well as
adjustments to be made at completion of the checks and repairs.
Troubleshooting charts correlating “Problems” 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.
The contents of this section may be described in STRUCTURE AND FUNCTION.
OTHERS
This section mainly gives hydraulic circuit diagrams and electric circuit diagrams.
In addition, this section may give the specifications of attachments and options together.

S.S 12/12/24