Komatsu WA70M-8E0 Wheel Loader Shop Manual VENBM09000 PDF

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Komatsu WA70M-8E0 Wheel Loader Shop Manual VENBM09000  – PDF DOWNLOAD

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Komatsu WA70M-8E0 Wheel Loader Shop Manual VENBM09000  – PDF DOWNLOAD

Language : English
Pages : 490
Downloadable : Yes
File Type : PDF

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TABLE OF CONTENTS:

Komatsu WA70M-8E0 Wheel Loader Shop Manual VENBM09000  – PDF DOWNLOAD

• Model:             Serial number:
  WA70M-8E0   H71051 and up

VENBM09000 WA70M-8E0 1
INDEX AND FOREWORD 3
ABBREVIATION LIST . 4
List of abbreviations used in the text 4
List of abbreviations used in the circuit diagrams 9
FOREWORD, SAFETY, BASIC INFORMATION . 10
HOW TO READ THE SHOP MANUAL . 10
Composition of the shop manual 10
Symbols . 12
Signal word . 12
Unit 12
SAFETY NOTICE FOR OPERATION . 13
Safety matters 13
General precautions . 14
Precautions for preparatory work 15
Precautions during work . 15
Precautions for slinging work and making signals 17
Precautions for using mobile crane 20
Precautions for using overhead traveling crane 20
Selecting wire ropes 21
PRECAUTIONS TO PREVENT FIRE . 23
Fire caused by fuel, oil, coolant or window washer fluid 23
Fire caused by accumulation or attachment of flammable material . 23
Fire coming from electric wiring 23
Fire caused by piping . 24
Fire around the machine due to highly heated exhaust gas 24
Explosion caused by lighting equipment 24
ACTIONS IF FIRE OCCURS 25
PRECAUTIONS FOR DISPOSING OF WASTE MATERIALS 26
ACTIONS TAKEN TO MEET EXHAUST GAS REGULATIONS . 27
PRECAUTIONS FOR HANDLING HYDRAULIC EQUIPMENT 28
Select an appropriate workplace . 28
Disassembly and maintenance work in the field . 28
Sealing of openings (prevention of flowing out of oil) 28
Preventing intrusion of foreign materials during refilling 29
Replacing hydraulic oil while its temperature is high . 29
Avoid reusing the hydraulic oil and lubricating oil . 29
Flushing operation 29
Cleaning operation 30
PRECAUTIONS FOR DISCONNECTION AND CONNECTION OF PIPINGS . 31
PRECAUTIONS FOR HANDLING ELECTRICAL EQUIPMENT . 42
Defective contact of connectors (defective contact between male and female connectors) 42
Defective crimping or soldering of connectors . 43
Disconnection in wiring . 43
Water entering the connector by high-pressure jetting . 43
Entry of water, dirt, or dust when disconnecting a connector 43
Oil, mud, or dust stuck to connector 44
Select an appropriate workplace . 45
Sealing the opening . 45
How to clean parts when dirt is stuck . 45
Precautions for replacing fuel filter cartridge . 45
Select an appropriate workplace . 46
Sealing the opening . 46
PRACTICAL USE OF KOMTRAX 47
Merit of using KOMTRAX 47
How to make a full use of KOMTRAX . 48
How to operate KOMTRAX 48
Disconnecting connectors 49
Connecting connectors . 50
Drying wiring harness . 52
Handling controller . 53
Method for disconnecting Deutsch connector 54
Method for connecting Deutsch connector . 54
Method for disconnecting slide lock type connector (FRAMATOME-3, FRAMATOME-2) . 55
Method for connecting slide lock type connector (FRAMATOME-3, FRAMATOME-2) 55
Method for disconnecting slide lock type connector (FRAMATOME-24) . 55
Method for connecting slide lock type connector (FRAMATOME-24) 56
Method for disconnecting connector with lock to pull 57
Method for connecting connector with lock to pull . 57
Method for disconnecting connector with lock to push (BOSCH-3) 58
Method for connecting connector with lock to push (BOSCH-3) . 58
Method for disconnecting connector with lock to push (AMP-3) 59
Method for connecting connector with lock to push (AMP-3) . 59
Method for disconnecting connector with lock to push (SUMITOMO-3) . 59
Method for connecting connector with lock to push (SUMITOMO-3) 59
Method for disconnecting connector with lock to push (SUMITOMO-4) . 59
Method for connecting connector with lock to push (SUMITOMO-4) 59
Method for disconnecting connector with housing to rotate . 60
Method for connecting connector with housing to rotate 60
Method for connecting ring terminals and strip fuses to power stud of printed circuit boards 61
HOW TO READ ELECTRICAL WIRE CODE 62
TYPE, SYMBOL, AND MATERIAL 62
COLOR CODES TABLE . 63
EXPLANATION OF TERMS FOR MAINTENANCE STANDARD . 64
STANDARD DIMENSION AND TOLERANCE 64
STANDARD CLEARANCE AND STANDARD VALUE . 65
STANDARD INTERFERENCE . 65
REPAIR LIMIT AND ALLOWABLE VALUE OR ALLOWABLE DIMENSION . 65
ALLOWABLE CLEARANCE . 66
ALLOWABLE INTERFERENCE 66
STANDARD TIGHTENING TORQUE TABLE 67
CONVERSION TABLE 75
METHOD OF USING THE CONVERSION TABLE 75
EXAMPLES OF USING THE CONVERSION TABLE TO CONVERT A UNIT FROM MM TO IN 75
TEMPERATURE . 79
SPECIFICATIONS 83
DIMENSIONS, WEIGHTS AND OPERATING DATA 84
SPECIFICATIONS 86
WEIGHT TABLES . 87
LUBRICANTS AND OPERATING MEDIUMS 88
BASIC PROCEDURES OF MAINTENANCE . 90
OIL . 90
FUEL 90
COOLANT . 91
GREASE 91
STORING OIL AND FUEL 91
FILTERS . 92
OUTLINE OF ELECTRIC SYSTEM 92
TIGHTENING TORQUE LIST – METRIC SCREWS AND NUTS . 93
STRUCTURE AND FUNCTION 95
ABBREVIATION LIST . 99
List of abbreviations used in the text 99
List of abbreviations used in the circuit diagrams 104
ELECTRICAL SYSTEM .105
BOOT-UP SYSTEM 106
LAYOUT DRAWING OF BOOT-UP SYSTEM 106
AROUND THE CAB AND FLOOR 107
BATTERY DISCONNECT SWITCH .108
FUNCTION OF BATTERY DISCONNECT SWITCH .108
PREHEATING SYSTEM .110
FUNCTION OF AUTOMATIC PREHEATING SYSTEM .111
OPERATION OF AUTOMATIC PREHEATING SYSTEM 111
ENGINE SYSTEM .112
LAYOUT DRAWING OF ENGINE SYSTEM .112
COOLING SYSTEM 113
LAYOUT DRAWING OF COOLING SYSTEM 113
SPECIFICATIONS OF COOLING SYSTEM 114
COOLING FAN CONTROL SYSTEM 115
FUNCTION OF COOLING FAN CONTROL SYSTEM 116
COOLING FAN REVERSE ROTATION FUNCTION (Option) 116
COMPONENT PARTS OF COOLING SYSTEM .117
STRUCTURE OF COOLING FAN MOTOR 117
CONTROL SYSTEM 118
AROUND THE CAB AND FLOOR 119
MACHINE MONITOR SYSTEM 120
MACHINE MONITOR SYSTEM DIAGRAM 120
KOMTRAX SYSTEM 121
KOMTRAX SYSTEM DIAGRAM 121
FUNCTION OF KOMTRAX SYSTEM 121
COMPONENT PARTS OF CONTROL SYSTEM .122
MACHINE MONITOR .122
Function of KOMTRAX terminal 132
HST CONTROLLER 134
Structure of HST controller .134
Real time monitoring function .134
Self-diagnosis function .134
CAN TERMINATING RESISTOR 135
Function of CAN terminating resistor 135
ENGINE CONTROLLER .136
Real time monitoring function .136
Self-diagnosis function .136
ACCELERATOR PEDAL .137
Acceleration signal .137
Idling validation signal 137
Output Characteristics 138
HYDRAULIC SYSTEM 139
Structure of hydraulic tank .140
Specifications of hydraulic tank 140
Structure of main control valve .142
POWER TRAIN SYSTEM 144
OPERATION OF POWER TRAIN SYSTEM .145
FUNCTION OF THE CLOSED CIRCUIT SYSTEM .147
SPECIFICATIONS OF THE HST SYSTEM 147
STRUCTURE OF THE HST SYSTEM .148
20km/h without SpeedControl .148
COMPONENT PARTS OF POWER TRAIN SYSTEM .149
Structure of drive shaft 149
Function of drive shaft .149
Structure of HST pump .150
Operation of HST pump .151
Components of HST pump 152
HST motor .155
Structure of transfer box .156
Function of transfer box 157
Structure of front axle .158
Structure of rear axle 159
Function of differential 159
Function of towing system .161
WORK EQUIPMENT SYSTEM .162
Layout of work equipment system .162
WORK EQUIPMENT LOCK SYSTEM 164
ECSS (Option) .165
Function of ECSS 165
Operation of ECSS .165
RETURN TO DIG (option) 166
Structure .166
Function 166
Main control valve 167
Emergency lowering 167
Loader Linkage with quick-coupler .169
STEERING SYSTEM .171
STEERING COLUMN .172
Structure of steering column 172
General view 172
PRIORITY VALVE 175
ORBITROL-VALVE 176
STEERING RELIEF VALVE .177
LAYOUT DRAWING OF .178
SERVICE BRAKE ASSEMBLY 179
Inching Function 179
PARKING BRAKE ASSEMBLY 180
STRUCTURE OF 180
UNDERCARRIAGE AND FRAME .181
Rear axle mount .182
Frame, axle mount and center hinge pin 183
TIRE 184
Structure of radial tire 184
General view 184
Structure .184
Structure of bias tire 185
General view 185
Structure .185
WORK EQUIPMENT 186
STRUCTURE OF WORK EQUIPMENT .186
STRUCTURE OF BUCKET .187
General view and sectional view .187
CAB AND ITS ATTACHMENTS .188
ROPS FOPS CAB .188
Structure of ROPS FOPS cab 188
Function of ROPS FOPS cab .189
CAB MOUNT .190
Structure of cab mount 190
General view 190
Function of cab mount .190
STANDARD VALUE TABLE 201
ABBREVIATION LIST .202
List of abbreviations used in the text 202
List of abbreviations used in the circuit diagrams 207
STANDARD VALUE TABLE 208
Standard value table for engine .208
Standard value table for chassis 209
TEST CERTIFICATE 211
TESTING AND ADJUSTING .213
ABBREVIATION LIST .217
List of abbreviations used in the text 217
List of abbreviations used in the circuit diagrams 223
TEST ENGINE WITH SOFTWARE TOOL 224
CONNECTION OF A COMPUTER TO THE MACHINE .224
ENGINE AND COOLING SYSTEM .226
TEST ENGINE SPEED .226
Method for testing engine speed .226
Method for testing engine low idle speed 226
Method for testing engine high idle speed .227
Method for testing engine speed HST stall .228
Method for testing engine speed at hydraulic stall 229
Method for testing engine speed at full stall (HST stall and hydraulic stall) .230
TEST EXHAUST GAS COLOUR .232
Testing tool for exhaust gas colour .232
TEST AND ADJUST VALVE CLEARANCE .234
METHOD FOR TESTING AND ADJUSTINGVALVE CLEARANCE .235
TEST COMPRESSION PRESSURE .236
METHOD FOR TESTING COMPRESSION PRESSURE .236
Compression pressure inspection procedures 237
Injector reassembly procedures 238
TEST ENGINE OIL PRESSURE 239
METHOD FOR TESTING ENGINE OIL PRESSURE 239
METHOD FOR BLEEDING AIR FROM FUEL SYSTEM 240
TEST FUEL CIRCUIT FOR LEAKAGE .241
METHOD FOR TESTING FUEL CIRCUIT FOR LEAKAGE .241
Testing method of fuel circuit for leakage at engine stopped 241
Testing method of fuel circuit for leakage at engine low idle .242
Testing method of fuel circuit for leakage at engine high idle 242
HANDLE NO-INJECTION CRANKING OPERATION 243
TEST DOC AND MUFFLER STACK FOR LOOSENESS AND DAMAGE .244
METHOD FOR TESTING DOC AND MUFFLER STACK FOR LOOSENESS AND DAMAGE .244
TEST INSTALLED CONDITION OF CYLINDER HEADS AND MANIFOLDS 245
METHOD FOR TESTING INSTALLED CONDITION OF CYLINDER HEADS AND MANIFOLDS 245
TEST ENGINE PIPING FOR DAMAGE AND LOOSENESS .246
METHOD FOR TESTING ENGINE PIPING FOR DAMAGE AND LOOSENESS .246
TEST AND ADJUST AIR CONDITIONER COMPRESSOR BELT TENSION .247
METHOD FOR CHECKING AIR CONDITIONER COMPRESSOR BELT .247
METHOD FOR ADJUSTING AIR CONDITIONER COMPRESSOR BELT 248
TEST ALTERNATOR BELT 249
METHOD FOR TESTING ALTERNATOR BELT 249
POWER TRAIN .250
TEST AND ADJUST HST PRESSURE CUT OFF 250
TEST DRIVE SHAFT FOR LOOSENESS, BACKLASH, AND DAMAGE 251
METHOD FOR TESTING DRIVE SHAFT FOR LOOSENESS, BACKLASH, AND DAMAGE 251
STEERING SYSTEM .252
Operating time for steering wheel .252
Operating force of steering wheel .253
TEST AND ADJUST STEERING CIRCUIT OIL PRESSURE .254
METHOD FOR TESTING STEERING CIRCUIT OIL PRESSURE 255
METHOD FOR ADJUSTING STEERING CIRCUIT OIL PRESSURE 256
BLEED AIR FROM STEERING CYLINDER CIRCUIT 257
METHOD FOR BLEEDING AIR FROM STEERING CYLINDER CIRCUIT 257
BLEED AIR FROM BRAKE CIRCUIT 258
TEST BRAKING PERFORMANCE 260
MEASURING THE STOPPING DISTANCE .260
TEST AND ADJUST BRAKE PEDAL .261
TEST WEAR OF WHEEL BRAKE PADS .262
TEST PARKING BRAKE PERFORMANCE 263
HYDRAULIC SYSTEM 264
Release the remaining pressure from small accumulator for safety valves (option) 264
Releasing the remaining pressure in ECSS 266
TEST AND ADJUST WORK EQUIPMENT PRESSURE .267
TEST BOOST PRESSURE .268
TESTING AND ADJUSTING COOLING FAN SPEED .269
TEST ECSS ACCUMULATOR NITROGEN GAS PRESSURE .271
METHOD FOR TESTING THE ECSS ACCUMULATOR NITROGEN GAS PRESSURE .272
METHOD FOR CHARGING THE ECSS ACCUMULATOR WITH NITROGEN GAS 273
ELECTRICAL SYSTEM .275
SET AND ADJUST EACH EQUIPMENT .275
SET AND OPERATE MACHINE MONITOR .276
Switch panel 276
Operator mode and service mode of machine monitor .277
OPERATOR MODE .279
Setting usage limitation (password) .279
Change password .280
SERVICE MODE 282
METHOD FOR OPERATING SERVICE MODE .282
Table of self-define monitoring .285
ABNORMALITY RECORD MENU .294
Method for cleaning abnormality record 297
DEFAULT MENU 307
METHOD FOR SETTING WITH DEFAULT SETTING MENU (OPTION SELECTION) .309
ADJUSTMENT MENU .313
METHOD FOR ADJUSTING WITH ADJUSTMENT MENU (T/C DEVICE CALIBRATION) 313
HANDLE BATTERY DISCONNECT SWITCH 316
TEST DIODES .318
TROUBLESHOOTING .321
ABBREVIATION LIST .325
List of abbreviations used in the text 325
List of abbreviations used in the circuit diagrams 331
RELATED INFORMATION ON TROUBLESHOOTING 332
GENERAL TROUBLESHOOTING POINTS 332
SEQUENCE OF EVENTS IN TROUBLESHOOTING .334
CHECKS BEFORE TROUBLESHOOTING .336
Engine, lubricating oil and coolant .336
Hydraulic and mechanical equipment 336
Electric equipment 337
Exterior 337
Interior 337
INSPECTION PROCEDURE BEFORE TROUBLESHOOTING .338
WALK-AROUND CHECK .338
PROCEDURE FOR TESTING AND TROUBLESHOOTING .340
INFORMATION DESCRIBED IN TROUBLESHOOTING TABLE 341
CONNECTOR LOCATION LIST .343
CONNECTOR CONTACT IDENTIFICATION 351
SPARE FUSES AND RELAY .388
USB socket on central electric board (CEB) 393
FAILURE CODES TABLE .396
TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL SYSTEMS (H MODE) .431
TROUBLESHOOTING OF ENGINE (S-MODE) 440
S-4 ENGINE STARTABILITY IS POOR .444
S-9 EXHAUST SMOKE IS BLACK 452
S-12 FUEL CONSUMPTION IS EXCESSIVE 456
S-14 OIL PRESSURE DROPS .458
S-18 UNUSUAL NOISE IS HEARD .462
S-19 VIBRATION IS EXCESSIVE .463
DISASSEMBLY AND ASSEMBLY 465
ABBREVIATION LIST .467
List of abbreviations used in the text 467
RELATED INFORMATION ON DISASSEMBLY AND ASSEMBLY .472
HOW TO READ THIS MANUAL .472
Reading the work procedures .472
Reading the symbols .472
Reading the signal word .473
Reading the unit 473
COATING MATERIALS LIST 474
Adhesive 474
Liquid gasket .475
Molybdenum disulfide lubricant 475
Seizure prevention compound .476
Grease 476
Primer 477
Adhesive 477
Caulking material .477
ENGINE AND COOLING SYSTEM .478
REMOVE AND INSTALL SUPPLY PUMP ASSEMBLY .478
Removal of supply pump assembly .478
Reassembly of supply pump .480
REMOVE AND INSTALL INJECTOR ASSEMBLY 482
Removal of injector .482
Reassembly of injector 483
REMOVE AND INSTALL CYLINDER HEAD ASSEMBLY .485
Remove cylinder head assembly .486
Install the cylinder head .489
REMOVE AND INSTALL EGR VALVE ASSEMBLY .495
Remove the EGR cooler assembly 495
Remove the EGR valve 496
REMOVE AND INSTALL STARTING MOTOR ASSEMBLY 497
Removal of Starter Motor 497
Disassembly of Starter Motor 497
Reassembly of Starter Motor .500
Install the Starter Motor .501
REMOVE AND INSTALL AIR CONDITIONER COMPRESSOR BELT 502
METHOD FOR REMOVING AIR CONDITIONER COMPRESSOR BELT .502
METHOD FOR INSTALLING AIR CONDITIONER COMPRESSOR BELT .503
REMOVE AND INSTALL ALTERNATOR BELT 504
REMOVE AND INSTALL ALTERNATOR ASSEMBLY 506
Remove the alternator assembly 506
Disassemble the alternator assembly .507
Reassemble the alternator assembly 508
Install alternator assembly .508
REMOVE AND INSTALL COOLING FAN AND FAN MOTOR ASSEMBLY .509
Removal of fan assembly .509
Installation of fan assembly 510
REMOVE AND INSTALL RADIATOR AND HYDRAULIC TANK ASSEMBLY .510
Removal of radiator and hydraulic tank assembly .510
Installation of radiator and hydraulic tank assembly 513
REMOVE AND INSTALL ENGINE ASSEMBLY 514
Remove engine assembly 514
INSTALLATION OF ENGINE ASSEMBLY .518
REMOVE AND INSTALL ENGINE FRONT OIL SEAL 519
REMOVE AND INSTALL ENGINE HOOD ASSEMBLY .520
Removal of engine hood assembly consisting of plastic and steel hood 520
Removal of steel hood .520
Installation of steel hood 521
Removal of engine hood assembly .521
Installation of engine hood assembly 522
REMOVE AND INSTALL AFTERTREATMENT DEVICE 523
METHOD FOR REMOVING AFTER TREATMENT DEVICE ASSEMBLY .524
REMOVE AND INSTALL FUEL TANK ASSEMBLY .526
Remove the fuel tank 526
Installation of fuel tank .527
Fuelling fuel tank 527
REMOVE AND INSTALL AIR CLEANER ASSEMBLY .528
Removal of air cleaner assembly .528
Installation of air cleaner assembly 529
REMOVE AND INSTALL AIR CONDITIONER COMPRESSOR ASSEMBLY 529
Removal of air conditioner compressor assembly 530
Installation of air compressor assembly .530
REMOVE AND INSTALL AIR CONDITIONER CONDENSER ASSEMBLY .531
Remove air conditioner condenser assembly .532
Installation of air conditioner condenser assembly 533
POWER TRAIN .535
PUMP FOR STEERING, WORK EQUIPMENT, COOLING FAN 535
Removal of the pump for steering, work equipment and cooling fan 535
Installation of hydraulic pump assembly .535
ARTICULATED JOINT ASSEMBLY 536
Removal of articulation joint assembly 536
Installation of articulation joint assembly .536
HST MOTOR ASSEMBLY 537
Removal of HST motor assembly .537
Installation of variable motor assembly .538
HST PUMP ASSEMBLY .539
Removal of HST pump assembly 539
Installation of variable motor assembly .539
GEARBOX (TRANSFER ASSEMBLY) .541
PRECAUTIONS FOR ASSEMBLY AND DISASSEMBLY 541
SPECIFICATIONS 541
Conversion tables .542
TORQUE SPECIFICATIONS .543
Wheel nut tightening torques 544
Maintenance .545
MANDATORY PROCEDURE .546
End-stop plier setting 547
Input seal greasing .548
Maintenance intervals .549
Lubricant & Sealant specifications 550
SAFETY PRECAUTIONS 551
FLANGED REDUCTION GEAR 315 TYPE: INTEGRAL 315 INPUT GEAR 553
Exploded view .553
Disassembly .554
Assembly 557
PLANETARY REDUCTION GEAR 1: 4;23 560
Exploded view .560
Disassembly .561
Assembly 565
Special tools .570
BEVEL PINION FLANGED TO REDUCTOR 572
Exploded view .572
Disassembly .573
Assembly 576
Special tools .580
RING AND PINION ADJUSTING: STEP FOR PRELOADED DIFFERENTIAL 583
Exploded view .583
Install and Adjust 584
INTEGRATED GEAR BOX .587
Disassembly .588
Assembly 592
Special Tool 596
REAR AXLE ASSEMBLY 597
Removal of rear axle assembly .597
Installation of rear axle assembly 599
PRECAUTIONS FOR ASSEMBLY AND DISASSEMBLY OF AXLE COMPONENTS .600
SAFETY PRECAUTIONS 600
PLANETARY REDUCTION AND AXLE SHAFT 601
Exploded view .601
Disassembly .602
Assembly 606
Special Tools .610
RING AND PINION ADJUSTING: STEP FOR PRELOADED DIFFERENTIAL 612
Exploded view .612
Install and adjust 613
DIFFERENTIAL WITH BLOCK TO SPHERES 100% .616
Exploded view .616
Disassembly .617
Assembly 620
DIFFERENTIAL UNIT 45% .623
Exploded view .623
Disassembly .624
Assembly 626
FRONT AXLE ASSEMBLY .629
Removal of front axle assembly 629
Installation of front axle assembly .630
PRECAUTIONS FOR ASSEMBLY AND DISASSEMBLY OF AXLE COMPONENTS .631
Safety precautions 631
Lubricant & Sealant specifications 631
BRAKE: SERVICE BRAKE, NEGATIVE BRAKE, 100% LOCKED .633
SAFETY PRECAUTIONS 633
Exploded view .634
Brake working conditions 635
EMERGENCY RELEASE INSTRUCTIONS 639
Disassembly .640
Assembly 646
Brake piston gap check 655
Special tools .656
DISASSEMBLY AND ASSEMBLY OF NORMAL PRELOADED DIFFERENTIAL UNIT 657
SAFETY PRECAUTIONS 657
Exploded view .658
Disassembly .659
Assembly 662
PRELOADED LIMITED SLIP DIFFERENTIAL UNIT 45% 665
SAFETY PRECAUTIONS 665
Exploded view .666
Disassembly .667
Assembly 670
BEVEL PINION: NORMAL FLANGE AND NUT REVOLUTION COUNTER VERSION 673
SAFETY PRECAUTIONS 673
Exploded view .674
Disassembly .675
Assembly 678
Assembly: Revolution counter version 683
Special tools .685
BEVEL PINION 690
SAFETY PRECAUTIONS 690
Exploded view .691
Disassembly .692
Assembly 694
Special tools .698
RING AND PINION ADJUSTING: VERSION PINION COVER AND SINGLE ARM 702
SAFETY PRECAUTIONS 702
Exploded view .703
Assembly 704
Special tools .708
RING AND PINION ADJUSTING: VERSION PINION INTEGRAL AND DOUBLE ARM .709
SAFETY PRECAUTIONS 709
Exploded view .710
Assembly 711
UNDERCARRIAGE AND FRAME .714
REMOVAL AND INSTALLATION OF COUNTERWEIGHTASSEMBLY .714
Removal of counterweight assembly .714
Installation of counterweight assembly 714
HYDRAULIC SYSTEM 715
REMOVE AND INSTALL LIFT CYLINDER ASSEMBLY .715
Remove lift cylinder assembly .715
Removal of lift cylinder assembly .715
Install lift cylinder assembly 716
REMOVE AND INSTALL DUMP CYLINDER ASSEMBLY .716
Remove dumb cylinder assembly .716
Remove dump cylinder assembly .716
Installation of dump cylinder assembly 717
REMOVE AND INSTALL STEERING CYLINDER ASSEMBLY .717
Remove steering cylinder assembly .718
Remove steering cylinder assembly .718
Install steering cylinder assembly 718
WORK EQUIPMENT SYSTEM .719
REMOVE AND INSTALL MAIN VALVE ASSEMBLY 719
Removal of main control valve assembly 719
Installation of main control valve assembly .722
Removal of multifunction lever 723
REMOVE AND INSTALL QUICK COUPLER ASSEMBLY .724
Remove quick coupler assembly .724
Install quick coupler assembly 725
CAB AND ITS ATTACHMENTS .726
REMOVE AND INSTALL OPERATOR‘S CAB GLASS (ADHERED GLASS) .726
Preparation work for replacing the front window pane 727
Preparation work for replacing the rear window pane .727
Preparation work for replacing the door window pane .728
Left door assembly 728
Right door assembly .728
Remove operator’s cab glass (adhered glass) .728
Install operator’s cab glass (adhered glass) 730
REMOVE AND INSTALL AIR CONDITIONER UNIT ASSEMBLY 732
Remove air conditioner unit assembly 733
Install heater unit assembly 735
REMOVE AND INSTALL OPERATOR‘S SEAT ASSEMBLY .735
Remove operator‘s seat assembly (STD) .735
Install operator‘s seat assembly (STD) 736
Remove operator‘s seat assembly (air suspension, heatable) 736
Install operator‘s seat assembly (air suspension, heatable) .737
REMOVE AND INSTALL SEAT BELT 738
Remove seat belt on STD seat 738
Install seat belt on STD seat .739
Remove seat belt on suspension, heatable seat .739
Install seat belt on suspension, heatable seat 740
ELECTRICAL SYSTEM .741
REMOVE AND INSTALL ENGINE CONTROLLER ASSEMBLY .741
Method for removing engine controller assembly 742
REMOVE AND INSTALL HST CONTROLLER ASSEMBLY 744
Method for removing the cover of the console 744
REMOVE AND INSTALL MACHINE MONITOR ASSEMBLY .745
Method for removing machine monitor assembly 745
Method for installing machine monitor assembly 748
REMOVE AND INSTALL CENTRAL ELECTRIC BOARD (CEB) .749
Remove the cover of the console .749
Remove central electric board (CEB) .750
Remove I/O controller 64P .750
Remove differential lock relay 750
Install differential lock rely 750
Install I/O controller 64P 751
Install central electric boar (CEB) .751
Installation of the cover of the console 752
REMOVE AND INSTALL RELAYBOX .754
Remove relaybox .754
Remove battery relay 755
Remove the grommet frame from cables 755
Install the battery relay .756
Install the grommet frame to cables .756
Install relay box .757
MAINTENANCE STANDARD 759
ABBREVIATION LIST .761
List of abbreviations used in the text 761
List of abbreviations used in the circuit diagrams 766
ENGINE AND COOLING 767
MAINTENANCE STANDARD OF ENGINE MOUNT 767
MAINTENANCE STANDARD OF DAMPER 768
MAINTENANCE STANDARD OF COOLING FAN MOTOR .769
POWER TRAIN .770
MAINTENANCE STANDARD OF TRANSFER 770
MAINTENANCE STANDARD OF REAR AXLE .771
MAINTENANCE STANDARD OF FRONT AXLE 772
BRAKE SYSTEM 773
MAINTENANCE STANDARD OF PARKING BRAKE .773
HYDRAULIC SYSTEM 774
CAB AND ITS ATTACHMENTS .778
Cabin – adjustment 778
APPENDIX 779
ABBREVIATION LIST .781
List of abbreviations used in the text 781
List of abbreviations used in the circuit diagrams 786
AIR CONDITIONER SYSTEM 787
PRECAUTIONS FOR REFRIGERANT .787
AIR CONDITIONER COMPONENT .788
Specifications of air conditioner .788
CONFIGURATION AND FUNCTION OF REFRIGERATION CYCLE .789
OUTLINE OF REFRIGERATION CYCLE 790
Compression (Compressor) 790
Condensation (Condenser) 790
Expansion (Expansion valve) .790
Evaporation (Evaporator) 791
Relation between refrigerant and cooling trouble 791
AIR CONDITIONER TROUBLESHOOTING CHART .793
Cooling trouble .793
Heating trouble .793
CONNECTION OF SERVICE TOOL 794
METHOD FOR CONNECTING SERVICE TOOL 795
PRECAUTIONS FOR DISCONNECTING AND CONNECTING HOSES AND TUBES IN AIR CONDITIONER PIPINGS .796
Precautions for disconnection .796
Precautions for connection 797
HANDLE COMPRESSOR OIL .798
Management of compressor oil (SANDEN: SP-10 for use with R134a) .798
Filling of compressor oil .798
The quantity of compressor oil when the compressor is replaced 799
OTHER .801
HYDRAULIC CIRCUIT DIAGRAM .805
WIRING DIAGRAMS .807
Contents 807
1-0 SYMBOLS SUMMARY, ABBREVIATIONS 808
1-1 HARNESS ARRANGEMENT DETAILS, JOYSTICK BUTTONS .809
1-2 CAN BUS SUMMARY .810
2-0 POWER SUPPLY, STARTER SWITCH 811
2-1 GROUNDING .812
2-2 RELAYB., STARTER, ALTERN., BATTERY, GLOW PLUG .813
2-3 MAIN ENGINE (EGR) RELAY, EGR VALVE 814
3-0 ECU, DPF SENS., REGENER. SW., SEC. ENG. STOP 815
3-1 ECU, ENGINE SENSORS .816
3-2 INJECT., FUEL P., AIR CLEAN., TRAVEL PED., OIL PR .817
4-0 MONITOR, I/O CONTROLLER 64P, BUZZER .818
4-1 KOMTRAX CTRL, SERVICE CONNECTOR .819
4-2 FLUID-SENSORS (OIL, FUEL, COOLANT), SPEED SENS 820
5-0 IMMOBILIZER, PARKING BRAKE, FNR SWITCH 821
5-1 HST CONTROLLER, DRIVING FUNCTIONS .822
5-2 HST CONTROLLER INPUTS, AUTO INCH 823
5-3 CREEP .824
6-0 FAN DRIVE, REVERSE FAN 825
7-0 AIR CONDITIONER, OPERATOR’S SEAT 826
7-1 WASHER, WIPER, REAR WINDOW HEATER, HORN .827
8-0 LIGHTING FRONT 828
8-1 FLASHER .829
8-2 REAR LIGHT, BACKUP AL., REAR FLASHER 830
8-3 WORK LAMPS 831
8-4 INTERIOR LAMP, ROTATING BEACON, PLUG BOX 832
9-0 ECSS, OVER CENTER VALVE .833
9-1 RETURN TO DIG, QUICK COUPLER 834
9-2 RADIO, CLS, BLANK OPTION 835
W1 WIRING HARNESS LIST 836
W2 CONNECTOR LIST 1 .837
W2 CONNECTOR LIST 2 .838
W2 CONNECTOR LIST 3 .839
W2 CONNECTOR LIST 4 .840
W2 CONNECTOR LIST 5 .841
W3 PIN LOCATION LIST 1 842
W3 PIN LOCATION LIST 2 843
W3 PIN LOCATION LIST 3 844
W3 PIN LOCATION LIST 4 845
W3 PIN LOCATION LIST 5 846
WA PIN LOCATION LIST 6 847
W3 PIN LOCATION LIST 7 848
W3 PIN LOCATION LIST 8 849
W3 PIN LOCATION LIST 9 850
W3 PIN LOCATION LIST 10 .851
W3 PIN LOCATION LIST 11 .852
W3 PIN LOCATION LIST 12 .853
W3 PIN LOCATION LIST 13 .854
W3 PIN LOCATION LIST 14 .855
W3 PIN LOCATION LIST 15 .856
W3 PIN LOCATION LIST 16 .857
W3 PIN LOCATION LIST 17 .858
W3 PIN LOCATION LIST 18 .859
W3 PIN LOCATION LIST 19 .860
W3 PIN LOCATION LIST 20 .861
W3 PIN LOCATION LIST 21 .862
W3 PIN LOCATION LIST 22 .863
W3 PIN LOCATION LIST 23 .864
W3 PIN LOCATION LIST 24 .865
W3 PIN LOCATION LIST 25 .866
W3 PIN LOCATION LIST 26 .867
W4 PIN LOCATION LIST 1 868
W4 PIN LOCATION LIST 2 869
W4 PARTS LIST 3 .870
Connector diagram 1 .873
Connector diagram 2 .874
Connector diagram 3 .875
Connector table for the operator‘s cab wiring harness (Part 1/2) 875
Connector diagram 4 .876
Connector table for operator‘s cab wiring harness (Part 2/2) 876

DESCRIPTION:

Komatsu WA70M-8E0 Wheel Loader Shop Manual VENBM09000  – PDF DOWNLOAD

• Model:             Serial number:
  WA70M-8E0   H71051 and up

G.B 27/12/24