Komatsu Backhoe-Loader WB70A-1 Shop Manual WEBM003200 – PDF DOWNLOAD

Komatsu Backhoe-Loader WB70A-1 Shop Manual WEBM003200 – PDF DOWNLOAD

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Komatsu Backhoe-Loader WB70A-1 Shop Manual WEBM003200 – PDF DOWNLOAD 

Language : English
Pages : 348
Downloadable : Yes
File Type : PDF
Size: 17.9 MB

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Komatsu Backhoe-Loader WB70A-1 Shop Manual WEBM003200 – PDF DOWNLOAD 

SERIAL NUMBERWB70A-1 F10392 and up

GENERAL PRECAUTIONS:

Mistakes in operation are extremely dangerous. Read the Operation and Maintenance Manual carefully BEFORE operating the machine.1 .Before carrying out any greasing or repairs, read all the precautions given on the decals which are fixed to the machine.
2.When carrying out any operation, always wear safety shoes and helmet. Do not wear loose work clothes, or clothes with buttons missing.

•  Always wear safety glasses when hitting parts with a hammer.
•  Always wear safety glasses when grinding parts with a grinder, etc.

3. If welding repairs are needed, always have a trained, experienced welder carry out the work. When carrying out welding work, always wear welding gloves, apron, glasses, cap and other clothes suited for welding work.4.When carrying out any operation with two or more workers, always agree on the op- erating procedure before starting. Always inform your fellow workers before starting any step of the operation. Before starting work, hang UNDER REPAIR signs on the controls in the operator’s compartment.5. Keep all tools in good condition and learn the correct way to use them.
6. Decide a place in the repair workshop to keep tools and removed parts. Always keep the tools and parts in their correct places. Always keep the work area clean and make sure that there is no dirt or oil on the floor. Smoke only in the areas provided for smoking. Never smoke while working.PREPARATIONS FOR WORK:
7. Before adding or making any repairs, park the machine on hard, level ground, and block the wheels to
prevent the machine from moving.
8. Before starting work, lower outrigger, bucket or any other work equipment to the ground. If this is not possible,
use blocks to prevent the work equipment from falling down. In addition, be sure to lock all the control levers and hang warning sign on them.
9. When disassembling or assembling, support the machine with blocks, jacks or stands before starting
work.
10. Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, ladders or steps when getting on or off the machine.Never jump on or off the machine. If it is impossible to use the handrails, ladders or steps, use a stand to provide safe footing.

TABLE OF CONTENTS:

Komatsu Backhoe-Loader WB70A-1 Shop Manual WEBM003200 – PDF DOWNLOAD 

COVER…………………………………………………………………………… 1
CONTENTS…………………………………………………………………….. 3
LIST OF REVISED PAGES…………………………………………………………. 5
SAFETY………………………………………………………………………. 7
FOREWORD…………………………………………………………………….. 9
HOW TO READ THE SHOP MANUAL……………………………………………………. 10
HOISTING INSTRUCTIONS…………………………………………………………. 11
STANDARD TIGHTENING TORQUE…………………………………………………….. 12
COATING MATERIALS…………………………………………………………….. 14
ELECTRIC WIRE CODE……………………………………………………………. 15
WEIGHT TABLE…………………………………………………………………. 16
TABLE OF OIL AND COOLANT QUANTITIES…………………………………………….. 17
10. STRUCTURE AND FUNCTION…………………………………………………….. 21
P.T.O……………………………………………………………………. 22
POWER TRAIN………………………………………………………………. 23
TRANSMISSION……………………………………………………………… 24
AXLES……………………………………………………………………. 26
HYDROSTATIC TRANSMISSION…………………………………………………… 32
HYDROSTATIC TRANSMISSION PUMP………………………………………………. 34
INCHING VALVE…………………………………………………………….. 42
TRAVEL MOTOR……………………………………………………………… 43
STEERING SYSTEM…………………………………………………………… 48
STEERING SYSTEM PUMP………………………………………………………. 49
STEERING UNIT…………………………………………………………….. 50
PRIORITY VALVE……………………………………………………………. 51
FRAMES KNUCKLE AND JOINT…………………………………………………… 52
HYDRAULIC CIRCUIT DIAGRAM………………………………………………….. 53
3-SPOOL CONTROL VALVE……………………………………………………… 55
6-SPOOL CONTROL VALVE……………………………………………………… 56
7- SPOOL CONTROL VALVE…………………………………………………….. 58
VALVES…………………………………………………………………… 60
GEAR PUMP………………………………………………………………… 62
OUTRIGGER SAFETY VALVES……………………………………………………. 63
BRAKE PUMP……………………………………………………………….. 64
FRONT EQUIPMENT CYLINDER…………………………………………………… 66
FRONT WORK EQUIPMENT………………………………………………………. 68
LOADER CONTROL LEVER………………………………………………………. 69
BACKHOE CYLINDER………………………………………………………….. 70
BACKHOE WORK EQUIPMENT…………………………………………………….. 74
BACKOHE CONTROL LEVER……………………………………………………… 75
SOLENOID VALVE……………………………………………………………. 76
ELECTRIC DIAGRAM………………………………………………………….. 77
20. TESTING AND ADJUSTMENTS……………………………………………………. 89
NORMAL OR STANDARD TECHNICAL DATA…………………………………………… 90
SPECIAL TOOLS……………………………………………………………..104
MEASURING ENGINE SPEED……………………………………………………..105
ADJUSTING VALVE CLEARANCE…………………………………………………..106
MEASURING COMPRESSION PRESSURE………………………………………………107
TESTING AND ADJUSTING FUEL INJECTION TIMING…………………………………..108
CHECKING AND TIGHTENING THE FAN – BELT……………………………………….109
MEASURING ACCELERATOR PEDAL OPERATING FORCE AND ACCELERATION LEVER………………110
ADJUSTING INCH PEDAL TRAVEL…………………………………………………111
ADJUSTING BRAKE PEDAL TRAVEL………………………………………………..112
TESTING FRAME ARTICULTATION CLEARANCE………………………………………..113
AIR BLEEDING – RELEASING RESIDUAL PRESSURE……………………………………114
CHECKING AND SETTING PRESSURE IN THE ATTACHMENTS HYDRAULIC CIRCUIT………………118
TESTING AND ADJUSTING HYDROSTATIC TRANSMISSION………………………………..122
TESTING AND ADJUSTING TRAVEL MAXIMUM SPEED (UNIERSAL JOINT)…………………….128
TESTING TRAVEL MOTOR LEAKEAGE……………………………………………….129
ADJUSTING TRANSMISSION SENSOR……………………………………………….130
TESTING PRIORITY VALVE OPERATION…………………………………………….131
TESTING AND SETTING STEERING CONTROL SYSTEM PRESSURE…………………………..132
TESTING STEERING CYLINDER LEAKAGE……………………………………………133
TESTING BRAKE SYSTEM……………………………………………………….134
ADJUSTING PARKING BRAKE LEVER……………………………………………….136
CHECKING WEAR IN THE BRAKE DISKS…………………………………………….137
ANALYSIS OF CAUSES HYDRAULIC DRIFTS………………………………………….138
ADJUSTING OF CYLINDER DRAFT OF BACKFRAME LOCKING………………………………143
30. DISASSEMBLY AND ASSEMBLY……………………………………………………147
HOW TO READ THE MANUAL……………………………………………………..149
PRECAUSIONS TO BE TAKEN WHILE WORKING………………………………………..150
SPECIAL TOOLS (For machine)…………………………………………………151
SPECIAL TOOLS (For backhoe)…………………………………………………153
STARTER MOTOR……………………………………………………………..155
ALTERNATOR………………………………………………………………..156
INJECTION PUMP…………………………………………………………….157
NOZZLE HOLDER……………………………………………………………..161
CYLINDER HEAD……………………………………………………………..162
RADIATOR – OIL COOLER UNIT………………………………………………….164
MUFFLER…………………………………………………………………..166
SEAT AND ENGINE HOOD……………………………………………………….167
SIDE COVER………………………………………………………………..168
HEATING RADIATOR…………………………………………………………..169
CAB………………………………………………………………………170
FUEL TANK…………………………………………………………………174
HYDRAULIC OIL TANK…………………………………………………………175
ENGINE – PUMP GROUP………………………………………………………..176
PISTON PUMP AND STEERING PUMP……………………………………………….180
PISTON PUMP……………………………………………………………….181
ENGINE-PUMP COUPLING JOINT………………………………………………….193
TRAVEL MOTOR………………………………………………………………194
STEERING PUMP……………………………………………………………..204
STEERING GEAR PUMP…………………………………………………………205
WORK EQUIPMENT PUMP………………………………………………………..209
BRAKE PUMP………………………………………………………………..210
TRANSMISSION-REVERSE, DIRECTION INDICATOR AND HEADLING DIPPER BEAM CONTROL GROUP….211
STEERING UNIT……………………………………………………………..212
PRIORITY VALVE…………………………………………………………….229
FRONT EQUIPMENT CONTROL VALVE……………………………………………….231
FRONT AXLE………………………………………………………………..232
REAR AXLE…………………………………………………………………234
AXLES…………………………………………………………………….236
TRANSMISSION………………………………………………………………252
FRAME JOINT PIN……………………………………………………………270
FRONT BUCKET LIFT ARM CYLINDERS……………………………………………..273
FRONT BUCKET DUMPING CYLINDER……………………………………………….274
STEERING CYLINDERS…………………………………………………………275
FRAME OSCILLATING LOCK CYLINDER……………………………………………..276
MACHINE CYLINDERS………………………………………………………….277
FRAME OSCILLATING LOCK CYLINDER……………………………………………..283
FRONT BUCKET………………………………………………………………284
TILT LEVER AND BUCKET LINK………………………………………………….285
FRONT BUCKET LIFT ARM………………………………………………………286
BACKHOE CONTROL VALVE………………………………………………………287
BACKHOE BOOM CYLINDER………………………………………………………290
BACKHOE ARM CYLINDER……………………………………………………….291
BACKHOE BUCKET CYLINDER…………………………………………………….292
BACKHOE SWING CYLINDERS…………………………………………………….293
HOUTRIGGER CYLINDERS……………………………………………………….294
BACKHOE BACKFRAME LOCK CYLINDERS…………………………………………….295
BACKHOE CYLINDERS (boom, arm, bucket, outrigger, jig arm)………………………296
BOOM SWING CYLINDER………………………………………………………..302
BACKHOE EQUIPMENT………………………………………………………….305
BACKHOE BUCKET…………………………………………………………….306
ARM………………………………………………………………………307
BACKHOE BOOM………………………………………………………………308
BRACKET…………………………………………………………………..309
BACKFRAME…………………………………………………………………310
40. MAINTENANCE STANDARD……………………………………………………….313
P.T.O…………………………………………………………………….315
TRANSMISSION………………………………………………………………316
AXLES…………………………………………………………………….318
HYDROSTATIC TRANSMISSION PUMP……………………………………………….323
TRAVEL MOTOR………………………………………………………………327
STEERING PUMP (P2)…………………………………………………………329
3-SPOOL CONTROL VALVE………………………………………………………330
BRAKE PUMP………………………………………………………………..332
OUTRIGGER SAFETY VALVES…………………………………………………….333
STEERING AND FRONT WORK EQUIPMENT CYLINDERS…………………………………..334
BACKHOE CYLINDERS………………………………………………………….336
FRAME KNUCKLE AND JOINT…………………………………………………….340
BACKHOE FRAME……………………………………………………………..341
FRONT WORK EQUIPMENT……………………………………………………….342
BACKFRAME AND BRACKET………………………………………………………344
BACKHOE WORK EQUIPMENT……………………………………………………..346