Komatsu WB140-2 WB150-2 Backhoe Loader Official
 Worksop Service Repair Manual #3 

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Complete & Official OEM Workshop Service Manual PDF Document
This Service repair manual offers detailed servicing instructions and will give you complete step by step information on repair, servicing, 
preventative maintenance & troubleshooting procedures for your Komatsu Equipment.
 This comprehensive service manual features photos and illustrations along with step-by-step instructions that will guide you through the entire repair process.
 This manual contains all you need to know to keep your Komatsu machine working correctly. 
You will find that this manual is a indispensable source of detailed maintenance and repair information and is the only service repair manual you will need for your Komatsu Equipment. 
It will help you better understand, care for, service, and overall will lower the repair and maintenance cost for your Komatsu .

* PDF FORMAT 
*Fully Bookmarked chapters for easy navigation allowing you to identify the exact service repair procedures in the quickest time possible. 
*Detailed illustrations, exploded diagrams, drawings and photos guide you through every service repair procedure. 

Models and Serial Numbers Covered :

WB140-2 -140F10001 and UP

WB140-2 - 30026 and UP

WB150-2 - 150F10001 and UP

CONTENTS :

10 STRUCTURE AND FUNCTION........................................................................................ 10-1

Power train ................................................................ 2

Transmission ............................................................. 4

Drive shafts................................................................ 9

Control valve block .................................................. 11

Front axle................................................................. 12

Rear axle ................................................................. 15

Hydraulic pump........................................................ 20

Steering unit ............................................................ 41

Hydraulic circuit (WB140-2)..................................... 43

Hydraulic circuit (WB150-2)..................................... 44

Shovel control valve ................................................ 46

Backhoe control valve ..............................................50

CLSS........................................................................57

Solenoid valve ..........................................................71

Safety valve..............................................................72

Brake pump..............................................................74

Shovel cylinder .........................................................75

Backhoe cylinder ......................................................76

Air-conditioning unit..................................................79

How the air-conditioning unit functions.....................80

Electrical diagram ....................................................81

Electrical diagram (Air conditiong)............................83

20 TESTING AND ADJUSTING ............................................................................................ 20-1

Normal or standard technical data............................. 2

Special tools ............................................................ 26

Measuring engine speed ......................................... 27

Adjusting valve clearance........................................ 28

Measuring compression pressure ........................... 29

Testing and adjusting fuel injection timing............... 30

Checking and tightening the fan - belt ..................... 32

Checking and tightening the compressor fan - belt . 33

Measuring accelerator pedal operating

travel and accelerator lever ..................................... 34

Adjusting brake pedal travel, brake alignment,

microswitches .......................................................... 36

Air bleeding - releasing residual pressure ............... 37

Checking and setting pressure in the attachments

hydraulic circuit ........................................................ 40

Testing and adjusting of load sensing signal

(LS valve) ................................................................ 46

Testing and adjusting of unloading valve .................47

Checking unloading valve functionality ....................48

Testing priority valve operation ................................49

Testing and setting steering control

system pressure .......................................................50

Testing brake system ...............................................51

Control of the engine speed under load ...................53

Testing pressures in the power train group ..............55

Testing the correct functioning of the power train

clutches ....................................................................57

Adjusting the sensor for return to dig device ............58

Analysis of causes hydraulic drift .............................59

Testing the air-conditioning unit ...............................64

Emptying the air-conditioning unit ............................66

Troubleshooting........................................................67

When

30 DISASSEMBLY AND ASSEMBLY.................................................................................. 30-1

HOW TO READ THE MANUAL................................. 3

PRECAUTIONS TO BE TAKEN WHILE WORKING. 4

SPECIAL TOOLS ...................................................... 5

STARTING MOTOR

Removal and installation ........................................... 9

ALTERNATOR

Removal .................................................................. 10

Installation ............................................................... 11

AIR-CONDITIONING UNIT COMPRESSOR

(Only for machines equipped with an air-conditioning unit)

Removal .................................................................. 12

Installation ............................................................... 13

INJECTION PUMP

Removal .................................................................. 14

Installation ............................................................... 17

INJECTION NOZZLES

Removal and installation ......................................... 18

THERMOSTAT

Removal and installation ......................................... 19

COOLING LIQUID PUMP

Removal .................................................................. 20

Installation ............................................................... 21

TURBOCOMPRESSOR

Removal .................................................................. 22

Installation ............................................................... 23

CYLINDER HEAD

Removal .................................................................. 24

Installation ............................................................... 26

ACCUMULATOR DISCONNECTING SWITCH

Removal and installation ......................................... 28

FRONT COUNTERWEIGHT

Removal and installation ......................................... 29

RADIATOR-OIL COOLER UNIT

Removal .................................................................. 30

Installation ............................................................... 32

CONDENSER

(Only for machines equipped with an air-conditioning unit)

Removal and installation ......................................... 33

HYDRAULIC OIL COOLER

Removal ...................................................................34

Installation ................................................................35

TRANSMISSION OIL COOLER

Removal and installation ..........................................36

MUFFLER

Removal and installation ..........................................37

EXHAUST PIPE

Removal and installation ..........................................38

ENGINE HOOD

Removal ...................................................................39

Installation ................................................................40

CAB

Removal ...................................................................41

Installation ................................................................44

HEAT AND AIR-CONDITIONING GROUP

Removal ...................................................................45

Installation ................................................................46

FUEL TANK

Removal and installation ..........................................47

HYDRAULIC OIL TANK

Removal and installation ..........................................48

ENGINE-GEARBOX-PUMP GROUP

Removal ...................................................................49

Installation ................................................................54

PISTON PUMP

Removal ...................................................................55

Installation ................................................................56

TRANSMISSION

Removal ...................................................................57

Installation ................................................................60

Disassembly and assembly......................................61

CONVERTOR

Removal and installation ..........................................61

TRANSMISSION-REVERSE, DIRECTION

INDICATOR AND HEADLIGHT DIPPER BEAM

CONTROL GROUP

Removal and installation ........................................139

STEERING UNIT

Removal and installation ........................................140

40 MAINTENANCE STANDARD........................................................................................... 40-1

Transmission ............................................................. 2

Front axle................................................................... 7

Rear axle ................................................................. 10

Hydraulic pump........................................................ 14

2-Spool control valve ............................................... 16

3-Spool control valve ............................................... 18

6-Spool control valve ............................................... 20

7-Spool control valve ............................................... 23

8-Spool control valve................................................25

Brake pump..............................................................26

Shovel cylinders .......................................................27

Backhoe cylinders ....................................................28

Front working equipment..........................................32

Swing bracket...........................................................34

Backhoe working equipment ....................................36

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File Format: PDF 
Pages: 486
Printable: Yes 
Language: English 
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