Komatsu WA500-6 User manual

WHEEL LOADER
SEN00236-05
WA500
-6
SERIAL NUMBERS
55001
and up

WA500-6 1
SEN00701-05
WHEEL LOADER
1SHOP MANUAL
WA500-6
Machine model Serial number
WA500-6 55001 and up
00 Index and foreword 1
Index
Composition of shop manual................................................................................................................ 2
Table of contents .................................................................................................................................. 4

SEN00701-05 00 Index and foreword
2WA500-6
Composition of shop manual 1
The contents of this shop manual are shown together with Form No. in a list.
Note 1: Always keep the latest version of this manual in accordance with this list and utilize accordingly.
The marks shown to the right of Form No. denote the following:
Q: New issue (to be filed additionally) q: Revision (to be replaced for each Form No.)
Note 2: This shop manual can be supplied for each Form No.
Note 3: To file this shop manual in the special binder for management, handle it as follows:
• Place a divider on the top of each section in the file after matching the Tub No. with No. indicated
next to each Section Name shown in the table below:
• File overview and other materials in sections in the order shown below and utilize them accord-
ingly.
Section Title Form Number
Shop Manual, contents binder, binder label and tabs SEN00236-05
00 Index and foreword SEN00575-05
Index SEN00701-05 q
Foreword and general information SEN00702-02 q
01 Specification SEN00576-01
Specification and technical data SEN00703-01 q
10 Structure, function and maintenance standard SEN00577-01
Engine and cooling system SEN00704-00
Power train, Part 1 SEN00705-01 q
Power train, Part 2 SEN00864-01 q
Steering system SEN00706-01 q
Brake system SEN00707-01 q
Undercarriage and frame SEN00708-01 q
Hydraulic system, Part 1 SEN00709-01 q
Hydraulic system, Part 2 SEN00875-01 q
Work equipment SEN00710-01 q
Cab and its attachments SEN00711-01 q
Electrical system, Part 1 SEN00712-01 q
Electrical system, Part 2 SEN00713-01 q
Electrical system, Part 3 SEN00874-01 q
20 Standard value table SEN00578-02
Standard service value table SEN00724-02
30 Testing and adjusting SEN00579-02
Testing and adjusting, Part 1 SEN00725-02
Testing and adjusting, Part 2 SEN00726-02
Testing and adjusting, Part 3 SEN00727-01
Testing and adjusting, Part 4 SEN00728-01
40 Troubleshooting SEN00580-01
General information on troubleshooting SEN00729-00
Troubleshooting by failure code (Display of code), Part 1 SEN00730-01

00 Index and foreword SEN00701-05
WA500-6 3
Troubleshooting by failure code (Display of code), Part 2 SEN00731-01
Troubleshooting by failure code (Display of code), Part 3 SEN00732-01
Troubleshooting by failure code (Display of code), Part 4 SEN00733-01
Troubleshooting by failure code (Display of code), Part 5 SEN00734-01
Troubleshooting by failure code (Display of code), Part 6 SEN00735-01
Troubleshooting by failure code (Display of code), Part 7 SEN00736-01
Troubleshooting by failure code (Display of code), Part 8 SEN00737-01
Troubleshooting by failure code (Display of code), Part 9 SEN00738-01
Troubleshooting by failure code (Display of code), Part 10 SEN00739-01
Troubleshooting of electrical system (E-mode) SEN00740-01
Troubleshooting of hydraulic and mechanical system (H-mode) SEN00741-00
Troubleshooting of engine (S-mode) SEN00742-01
50 Disassembly and assembly SEN00581-00
General information on disassembly and assembly SEN02022-00
Engine and cooling system SEN02023-00
Engine (SAA6D140E-5) SEN02024-00
Power train, Part 1 SEN02025-00
Power train, Part 2 SEN02026-00
Power train, Part 3 SEN02027-00
Brake system SEN02028-00
Undercarriage and frame SEN02029-00
Hydraulic system SEN02030-00
Work equipment SEN02031-00
Cab and its attachments SEN02032-00
Electrical system SEN02033-00
90 Diagrams and drawings SEN00582-01
Hydraulic diagrams and drawings SEN00714-01 q
Electrical diagrams and drawings SEN00715-00

SEN00701-05 00 Index and foreword
4WA500-6
Table of contents 1
00 Index and foreword
Index SEN00701-05
Composition of shop manual ................................................................................................... 2
Table of contents...................................................................................................................... 4
Foreword and general information SEN00702-02
Safety notice ............................................................................................................................ 2
How to read the shop manual.................................................................................................. 7
Explanation of terms for maintenance standard ...................................................................... 9
Handling of electric equipment and hydraulic component ....................................................... 11
Handling of connectors newly used for engines ...................................................................... 20
How to read electric wire code................................................................................................. 23
Precautions when carrying out operation ................................................................................ 26
Method of disassembling and connecting push-pull type coupler ........................................... 29
Standard tightening torque table.............................................................................................. 32
Conversion table...................................................................................................................... 36
01 Specification
Specification and technical data SEN00703-01
Specification and technical data .................................................................................................. 2
Specification dimension drawing.............................................................................................. 2
Specifications........................................................................................................................... 3
Weight table............................................................................................................................. 6
Table of fuel, coolant and lubricants ........................................................................................ 8
10 Structure, function and maintenance standard
Engine and cooling system SEN00704-00
Engine and cooling system ......................................................................................................... 2
Cooling system ........................................................................................................................ 2
Engine mount and transmission mount ................................................................................... 5
Power train, Part 1 SEN00705-01
Power train, Part 1....................................................................................................................... 3
Power train............................................................................................................................... 3
Power train system diagram .................................................................................................... 4
Joint ......................................................................................................................................... 6
Drive shaft................................................................................................................................ 7
Power train piping diagram ......................................................................................................8
Torque converter...................................................................................................................... 10
Torque converter regulator valve ............................................................................................. 28
Transmission............................................................................................................................ 30
Transfer.................................................................................................................................... 50
Transmission control valve ......................................................................................................52
ECMV ...................................................................................................................................... 56
Main relief valve and torque converter relief valve .................................................................. 63
Lubrication relief valve ............................................................................................................. 65
Power train, Part 2 SEN00864-01
Power train, Part 2....................................................................................................................... 2
Torque converter oil cooler ...................................................................................................... 2
Torque converter oil filter ......................................................................................................... 3
Center support ......................................................................................................................... 6
Axle.......................................................................................................................................... 8
Differential................................................................................................................................ 10
Limited slip differential ............................................................................................................. 19
Final drive ................................................................................................................................ 24

00 Index and foreword SEN00701-05
WA500-6 5
Steering system SEN00706-01
Steering system........................................................................................................................... 2
Steering piping diagram........................................................................................................... 2
Steering column....................................................................................................................... 3
Steering control valve .............................................................................................................. 4
Steering valve .......................................................................................................................... 15
Stop valve ................................................................................................................................ 19
Joystick steering lever linkage (if equipped)............................................................................ 20
Steering cylinder ...................................................................................................................... 21
Emergency steering piping diagram (if equipped) ................................................................... 22
Diverter valve........................................................................................................................... 23
Brake system SEN00707-01
Brake system .............................................................................................................................. 2
Brake piping diagram............................................................................................................... 2
Brake valve.............................................................................................................................. 4
Slack adjuster .......................................................................................................................... 9
Accumulator charge valve ....................................................................................................... 12
PPC relief valve ....................................................................................................................... 16
Accumulator (for brake) ........................................................................................................... 18
Brake ....................................................................................................................................... 20
Parking brake control............................................................................................................... 23
Parking brake .......................................................................................................................... 24
Parking brake solenoid valve................................................................................................... 26
Emergency parking brake release valve ................................................................................. 28
Undercarriage and frame SEN00708-01
Undercarriage and frame ............................................................................................................ 2
Axle mount............................................................................................................................... 2
Center hinge pin ...................................................................................................................... 7
Hydraulic system, Part 1 SEN00709-01
Hydraulic system, Part 1 ............................................................................................................. 2
Hydraulic piping diagram ......................................................................................................... 2
Work equipment control lever linkage ..................................................................................... 4
Hydraulic tank.......................................................................................................................... 5
Cooling fan motor .................................................................................................................... 7
Cooling fan pump .................................................................................................................... 14
Steering pump ......................................................................................................................... 21
Work equipment hydraulic pump ............................................................................................. 32
Hydraulic system, Part 2 SEN00875-01
Hydraulic system, Part 2 ............................................................................................................. 2
Control valve............................................................................................................................ 2
CLSS ....................................................................................................................................... 16
Each function and operation of each valve.............................................................................. 21
Accumulator (for PPC circuit) .................................................................................................. 32
Work equipment electric lever ................................................................................................. 33
Work equipment SEN00710-01
Work equipment .......................................................................................................................... 2
Work equipment linkage ..........................................................................................................2
Bucket...................................................................................................................................... 6
Bucket positioner and boom kick-out....................................................................................... 8
Work equipment lubrication ..................................................................................................... 9
Cab and its attachments SEN00711-01
Cab and its attachments.............................................................................................................. 2
ROPS cab................................................................................................................................ 2
Air conditioner.......................................................................................................................... 4
Electrical system, Part 1 SEN00712-01
Electrical system, Part 1.............................................................................................................. 2

SEN00701-05 00 Index and foreword
6WA500-6
Machine monitor system..........................................................................................................2
Machine monitor ...................................................................................................................... 10
Electrical system, Part 2 SEN00713-01
Electrical system, Part 2.............................................................................................................. 2
Work equipment control system .............................................................................................. 2
Transmission controller system ............................................................................................... 36
Electrical system, Part 3 SEN00874-01
Electrical system, Part 3.............................................................................................................. 2
Electric transmission control .................................................................................................... 2
Engine starting circuit .............................................................................................................. 6
Engine stopping circuit............................................................................................................. 8
Preheating circuit ..................................................................................................................... 9
Parking brake circuit ................................................................................................................ 11
Backup and stop lamp circuits ................................................................................................. 16
Small lamp and head lamp circuits .......................................................................................... 18
Working lamp circuit ................................................................................................................ 19
Horn circuit............................................................................................................................... 20
Wiper and window washer circuits........................................................................................... 21
Sensor ..................................................................................................................................... 24
KOMTRAX terminal system (if equipped)................................................................................ 42
20 Standard value table
Standard service value table SEN00724-02
Standard service value table ....................................................................................................... 2
Standard service value table for engine................................................................................... 2
Standard service value table for chassis ................................................................................. 3
30 Testing and adjusting
Testing and adjusting, Part 1 SEN00725-02
Testing and adjusting, Part 1 ....................................................................................................... 3
Tools for testing, adjusting, and troubleshooting...................................................................... 3
Measuring engine speed ......................................................................................................... 6
Measuring exhaust gas color................................................................................................... 8
Measuring exhaust temperature .............................................................................................. 10
Adjusting valve clearance ........................................................................................................ 12
Testing compression pressure ................................................................................................. 13
Measuring blow-by pressure.................................................................................................... 15
Measuring engine oil pressure................................................................................................. 16
Measuring intake air (boost) pressure ..................................................................................... 17
Handling fuel system equipment.............................................................................................. 19
Releasing residual pressure in fuel system ............................................................................. 19
Testing fuel pressure................................................................................................................ 20
Testing return rate and leakage ............................................................................................... 21
Bleeding air from fuel circuit .................................................................................................... 24
Testing leakage in fuel system................................................................................................. 26
Handling reduced cylinder mode operation ............................................................................. 27
Handling no injection cranking operation................................................................................. 27
Handling controller voltage circuit............................................................................................ 28
Testing and adjusting alternator belt tension ........................................................................... 29
Testing and adjusting air conditioner compressor belt tension ................................................ 30
Adjusting transmission speed sensor ...................................................................................... 31
Measuring directional lever (Steering wheel specification) ...................................................... 33
Testing and adjusting power train oil pressure......................................................................... 34
Flushing procedure for torque converter and transmission hydraulic circuit............................ 47
Method of moving machine when transmission valve is broken.............................................. 50

00 Index and foreword SEN00701-05
WA500-6 7
Testing and adjusting, Part 2 SEN00726-02
Testing and adjusting, Part 2....................................................................................................... 3
Testing and adjusting steering stop valve................................................................................ 3
Testing and adjusting steering wheel....................................................................................... 5
Testing steering oil pressure.................................................................................................... 7
Bleeding air from steering cylinder circuit................................................................................ 10
Testing hydraulic drive fan ....................................................................................................... 11
Bleeding air from hydraulic drive fan circuit............................................................................. 14
Measuring brake pedal ............................................................................................................ 16
Measuring brake performance................................................................................................. 17
Testing and adjusting accumulator charge pressure ............................................................... 18
Testing wheel brake oil pressure ............................................................................................. 20
Measuring wear of wheel brake disc ....................................................................................... 22
Bleeding air from brake circuit .................................................................................................23
Releasing residual pressure in brake accumulator circuit ....................................................... 25
Testing parking brake performance ......................................................................................... 26
Measuring parking brake oil pressure ..................................................................................... 27
Testing wear of parking brake disc .......................................................................................... 30
Method of releasing parking brake manually ........................................................................... 31
Measuring and adjusting work equipment control lever .......................................................... 32
Testing and adjusting work equipment PPC oil pressure ........................................................ 33
Measuring work equipment oil pressure.................................................................................. 35
Bleeding air from work equipment circuit................................................................................. 41
Releasing residual pressure in work equipment circuit ........................................................... 42
Method of moving machine when removing operator cab (when splittable cab is used)......... 43
Testing and adjusting bucket positioner................................................................................... 44
Testing and adjusting lift arm position detecting lever ............................................................. 46
Checking proximity switch operation indication lamp .............................................................. 47
Procedure for testing diodes....................................................................................................48
Preparations for work on troubleshooting of electrical system ................................................ 49
Testing and adjusting, Part 3 SEN00727-01
Testing and adjusting, Part 3....................................................................................................... 2
Starting KOMTRAX terminal operations (if equipped) ............................................................. 2
Indicator lamps of KOMTRAX terminal (if equipped)............................................................... 8
Machine monitor-based adjustment at replacement, disassembly and assembly,
and additional installation for each sensor and controller ................................................ 11
Special functions of machine monitor (EMMS)........................................................................ 13
Testing and adjusting, Part 4 SEN00728-01
Testing and adjusting, Part 4....................................................................................................... 2
Special functions of machine monitor (EMMS)........................................................................ 2
Pm click inspection table ......................................................................................................... 40

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