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Komatsu WA470-6LC, WA480-6LC Wheel Loader Service Manual

1,786 pages · Publication VEBM660100

$179.55
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Models
WA470-6LC, WA480-6LC
Serial coverage
WA470-6LC H50880 and up, WA480-6LC H60470 and up
Manual type
Service Manual
Pages
1,786
Publication
VEBM660100
Condition
Brand new
Komatsu WA470-6LC, WA480-6LC Wheel Loader Service Manual, publication VEBM660100

What's inside

From the manual's own table of contents: 297 sections, 567 entries. See sample pages (PDF, 1573 KB)

Composition of shop manual
Safety notice
How to read the shop manual
Explanation of terms for maintenance standard
Handling of electric equipment and hydraulic component
Handling of connectors newly used for engines
How to read electric wire code
Precautions when carrying out operation
Method of disassembling and connecting push-pull type coupler
Standard tightening torque table
Conversion table
Specification dimension drawing
Specifications
Weight table
Table of fuel, coolant and lubricants
Engine mount and transmission mount
Cooling system
Cooling fan pump
Cooling fan motor
Power train
Power train system diagram
Drive shaft
Power train piping diagram
Torque converter
Show all 297 sections
Transmission
Transmission control valve
ECMV
Main relief valve and torque converter relief valve
Axle
Differential
Limited slip differential
Final drive
Steering component layout drawing
Steering column
Steering pump
Steering valve
Orbit-roll valve
Stop valve
Steering relief valve
Steering cylinder
Emergency steering motor
Emergency steering pump
Joystick steering lever linkage47 topics
  • Electrical steering lever
  • Joystick EPC valve
  • Brake component layout drawing
  • Charge valve
  • Brake valve
  • Accumulator (for brake)
  • Slack adjuster
  • Brake
  • Parking brake control
  • Parking brake
  • Parking brake solenoid valve
  • Emergency parking brake release valve
  • Axle mount and center hinge pin
  • Tires
  • Hydraulic component layout drawing
  • Work equipment control lever linkage
  • Hydraulic tank
  • Power train pump
  • Work equipment pump
  • Work equipment control valve
  • CLSS
  • Each function and operation of each valve
  • PPC valve
  • Accumulator (for PPC circuit)
  • Accumulator (for power train circuit)
  • Accumulator (for ECSS)
  • Work equipment PPC cut-off solenoid valve
  • Work equipment linkage
  • Bucket
  • Bucket positioner and boom kick-out
  • Work equipment cylinder
  • Air conditioner
  • Machine monitor system
  • Machine monitor
  • Electrical system (Transmission controller system)
  • Transmission controller
  • Electrical system (Work equipment controller system)
  • Work equipment controller
  • Electric transmission control
  • Kickdown switch and hold switch
  • Load meter cancel switch and load meter subtotal switch
  • Multi-function knob
  • Joystick steering knob
  • KOMTRAX system
  • Engine starting circuit
  • Engine stopping circuit
  • Preheating circuit
Engine power mode selector circuit
Engine output derating function
Automatic warm-up function
Parking brake circuit
Sensor
Standard value table for engine
Standard value table for chassis
Tools for testing, adjusting, and troubleshooting
Testing engine speed
Testing exhaust gas color
Testing exhaust temperature
Adjusting valve clearance
Testing compression pressure
Testing blow-by pressure
Testing engine oil pressure
Testing EGR valve drive pressure
Testing intake air (boost) pressure
Handling fuel system equipment
Releasing residual pressure in fuel system
Testing fuel pressure
Testing fuel return and leak amount
Bleeding air from fuel circuit
Testing fuel circuit for leakage
Handling of reduced cylinder mode operation
Handling of no injection cranking operation
Handling of controller voltage circuit
Check of muffler and muffler stack for looseness and damage
Check of muffler function
Check of installed condition of cylinder head and manifolds
Check of engine piping for damage and looseness
Testing and adjusting air conditioner compressor belt tension
Testing and adjusting alternator belt tension
Adjusting transmission speed sensor
Adjusting directional lever length
Adjusting gear shift lever length
Testing FNR lever and gear shift lever
Testing and adjusting power train oil pressure
Procedure for flushing torque converter and transmission hydraulic circuit
Method of moving machine when transmission valve is broken
Check of axle final drive for oil leakage
Check of drive shafts for looseness, play and damage
Testing and adjusting steering stop valve
Testing and adjusting steering wheel
Testing steering oil pressure
Bleeding air from steering circuit
Testing hydraulic drive fan
Adjustment of hydraulic fan speed sensor
Bleeding air from hydraulic drive fan circuit
Testing brake pedal
Testing and adjusting brake pedal linkage50 topics
  • Testing brake performance
  • Testing and adjusting accumulator charge pressure
  • Testing wheel brake oil pressure
  • Testing wear of wheel brake disc
  • Bleeding air from wheel brake circuit
  • Releasing residual pressure in brake accumulator circuit
  • Testing parking brake performance
  • Testing parking brake oil pressure
  • Testing wear of parking brake disc
  • Manual release method for parking brake
  • Testing and adjusting work equipment control lever
  • Testing and adjusting work equipment PPC oil pressure
  • Testing and adjusting work equipment oil pressure
  • Bleeding air from work equipment circuit
  • Releasing residual pressure in work equipment circuit
  • Testing and adjusting bucket positioner
  • Testing and adjusting boom kick-out
  • Checking proximity switch operation pilot lamp
  • Procedure for testing diodes
  • Preparation work for troubleshooting for electrical system
  • How to start KOMTRAX terminal operations
  • Indicator lamps of KOMTRAX terminal
  • Adjusting replaced, reassembled or added sensor, controller, etc. with machine monitor
  • Special functions of machine monitor (EMMS)
  • Pm-clinic inspection table
  • Failure code table
  • Fuse locations
  • Points to remember when troubleshooting
  • Sequence of events in troubleshooting
  • Testing before troubleshooting
  • Classification and procedures of troubleshooting
  • Information contained in troubleshooting table
  • Connection table for connector pin numbers
  • T- branch box and T- branch adapter table
  • Failure code [1500L0] (TORQFLOW transmission: Double meshing)
  • Failure code [15SAL1] (ECMV F clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SALH] (ECMV F clutch: When command current is ON, fill signal is OFF)
  • Failure code [15SBL1] (ECMV R clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SBLH] (ECMV R clutch: When command current is ON, fill signal is OFF)
  • Failure code [15SEL1] (ECMV 1st clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SELH] (ECMV 1st clutch: When command current is ON, fill signal is OFF)
  • Failure code [15SFL1] (ECMV 2nd clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SFLH] (ECMV 2nd clutch: When command current is ON, fill signal is OFF)
  • Failure code [15SGL1] (ECMV 3rd clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SGLH] (ECMV 3rd clutch: When command current is ON, fill signal is OFF)
  • Failure code [15SHL1] (ECMV 4th clutch: When command current is OFF, fill signal is ON)
  • Failure code [15SHLH] (ECMV 4th clutch: When command current is ON, fill signal is OFF)
  • Failure code [2F00MA] (Parking brake: Malfunction)
  • Failure code [2G43ZG] (Accumulator: Low oil pressure)
  • Failure code [44K0L4] (Bucket positioner: ON/OFF signals disagree)
Failure code [AA1ANX] (Air cleaner: Clogging)
Failure code [AB00L6] (Alternator: Signal disagrees with operating state of engine)
Failure code [AB00MA] (Alternator: Malfunction)
Failure code [B@BAZG] (Rotation derating by low engine oil pressure)
Failure code [B@BAZK] (Engine oil: Low level)
Failure code [B@BCNS] (Coolant: Overheating)
Failure code [B@BCZK] (Coolant: Low level)
Failure code [B@C7NS] (Brake oil: Overheating)
Failure code [b@CENS] (Torque converter oil: Overheating)
Failure code [B@HANS] (Hydraulic oil: Overheating)
Failure code [CA111] (Abnormality in engine controller)
Failure code [CA115] (Engine Ne or Bkup speed sensor error)
Failure code [CA122] (Charge pressure sensor high error)
Failure code [CA123] (Charge pressure sensor low error)
Failure code [CA131] (Throttle sensor high error)
Failure code [CA132] (Throttle sensor low error)
Failure code [CA135] (Engine oil pressure sensor high error)
Failure code [CA141] (Engine oil pressure sensor low error)
Failure code [CA144] (Coolant sensor high error)
Failure code [CA145] (Coolant sensor low error)
Failure code [CA153] (Charge temperature sensor high error)
Failure code [CA154] (Charge temperature sensor low error)
Failure code [CA187] (Sensor power supply 2 low error)
Failure code [CA221] (Atmospheric pressure sensor high error)
Failure code [CA222] (Atmospheric pressure sensor low error)
Failure code [CA227] (Sensor power supply 2 high error)
Failure code [CA234] (Engine overspeed)
Failure code [CA238] (Ne speed sensor power supply error)
Failure code [CA263] (Fuel temperature sensor high error)
Failure code [CA265] (Fuel temperature sensor low error)
Failure code [CA271] (PCV1 Short circuit)
Failure code [CA272] (PCV1 Disconnection)
Failure code [CA273] (PCV2 Short circuit)
Failure code [CA274] (PCV2 Disconnection)
Failure code [CA322] (Injector #1 open/short error)
Failure code [CA323] (Injector #5 open/short error)
Failure code [CA324] (Injector #3 open/short error)
Failure code [CA325] (Injector #6 open/short error)
Failure code [CA331] (Injector #2 open/short error)
Failure code [CA332] (Injector #4 open/short error)
Failure code [CA342] (Calibration code inconsistency)
Failure code [CA351] (Injectors drive circuit error)
Failure code [CA352] (Sensor power supply 1 low error)
Failure code [CA386] (Sensor power supply 1 high error)
Failure code [CA431] (Idle validation switch error)
Failure code [CA432] (Idle validation action error)
Failure code [CA441] (Battery voltage low error)
Failure code [CA442] (Battery voltage high error)
Failure code [CA449] Common rail pressure high error 2
Failure code [CA451] (Common rail pressure sensor high error)
Failure code [CA452] (Common rail pressure sensor low error)
Failure code [CA553] (Common rail pressure high error 1)
Failure code [CA554] (Common rail pressure sensor in-range error)
Failure code [CA559] (Supply pump pressure very low error)
Failure code [CA689] (Engine Ne speed sensor error)44 topics
  • Failure code [CA731] (Engine Bkup speed sensor phase error)
  • Failure code [CA757] (All continuous data lost error)
  • Failure code [CA778] (Engine Bkup speed sensor error)
  • Failure code [CA1228] (EGR valve servo error 1)
  • Failure code [CA1625] (EGR valve servo error 2)
  • Failure code [CA1633] (KOMNET datalink timeout error)
  • Failure code [CA2185] (Throttle sensor supply voltage high error)
  • Failure code [CA2186] (Throttle sensor power supply low error)
  • Failure code [CA2249] (Supply pump pressure very low error 2)
  • Failure code [CA2271] (EGR valve lift sensor high error)
  • Failure code [CA2272] (EGR valve lift sensor low error)
  • Failure code [CA2351] (EGR valve solenoid operation short circuit)
  • Failure code [CA2352] (EGR valve solenoid operation disconnect)
  • Failure code [CA2555] (Intake heater relay disconnection error)
  • Failure code [CA2556] (Intake heater relay short circuit error)
  • Failure code [D150KA] (Emergency steering relay: Disconnection)
  • Failure code [D150KB] (Emergency steering relay: Short circuit)
  • Failure code [D150KY] (Emergency steering relay: Short circuit with power supply line)
  • Failure code [D160KA] (Backup lamp relay output: Disconnection)
  • Failure code [D160KB] (Backup lamp relay output: Short circuit)
  • Failure code [D191KA] (Joystick steering neutral safety relay: Disconnection)
  • Failure code [D191KB] (Joystick steering neutral safety relay: Short circuit)
  • Failure code [D191KY] (Joystick steering neutral safety relay: Short circuit with power supply line)
  • Failure code [D192KA] (ECSS solenoid: Disconnection)
  • Failure code [D192KB] (ECSS solenoid: Short circuit)
  • Failure code [D192KY] (ECSS solenoid: Short circuit with power supply line)
  • Failure code [D193KA] (Joystick steering solenoid cut-off relay: Disconnection)
  • Failure code [D193KB] (Joystick steering solenoid cut-off relay: Short circuit)
  • Failure code [D193KY] (Joystick steering solenoid cut-off relay: Short circuit with power supply line)
  • Failure code [D5ZHKA] (Terminal C signal: Disconnection)
  • Failure code [D5ZHKB] (Terminal C signal: Short circuit)
  • Failure code [D5ZHKZ] (Terminal C signal: Disconnection or short circuit)
  • Failure code [D5ZHL6] (Terminal C signal: Signal does not match engine running or stopped state)
  • Failure code [DA80L4] (Auto grease controller: ON/OFF signals disagree)
  • Failure code [DAF3KK] (Machine monitor: Low source voltage (input))
  • Failure code [DAF5KP] (Machine monitor: Low output voltage)
  • Failure code [DAQ0KK] (Transmission controller: Low source voltage)
  • Failure code [DAQ0KT] (Transmission controller: Abnormality in controller)
  • Failure code [DAQ2KK] (Transmission controller load power supply line: Low source voltage (input))
  • Failure code [DAQRMA] (Transmission controller option setting: Malfunction)
  • Failure code [DB90KK] Work equipment controller: Low source voltage (input)
  • Failure code [DB90KT] Work equipment controller: Abnormality in controller
  • Failure code [DB92KK] Work equipment controller load power supply line: Low source voltage (input)
  • Failure code [DB95KX] Work equipment controller power supply output: Out of input signal range
Failure code [DB9RMA] (Work equipment controller option setting: Malfunction)1 topic
  • engine controller and machine monitor: Defective operation)
Failure code [DD15LD] t switch (Panel switch 1): Switch is kept pressed for long time
Failure code [DD16LD] U switch (Panel switch 2): Switch is kept pressed for long time
Failure code [DD17LD] < switch (Panel switch 3): Switch is kept pressed for long time
Failure code [DD18LD] > switch (Panel switch 4): Switch is kept pressed for long time1 topic
  • Switch is kept pressed for long time
Failure code [DD1CLD] Load meter subtotal switch: Switch is kept pressed for long time
Failure code [DD1FLD] Load meter mode selector switch (A/B): Switch is kept pressed for long time
Failure code [DD1GLD] Load meter mode selector switch (+/–): Switch is kept pressed for long time
Failure code [DD1HLD] (Load meter display selector switch: Switch is kept pressed for long time)
Failure code [DD1NLD] (Fan reverse switch: Switch is kept pressed for long time)
Failure code [DD1NL4] (Fan automatic reverse switch: Switch is kept pressed for long time)
Failure code [DDB6L4] (Parking brake switch (Neutralizer): ON/OFF signals disagree)1 topic
  • Switch is kept pressed for long time)
Failure code [DDE5MA] (Emergency steering drive switch: Malfunction)
Failure code [DDK3KA] (Right FNR switch: Disconnection)
Failure code [DDK4KA] (Joystick steering FNR switch: Disconnection)
Failure code [DDK5L4] (Joystick steering shift-up/down switch: ON/OFF signals disagree)
Failure code [DDK6KA] (FNR lever switch: Disconnection)
Failure code [DDK6KB] (FNR lever switch: Short circuit)
Failure code [DDS5KA] (Steering pressure switch signal: Disconnected)
Failure code [DDS5KB] (Steering pressure switch signal: Short circuit)
Failure code [DDT0L4] (Shift mode selector switch: ON/OFF signals disagree)
Failure code [DDT4LD] (Transmission cut-off set switch: Switch is kept pressed for long time)
Failure code [DDW9LD] (Kick-down switch: Switch is kept pressed for long time)
Failure code [DDWLLD] (Hold switch: Switch is kept pressed for long time)
Failure code [DDY0LD] (Load meter cancel switch: Switch is kept pressed for long time)
Failure code [DF10KA] (Transmission shift lever switch: Disconnected)
Failure code [DF10KB] (Transmission shift lever switch: Short circuit)
Failure code [DGF1KA] (Transmission oil temperature sensor: Disconnected)
Failure code [DGF1KB] (Transmission oil temperature sensor: Short circuit)
Failure code [DGH2KX] (Hydraulic oil temperature sensor: Out of input signal range)
Failure code [DGR2KA] (Rear brake oil temperature sensor: Disconnected)
Failure code [DGR2KX] (Rear brake oil temperature sensor: Out of input signal range)
Failure code [DGT1KX] (Torque converter oil temperature sensor: Out of input signal range)
Failure code [DH21KA] (Loader pump pressure sensor: Disconnection)
Failure code [DH21KB] (Loader pump pressure sensor: Power supply line short)
Failure code [DHPCKX] (Lift arm cylinder bottom pressure sensor: Out of input signal range)
Failure code [DHPDKX] (Lift arm cylinder head pressure sensor: Out of input signal range)
Failure code [DHT1KX] (Transmission cut-off pressure sensor: Out of input signal range)
Failure code [DHT8KA] (Steering pump pressure sensor: Disconnection)
Failure code [DHT8KB] (Steering pump pressure sensor: Short circuit)
Failure code [DK59KA] (Lift arm EPC lever potentiometer (Main): Disconnection)
Failure code [DK59KY] (Lift arm EPC lever potentiometer (Main): Short circuit with power supply line)
Failure code [DK59L8] (Lift arm EPC lever potentiometer (Main): Analog signals disagree)
Failure code [DK5AKA] (Lift arm EPC lever potentiometer (Sub): Disconnection)
Failure code [DK5AKY] (Lift arm EPC lever potentiometer (Sub): Short circuit with power supply line)
Failure code [DK5BKA] (Bucket EPC lever potentiometer (Main): Disconnection)
Failure code [DK5BKY] (Bucket EPC lever potentiometer (Main): Short circuit with power supply line)
Failure code [DK5BL8] (Bucket EPC lever potentiometer (Main): Analog signals disagree)52 topics
  • Failure code [DK5CKA] (Bucket EPC lever potentiometer (Sub): Disconnection)
  • Failure code [DK5CKY] (Bucket EPC lever potentiometer (Sub): Short circuit with power supply line)
  • Failure code [DK5FKA] (Joystick steering EPC lever potentiometer (Main): Disconnection)
  • Failure code [DK5GKA] (Joystick steering EPC lever potentiometer (Sub): Disconnection)
  • Failure code [DK5FL8] (Joystick steering EPC lever potentiometer (Main): Analog signals disagree)
  • Failure code [DKA0KA] (Lift arm angle sensor: Disconnection)
  • Failure code [DKA0KY] (Lift arm angle sensor: Short circuit with power supply line)
  • Failure code [DKA0L0] (Lift arm angle sensor: Double meshing)
  • Failure code [DLF1KA] (Transmission input speed sensor: Disconnection)
  • Failure code [DLF1LC] (Transmission input speed sensor: Short circuit)
  • Failure code [DLM3KA] (Fan speed sensor: Disconnection)
  • Failure code [DLM3LC] (Fan speed sensor: Short circuit)
  • Failure code [DLT3KA] (Transmission output speed sensor: Disconnection)
  • Failure code [DLT3LC] (Transmission output speed sensor: Out of input signal range)
  • Failure code [DT20KB] (Transmission cut-off indicator lamp: Short circuit)
  • Failure code [DUM1KB] (Remote positioner raise set indicator lamp: Short circuit)
  • Failure code [DUM2KB] (Remote positioner lower set indicator lamp: Short circuit)
  • Failure code [DV00KB] (Alarm buzzer: Short circuit)
  • Failure code [DW4PKA] (Lift arm raise EPC solenoid: Disconnection)
  • Failure code [DW4PKB] (Lift arm raise EPC solenoid: Short circuit)
  • Failure code [DW4PKY] (Lift arm raise EPC solenoid: Short circuit with power supply line)
  • Failure code [DW4QKA] (Lift arm lower EPC solenoid: Disconnection)
  • Failure code [DW4QKB] (Lift arm lower EPC solenoid: Short circuit)
  • Failure code [DW4QKY] (Lift arm lower EPC solenoid: Short circuit with power supply line)
  • Failure code [DW4RKA] (Bucket tilt EPC solenoid: Disconnection)
  • Failure code [DW4RKB] (Bucket tilt EPC solenoid: Short circuit)
  • Failure code [DW4RKY] (Bucket tilt EPC solenoid: Short circuit with power supply line)
  • Failure code [DW4SKA] (Bucket dump EPC solenoid: Disconnection)
  • Failure code [DW4SKB] (Bucket dump EPC solenoid: Short circuit)
  • Failure code [DW4SKY] (Bucket dump EPC solenoid: Short circuit with power supply line)
  • Failure code [DW7BKA] (Fan reverse solenoid: Disconnection)
  • Failure code [DW7BKB] (Fan reverse solenoid: Short circuit)
  • Failure code [DW7BKY] (Fan reverse solenoid: Short circuit with power supply line)
  • Failure code [DWM1KA] (Work equipment neutral lock solenoid: Disconnection)
  • Failure code [DWM1KB] (Work equipment neutral lock solenoid: Short circuit)
  • Failure code [DWM1KY] (Work equipment neutral lock solenoid: Short circuit with power supply line)
  • Failure code [DWN6KA] (Lift arm raise magnet detent solenoid: Disconnection)
  • Failure code [DWN6KB] (Lift arm raise magnet detent solenoid: Short circuit)
  • Failure code [DWN6KY] (Lift arm raise magnet detent solenoid: Short circuit with power supply line)
  • Failure code [DWN7KA] (Lift arm float magnet detent solenoid: Disconnection)
  • Failure code [DWN7KB] (Lift arm float magnet detent solenoid: Short circuit)
  • Failure code [DWN7KY] (Lift arm float magnet detent solenoid: Short circuit with power supply line)
  • Failure code [DWN8KA] (Bucket tilt magnet detent solenoid: Disconnection)
  • Failure code [DWN8KB] (Bucket tilt magnet detent solenoid: Short circuit)
  • Failure code [DWN8KY] (Bucket tilt magnet detent solenoid: Shorted with the power source)
  • Failure code [DX16KA] (Fan pump EPC solenoid: Disconnection)
  • Failure code [DX16KB] (Fan pump EPC solenoid: Short circuit)
  • Failure code [DX16KY] (Fan pump EPC solenoid: Short circuit with power supply line)
  • Failure code [DXA1KA] (Loader pump PC-EPC solenoid: Disconnection)
  • Failure code [DXA1KB] (Loader pump PC-EPC solenoid: Short circuit)
  • Failure code [DXANKA] (Steering pump PC-EPC solenoid: Disconnection)
  • Failure code [DXANKB] (Steering pump PC-EPC solenoid: Short circuit)
Failure code [DXH1KA] (Lockup ECMV solenoid: Disconnection)
Failure code [DXH1KB] (Lockup ECMV solenoid: Short circuit)
Failure code [DXH1KY] (Lockup ECMV solenoid: Short circuit with power supply line)
Failure code [DXH4KA] (1st clutch ECMV solenoid: Disconnection)
Failure code [DXH4KB] (1st clutch ECMV solenoid: Short circuit)
Failure code [DXH4KY] (1st clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXH5KA] (2nd clutch ECMV solenoid: Disconnection)
Failure code [DXH5KB] (2nd clutch ECMV solenoid: Short circuit)
Failure code [DXH5KY] (2nd clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXH6KA] (3rd clutch ECMV solenoid: Disconnection)
Failure code [DXH6KB] (3rd clutch ECMV solenoid: Short circuit)
Failure code [DXH6KY] (3rd clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXH7KA] (R clutch ECMV solenoid: Disconnection)
Failure code [DXH7KB] (R clutch ECMV solenoid: Short circuit)
Failure code [DXH7KY] (R clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXH8KA] (F clutch ECMV solenoid: Disconnection)
Failure code [DXH8KB] (F clutch ECMV solenoid: Short circuit)
Failure code [DXH8KY] (F clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXHHKA] (4th clutch ECMV solenoid: Disconnection)
Failure code [DXHHKB] (4th clutch ECMV solenoid: Short circuit)
Failure code [DXHHKY] (4th clutch ECMV solenoid: Short circuit with power supply line)
Failure code [DXHLKA] (Joystick steering right EPC solenoid: Disconnection)
Failure code [DXHLKB] (Joystick steering right EPC solenoid: Short circuit)
Failure code [DXHLKY] (Joystick steering right EPC solenoid: Short circuit with power supply line)
Failure code [DXHMKA] (Joystick steering left EPC solenoid: Disconnection)
Failure code [DXHMKB] (Joystick steering left EPC solenoid: Short circuit)
Failure code [DXHMKY] (Joystick steering left EPC solenoid: Short circuit with power supply line)
Failure code [DY30MA] Motor-driven emergency steering pump failure (During operation of machine)
Failure code [DY30MC] Motor-driven emergency steering pump failure (Malfunction in manual mode)
Failure code [DY30ME] Emergency steering: Operating for more than 1 minute
Installing positions of fuses
Information in troubleshooting table
Engine does not start
Wiper does not operate
Windshield washer does not operate
Headlamp, clearance lamp, tail lamp, and license lamp do not light up or go off
Working lamp does not light up or go off
Turn signal lamp and hazard lamp do not light up or go off
Brake lamp does not light or it keeps lighting up
Backup lamp does not light or it keeps lighting up
Backup buzzer does not sound or it keeps sounding
Horn does not sound or it keeps sounding
Alarm buzzer does not sound or it keeps sounding
Air conditioner does not operate or stop
The KOMTRAX system does not work properly
When kick-down switch is turned ON, kick-down operation does not start
When hold switch is pressed, holding operation does not start1 topic
  • while parking brake is applied
Transmission cut-off mode cannot be set or reset
Transmission cut-off set cannot be reset
FNR switch mode cannot be set or reset
Fan reverse function cannot be used or reset
Discharge from loader pump does not rise from minimum level
ECSS function cannot be used or reset
When parking brake is turned ON, parking brake indicator lamp does not light up50 topics
  • When emergency brake operates, brake oil pressure caution lamp does not operate
  • Air cleaner clogging indicator lamp does not light up
  • Radiator coolant level caution lamp does not light up
    • not light up
    • caution lamp does not light up
  • Steering oil pressure caution lamp does not light up
  • Abnormality in t switch (panel switch 1) input
  • Abnormality in U switch (panel switch 2) input
  • Abnormality in < switch (panel switch 3) input
  • Abnormality in > switch (panel switch 4) input
  • Method of using troubleshooting chart
  • Table of failure and causes
  • The machine does not start
  • Torque converter lockup is not switched off (engine stalls) [Machine with lockup clutch (if equipped)]
  • Torque converter lockup is not switched on [Machine with lockup clutch (if equipped)]
    • the gear is not shifted
  • Shocks are large at the times of starting and shifting gear
  • Time lag is large at the times of starting and shifting gear
  • The torque converter oil temperature is high
  • Steering does not turn
  • Steering does not turn [Machine with joystick steering (if equipped)]
  • Steering response is poor
  • Turning, response of steering is poor [machine with joystick steering (if equipped)]
  • Steering is heavy
  • When machine turns, it shakes or makes large shocks
  • The wheel brake does not work or does not work well
  • The wheel brake is not released or it drags
  • The parking brake does not work or does not work well
  • The parking brake is not released or it drags (including emergency release system)
  • Lift arm does not rise
  • Lift arm speed is low or rising force of lift arm is insufficient
  • When rising, the lift arm comes to move slowly at specific height
  • The lift arm cylinder cannot hold down the bucket (Bucket floats)
  • Hydraulic drifts of the lift arm is large
  • The lift arm wobbles during operation
  • Bucket does not tilt back
  • Bucket speed is low or tilting back force is insufficient
  • The bucket comes to operate slowly in the midst of tilting-back
  • The bucket cylinder cannot hold down the bucket
  • Hydraulic drifts of the bucket is large
  • The bucket wobbles during travel with cargo (The work equipment valve is set to “HOLD”)
  • Lift arm and bucket control levers do not move smoothly and are heavy
  • During operation of the machine, engine speed lowers remarkably or engine stalls
  • Large shock is made when work equipment starts and stops
  • When work equipment circuit is relieved singly, other work equipment moves
  • ECSS does not operate, and pitching, bouncing occur
  • Starting performance is poor
  • Engine does not start
  • Engine does not pick up smoothly
  • Engine stops during operation
Engine does not rotate smoothly
Engine lacks output (or lacks power)
Exhaust smoke is black (Incomplete combustion)
Oil is consumed much (or exhaust gas color is blue)
Engine oil becomes contaminated quickly
Fuel consumption is excessive
Coolant contains oil (blows back or reduces)
Oil pressure drops
Oil level rises (Water, fuel in oil)
Coolant temperature rises too high (Overheating)
Abnormal noise is made
Vibration is excessive
How to read this manual
Coating materials list
Special tools list
Sketches of special tools
Removal and installation of engine assembly
Removal and installation of engine hood assembly
Removal and installation of radiator assembly
Removal and installation of aftercooler assembly
Removal and installation of oil cooler assembly
Removal and installation of cooling fan and drive motor assembly
Removal and installation of fuel supply pump assembly
Removal and installation of fuel injector assembly
Removal and installation of cylinder head assembly
Removal and installation of engine front oil seal
Removal and Installation of engine rear oil seal
Removal and installation of fuel tank assembly
Removal and installation of torque converter and transmission assembly
Disassembly and assembly of torque converter and transmission assembly
Disassembly and assembly of torque converter assembly (Standard specification)
Disassembly and assembly of torque converter assembly (Lockup specification)
Disassembly and assembly of clutch pack assembly
Removal and installation of front axle assembly
Removal and installation of rear axle assembly
Disassembly and assembly of axle housing assembly
Disassembly and assembly of differential assembly
Removal and installation of parking brake disc and plate
Removal and installation of center hinge pin
Removal and installation of counterweight
Removal and installation of steering demand valve assembly
Removal and installation of work equipment valve assembly
Removal and installation of brake charge valve assembly
Removal and installation of hydraulic tank assembly
Removal and installation of steering and power train pump assembly
Removal and installation of work equipment and cooling fan pump assembly
Disassembly and assembly of hydraulic cylinder assembly23 topics
  • Removal and installation of work equipment assembly
  • Removal and installation of operator's cab and floor frame assembly
  • Removal and installation of operator's cab glass (stuck glass)
  • Disassembly and assembly of operator's seat assembly
  • Removal and installation of air conditioner unit assembly
  • Removal and installation of engine controller assembly
  • Removal and installation of transmission controller assembly
  • Removal and installation of KOMTRAX terminal assembly
  • Power train hydraulic circuit diagram
  • Automatic greasing circuit diagram
  • Hydraulic circuit diagram
  • Electrical circuit diagram (1/10)
  • Electrical circuit diagram (2/10)
  • Electrical circuit diagram (3/10)
  • Electrical circuit diagram (4/10)
  • Electrical circuit diagram (5/10)
  • Electrical circuit diagram (6/10)
  • Electrical circuit diagram (7/10)
  • Electrical circuit diagram (8/10)
  • Electrical circuit diagram (9/10)
  • Electrical circuit diagram (10/10)
  • Work equipment controller system electrical circuit diagram
  • Connector list and stereogram

Inside this manual

Real pages from this service manual (1,786 pages). Open the sample pages (PDF, 1572 KB)

Sample pages from the Komatsu WA470-6LC, WA480-6LC Wheel Loader Service Manual: Specifications, Troubleshooting, Diagram, Foldout diagram
  • Specifications, page 641: 103 Testing and adjusting, Part 3
  • Troubleshooting, page 857: 303 Troubleshooting by failure code (Display of code), Part 3
  • Diagram, page 1,316: 400 Troubleshooting of electrical system (E-mode)
  • Foldout diagram, page 1,786: Connector list and stereogram

This is a service manual

Here's how it compares to the other manual types.

This manual

Service manual

Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.

Operator's manual

Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.

Parts manual

Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.

Engine service manuals are sometimes sold separately, since certain machine models were offered with more than one engine option.

What it's used for

Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.

Service shops and owner/operators who repair their own equipment

Identifying correct parts and seeing how assemblies come apart and go back together

Keeping equipment running with less downtime

Factory manual, 1,786 pages

Quantity one is the manual described above.

Fast free USA shipping

Ships in 1 business day.

60-day returns

Free if the mistake is ours. A manual ordered in error must come back unopened in its shrink-wrap; you pay return shipping and a 20% restocking fee applies. Return policy

Binder not included

Manuals over about 300 pages may need a standard 3-ring binder, which you can buy locally to keep the pages organized for shop use.

Questions about model, serial number, engine coverage or contents? Contact us before purchasing and we'll help confirm it's the right manual. Please verify the manual type, machine model, serial number range and engine coverage before purchasing: manuals ordered in error carry a 20% restocking fee (return policy).