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Komatsu WA470-7 with 6D125E-6 Engine Wheel Loader Service Manual

2,349 pages · Publication CEBM027201

$239.81
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Models
WA470-7 with 6D125E-6 Engine
Serial coverage
A47001 and up
Manual type
Service Manual
Pages
2,349
Publication
CEBM027201
Condition
Brand new
Komatsu WA470-7 with 6D125E-6 Engine Wheel Loader Service Manual, publication CEBM027201

What's inside

From the manual's own table of contents: 381 sections, 700 entries. See sample pages (PDF, 816 KB)

Index and foreword
Foreword, safety and general information
Important safety notice
How to read the shop manual
Explanation of terms for maintenance standard
Handling equipment of fuel system devices
Handling of intake system parts
Handling of hydraulic equipment
Method of disconnecting and connecting of push-pull type coupler
Handling of electrical equipment
How to read electric wire code
Precautions when performing operation
Practical use of KOMTRAX
Standard tightening torque table
List of abbreviation
Conversion table
Specification
Specifications
Specification drawing
Weight table
Table of fuel, coolant, and lubricants
Structure and function
Engine and cooling system
Engine related parts
Show all 381 sections
KVGT
EGR system piping drawing
EGR system circuit diagram
EGR valve
EGR cooler
KCCV layout drawing
KCCV ventilator
KDPF
Cooling system
Cooling fan pump
Cooling fan motor
Power train
Power train system
Drive shaft
Power train piping drawing
Transmission control
Torque converter
Transmission
Transmission control valve
Forward and reverse clutch ECMV and 1st and 2nd clutch ECMV
3rd, 4th clutch ECMV
Lockup clutch ECMV
Main relief and torque converter relief valve
Axle
Differential
Final drive
Steering system
Layout of steering parts
Steering column6 topics
  • Steering pump
  • Steering valve
  • Orbit-roll valve
  • Stop valve
  • Emergency steering motor
  • Emergency steering pump
Brake system10 topics
  • Layout of brake parts
  • Charge valve
  • Brake valve
  • Slack adjuster
  • Accumulator (for brake)
  • Brake
  • Parking brake control
  • Parking brake
  • Parking brake solenoid valve
  • Parking brake emergency release valve
Undercarriage and frame2 topics
  • Axle mount and center hinge pin
  • Tire
Hydraulic system12 topics
  • Hydraulic component layout
  • Work equipment control
  • Hydraulic tank
  • Double type gear pump
  • Work equipment pump
  • Control valve
  • CLSS
  • Hydraulic circuit diagram and names of valves
  • Accumulator charge valve
  • Work equipment lock solenoid valve
  • Accumulator (for PPC circuit)
  • Accumulator (for ECSS)
Work equipment3 topics
  • Work equipment linkage
  • Bucket
  • Bucket positioner and boom positioner
Cab and its attachments1 topic
  • ROPS cab
Electrical system15 topics
  • Engine control system
  • Preheating system
  • Engine power mode selector circuit
  • Engine output limit function
  • Automatic warm-up function
  • Parking brake control system
  • System operating lamp function
  • Battery disconnect switch function
  • Transmission controller system
  • Work equipment control system
  • Machine monitor system
  • Rear view monitor system
  • KOMTRAX system
  • System component parts
  • Sensor
Standard value tables
Standard service value table1 topic
  • Standard value table for engine
Standard value table for machine
Standard value table for electrical system
Testing and adjusting
General information on testing and adjusting
Tools for testing and adjusting
Sketch of tools for testing and adjusting
Testing engine speed
Testing boost pressure
Testing exhaust gas color
Testing and adjusting valve clearance
Testing compression pressure
Testing blowby pressure
Testing engine oil pressure
Testing EGR valve and KVGToil pressures
Testing fuel pressure
Testing fuel return rate and leakage
Bleeding air from fuel system
Testing fuel circuit for leakage
Handling cylinder cutout mode operation
Handling no injection cranking operation
Testing of KDPF and muffler stack for looseness and damage
Testing of installed condition of cylinder head and manifolds
Testing engine piping for damage and looseness
Testing and adjusting air conditioner compressor belt tension
Testing and adjusting alternator belt tension
Procedures for cleaning fuel doser
Writing compensation values at replacement of injector and engine controller
Adjusting transmission output speed sensor
Adjusting transmission input speed sensor
Flushing procedure for torque converter and transmission hydraulic circuit
Retrieval of disabled machine due to transmission valve failure
Testing oil leakage from axle final drive
Testing drive shaft for looseness, backlash, and damage
Testing and adjusting power train oil pressure
Testing directional lever
Testing steering wheel
Testing work equipment control lever
Testing and adjusting steering circuit oil pressure
Bleeding air from steering cylinder circuit
Testing and adjusting steering stopper valve
Testing brake pedal
Testing and adjusting brake pedal linkage
Testing braking performance
Testing and adjusting of accumulator charge pressure
Testing wheel brake oil pressure
Testing lowering of wheel brake pressure
Testing wear of wheel brake disc
Bleeding air from wheel brake circuit
Releasing remaining pressure in brake accumulator circuit
Testing parking brake performance
Testing parking brake oil pressure
Testing wear of parking brake disc15 topics
  • Method of releasing parking brake manually
  • Testing fan speed
  • Testing fan pump circuit oil pressure
  • Bleeding air from hydraulic fan circuit
  • Testing and adjusting work equipment EPC oil pressure
  • Testing and adjusting work equipment oil pressure
  • Bleeding air from work equipment circuit
  • Releasing remaining pressure from work equipment circuit
  • Testing and adjusting bucket position detection lever
  • Testing and adjusting boom position detection lever
  • Special functions of machine monitor
  • Adjusting rearview camera angle
  • Handling voltage circuit of engine controller
  • Handling battery disconnect switch
  • Testing diodes
Pm clinic2 topics
  • Pm Clinic service
  • Check sheet
Troubleshooting
General information on troubleshooting16 topics
  • Troubleshooting points
  • Sequence of events in troubleshooting
  • Check before troubleshooting
  • Inspection procedure before troubleshooting
  • Preparation work for troubleshooting of electrical system
  • Classification and procedures for troubleshooting
  • Symptom and troubleshooting numbers
  • Information in troubleshooting table
  • Connector list and layout
  • Connector contact identification
  • T-branch box and T-branch adapter table
  • Fuse location table
  • Precautions for KDPF (KCSF and KDOC) Cleaning and Replacement
  • Precautions on troubleshooting of machine monitor
  • Fabrication of short-circuit connector (for CA1883 and CA3135)
  • Failure codes table
Troubleshooting by failure code (Display of code)10 topics
  • Failure code [1500L0] Double Engagement of T/M Clutches
  • Failure code [15SAL1] Release Trouble of ECMV (Forward)
  • Failure code [15SALH] Malfunction of ECMV (Forward)
  • Failure code [15SBL1] Release Trouble of ECMV (Reverse)
  • Failure code [15SBLH] Malfunction of ECMV (Reverse)
  • Failure code [15SEL1] Release Trouble of ECMV (1st)
  • Failure code [15SELH] Malfunction of ECMV (1st)
  • Failure code [15SFL1] Release Trouble of ECMV (2nd)
  • Failure code [15SFLH] Malfunction of ECMV (2nd)
  • Failure code [15SGL1] Release Trouble of ECMV (3rd)
Failure code [15SGLH] Malfunction of ECMV (3rd)
Failure code [15SHL1] Release Trouble of ECMV (4th)
Failure code [15SHLH] Malfunction of ECMV (4th)
Failure code [2F00MA] Failure of Parking Brake Circuit
Failure code [2G42ZG] Accumulator Oil Pressure Low (Front)
Failure code [2G43ZG] Accumulator Oil Pressure Low (Rear)
Failure code [879AKA] A/C Inner Sensor Open Circuit
Failure code [879AKB] A/C Inner Sensor Short Circuit
Failure code [879BKA] A/C Outer Sensor Open Circuit
Failure code [879BKB] A/C Outer Sensor Short Circuit
Failure code [879CKA] Ventilating Sensor Open Circuit
Failure code [879CKB] Ventilating Sensor Short Circuit
Failure code [879DKZ] Sunlight Sensor Open or Short Circuit
Failure code [879EMC] Ventilation Damper Abnormality
Failure code [879FMC] Air Mix Damper Abnormality
Failure code [989A00] Engine Overrun Prevention Activated
Failure code [989L00] Engine Controller Lock Caution 1
Failure code [989M00] Engine Controller Lock Caution 2
Failure code [989N00] Engine Controller Lock Caution 3
Failure code [A1U0N3] HC Desorb Request 1
Failure code [A1U0N4] HC Desorb Request 2
Failure code [AA10NX] Air Cleaner Clogging
Failure code [B@BAZG] Eng Oil Press Low
Failure code [B@BAZK] Eng Oil Level Low
Failure code [B@BCNS] Eng Water Overheat
Failure code [B@BCZK] Eng Water Level Low
Failure code [B@CENS] T/C Oil Temp. Overheat
Failure code [B@HANS] HYD Oil Temp. Overheat
Failure code [CA115] Eng Ne and Bkup Speed Sens Error
Failure code [CA122] Chg Air Press Sensor High Error
Failure code [CA123] Chg Air Press Sensor Low Error
Failure code [CA131] Throttle Sensor High Error
Failure code [CA132] Throttle Sensor Low Error
Failure code [CA135] Eng Oil Press Sensor High Error
Failure code [CA141] Eng Oil Press Sensor Low Error
Failure code [CA144] Coolant Temp Sens High Error
Failure code [CA145] Coolant Temp Sens Low Error
Failure code [CA153] Chg Air Temp Sensor High Error
Failure code [CA154] Chg Air Temp Sensor Low Error
Failure code [CA187] Sensor 2 Supply Volt Low Error
Failure code [CA221] Ambient Press Sensor High Error
Failure code [CA222] Ambient Press Sensor Low Error
Failure code [CA227] Sensor 2 Supply Volt High Error
Failure code [CA234] Eng Overspeed
Failure code [CA238] Ne Speed Sensor Supply Volt Error
Failure code [CA239] Ne Speed Sens Supply Volt High Error
Failure code [CA271] IMV/PCV1 Short Error
Failure code [CA272] IMV/PCV1 Open Error
Failure code [CA273] PCV2 Short Error
Failure code [CA274] PCV2 Open Error
Failure code [CA322] Inj #1(L#1) Open/Short Error
Failure code [CA323] Inj #5(L#5) Open/Short Error
Failure code [CA324] Inj #3(L#3) Open/Short Error
Failure code [CA325] Inj #6(L#6) Open/Short Error
Failure code [CA331] Inj #2(L#2) Open/Short Error
Failure code [CA332] Inj #4(L#4) Open/Short Error
Failure code [CA343] ECM Critical Internal Failure
Failure code [CA351] Injectors Drive Circuit Error
Failure code [CA352] Sensor 1 Supply Volt Low Error59 topics
  • Failure code [CA356] Mass Air Flow Sensor High Error
  • Failure code [CA357] Mass Air Flow Sensor Low Error
  • Failure code [CA386] Sensor 1 Supply Volt High Error
  • Failure code [CA431] Idle Validation Sw Error
  • Failure code [CA432] Idle Validation Process Error
  • Failure code [CA441] Battery Voltage Low Error
  • Failure code [CA442] Battery Voltage High Error
  • Failure code [CA449] Rail Press Very High Error
  • Failure code [CA451] Rail Press Sensor High Error
  • Failure code [CA452] Rail Press Sensor Low Error
  • Failure code [CA515] Rail Press Sens Sup Volt High Error
  • Failure code [CA516] Rail Press Sens Sup Volt Low Error
  • Failure code [CA553] Rail Press High Error
  • Failure code [CA555] Crankcase Press High Error 1
  • Failure code [CA556] Crankcase Press High Error 2
  • Failure code [CA559] Rail Press Low Error
  • Failure code [CA595] Turbo Speed High Error 2
  • Failure code [CA687] Turbo Speed Low Error
  • Failure code [CA689] Eng Ne Speed Sensor Error
  • Failure code [CA691] Intake Air Temp Sens High Error
  • Failure code [CA692] Intake Air Temp Sens Low Error
  • Failure code [CA697] ECM Internal Temp Sensor High Error
  • Failure code [CA698] ECM Int Temp Sensor Low Error
  • Failure code [CA731] Eng Bkup Speed Sens Phase Error
  • Failure code [CA778] Eng Bkup Speed Sensor Error
  • Failure code [CA1117] Persistent Data Lost Error
  • Failure code [CA1664] KDOC Malfunction
  • Failure code [CA1691] Regeneration Ineffective
  • Failure code [CA1695] Sensor 5 Supply Volt High Error
  • Failure code [CA1696] Sensor 5 Supply Volt Low Error
  • Failure code [CA1843] Crankcase Press Sens High Error
  • Failure code [CA1844] Crankcase Press Sens Low Error
  • Failure code [CA1879] KDPF Delta P Sensor High Error
  • Failure code [CA1881] KDPF Delta P Sensor Low Error
  • Failure code [CA1883] KDPF Delta P Sens In Range Error
  • Failure code [CA1921] KDPF Soot Load High Error 1
  • Failure code [CA1922] KDPF Soot Load High Error 2
  • Failure code [CA1923] Dosing Fuel Valve 1 High Error
  • Failure code [CA1924] Dosing Fuel Valve 1 Low Error
  • Failure code [CA1925] Dosing Fuel Valve 1 In Range Error
  • Failure code [CA1927] Dosing Fuel Press Sens High Error
  • Failure code [CA1928] Dosing Fuel Press Sens Low Error
  • Failure code [CA1942] Crankcase Press Sens In Range Error
  • Failure code [CA1963] Dosing Fuel Valve 1 Servo Error
  • Failure code [CA1977] Fuel Doser Open/Short Error
  • Failure code [CA1993] KDPF Delta Pressure Low Error
  • Failure code [CA2185] Throt Sensor Sup Volt High Error
  • Failure code [CA2186] Throt Sensor Sup Volt Low Error
  • Failure code [CA2249] Rail Press Very Low Error
  • Failure code [CA2265] Fuel Feed Pump Open Error
  • Failure code [CA2266] Fuel Feed Pump Short Error
  • Failure code [CA2271] EGR Valve Pos Sens High Error
  • Failure code [CA2272] EGR Valve Pos Sens Low Error
  • Failure code [CA2349] EGR Valve Solenoid Open Error
  • Failure code [CA2353] EGR Valve Solenoid Short Error
  • Failure code [CA2357] EGR Valve Servo Error
  • Failure code [CA2381] KVGT Pos Sens High Error
  • Failure code [CA2382] KVGT Pos Sens Low Error
  • Failure code [CA2383] KVGT Solenoid Open Error
Failure code [CA2386] KVGT Solenoid Short Error
Failure code [CA2387] KVGT Servo Error
Failure code [CA2555] Grid Htr Relay Volt Low Error
Failure code [CA2556] Grid Htr Relay Volt High Error
Failure code [CA2637] KDOC Face Plugging
Failure code [CA2639] Manual Stationary Regeneration Request
Failure code [CA2732] Dosing Fuel Valve 2 High Error
Failure code [CA2733] Dosing Fuel Valve 2 Low Error
Failure code [CA2741] Dosing Fuel Valve Swap Error
Failure code [CA2765] Inj Trim Data Error
Failure code [CA2878] Dosing Fuel Valve 2 Servo Error
Failure code [CA2881] Dosing Fuel Pressure Low Error 1
Failure code [CA3133] KDPF Outlet Press Sens High Error
Failure code [CA3134] KDPF Outlet Press Sens Low Error
Failure code [CA3135] KDPF Outlet Press Sens In Range Error
Failure code [CA3167] Fuel Doser Degradation
Failure code [CA3251] KDOC Inlet Temp High Error
Failure code [CA3253] KDOC Temp Error - Non Regeneration
Failure code [CA3254] KDOC Outlet Temp High Error 1
Failure code [CA3255] KDPF Temp Error - Non Regeneration
Failure code [CA3256] KDPF Outlet Temp High Error 1
Failure code [CA3311] KDOC Outlet Temp High Error 2
Failure code [CA3312] KDPF Outlet Temp High Error 2
Failure code [CA3313] KDOC Inlet Temp Sensor Low Error
Failure code [CA3314] KDOC Inlet Temp Sens High Error
Failure code [CA3315] KDOC Inlet Temp Sens In Range Error
Failure code [CA3316] KDOC Outlet Temp Sens Low Error
Failure code [CA3317] KDOC Outlet Temp Sens High Error
Failure code [CA3318] KDOC Outlet Temp Sens In Range Error
Failure code [CA3319] KDPF Outlet Temp Sens High Error
Failure code [CA3321] KDPF Outlet Temp Sens Low Error
Failure code [CA3322] KDPF Outlet Temp Sens In Range Error
Failure code [CA3419] Mass Air Flow Sensor Sup Volt High Error
Failure code [CA3421] Mass Air Flow Sensor Sup Volt Low Error
Failure code [D150KA] Disconnection of Emerg. Steering Relay
Failure code [D150KB] Ground Fault of Emerg. Steering Relay
Failure code [D150KY] Hot Short of Emergency Steering Relay
Failure code [D160KA] Disconnection of Backup Lamp Relay Output
Failure code [D160KB] Ground Fault of Backup Lamp Relay Output
Failure code [D160KY] Hot Short of Backup Lamp Relay Output
Failure code [D191KA] Disconnection of Neutral Output Relay
Failure code [D191KB] Ground Fault of Neutral Output Relay
Failure code [D191KY] Hot Short of Neutral Output Relay
Failure code [D192KA] Disconnection of ECSS Solenoid
Failure code [D192KB] Ground Fault of ECSS Solenoid
Failure code [D192KY] Hot Short of ECSS Solenoid
Failure code [D19JKZ] Personal Code Relay Abnormality
Failure code [D1E6KA] Disconnection of Parking Brake Relay
Failure code [D1E6KB] Ground Fault of Parking Brake Relay
Failure code [D1E6KY] Hot Short of Parking Brake Relay
Failure code [D5ZHKA] Failure of Key SW C Signal
Failure code [D5ZHKB] Key SW C Signal Short Circuit
Failure code [D5ZHKZ] Failure of Key SW C Signal
Failure code [D5ZHL6] Disconnection of Key SW C
Failure code [D811MC] KOMTRAX Error
Failure code [D862KA] GPS Antenna Open Circuit
Failure code [D8ALKA] Operating Lamp Open Circuit (KOMTRAX)
Failure code [D8ALKB] Operating Lamp Short Circuit (KOMTRAX)
Failure code [D8AQK4] CAN2 Discon (KOMTRAX) 259 topics
  • Failure code [D8AQKR] CAN2 Discon (KOMTRAX)
  • Failure code [DAF0KT] Abnormality of Non-volatile Memory (MON)
  • Failure code [DAF0MB] Monitor ROM Abnormality
  • Failure code [DAF0MC] Monitor Error
  • Failure code [DAF3KK] Controller Power Source Low (MON)
  • Failure code [DAF8KB] Camera Power Supply Short Circuit
  • Failure code [DAFDKB] Monitor 12V Power Output Short Circuit
  • Failure code [DAFGMC] GPS Module Error
  • Failure code [DAFLKA] Operating Lamp Open Circuit (MON)
  • Failure code [DAFLKB] Operating Lamp Short Circuit (MON)
  • Failure code [DAFQKR] CAN2 Discon (Monitor)
  • Failure code [DAQ0KK] Controller Power Source Low (T/M)
  • Failure code [DAQ0KT] Abnormality of Non-volatile Memory (T/M)
  • Failure code [DAQ0MC] T/M Con Error
  • Failure code [DAQ1KA] Disconnection of Key SW ACC (T/M)
  • Failure code [DAQ2KK] Solenoid Power Source Low (T/M)
  • Failure code [DAQ4KB] Ground Fault of Sol. Self-Holding Relay
  • Failure code [DAQ9KQ] Inconsistency of Model Selection (T/M)
  • Failure code [DAQLKA] Operating Lamp Open Circuit (T/M)
  • Failure code [DAQLKB] Operating Lamp Short Circuit (T/M)
  • Failure code [DAQQKR] CAN2 Discon (Transmission Con)
  • Failure code [DAQRKR] CAN1 Discon (Transmission Con)
  • Failure code [DAQRMA] Inconsistency of Option Selection (T/M)
  • Failure code [DAZ9KQ] A/C Model Selection Abnormality
  • Failure code [DAZQKR] CAN2 Discon (Aircon ECU)
  • Failure code [DB2QKR] CAN2 Discon (Engine Con)
  • Failure code [DB2RKR] CAN1 Discon (Engine Con)
  • Failure code [DB90KK] Drop in BBC Controller Main Power Source
  • Failure code [DB90KT] Abnormality of Non-volatile Memory (BBC)
  • Failure code [DB90MC] BBC Error
  • Failure code [DB91KA] Disconnection of Key SW ACC (BBC)
  • Failure code [DB92KK] Solenoid Power Source Low (BBC)
  • Failure code [DB95KX] Failure of 5 V Power Source 1
  • Failure code [DB96KX] Failure of 5 V Power Source 2
  • Failure code [DB99KQ] Inconsistency of Model Selection (BBC)
  • Failure code [DB9LKA] Operating Lamp Open Circuit (BBC)
  • Failure code [DB9LKB] Operating Lamp Short Circuit (BBC)
  • Failure code [DB9QKR] CAN2 Discon (Bucket Boom Con)
  • Failure code [DB9RKR] CAN1 Discon (Bucket Boom Con)
  • Failure code [DB9RMA] Inconsistency of Option Selection (BBC)
  • Failure code [DBE5KX] Failure of 5V Power Source
  • Failure code [DBE6KX] Failure of 24 V Power Source
  • Failure code [DD1ALD] Ground Fault of Remote Positioner Set SW
  • Failure code [DDAAL6] Discon of Engine Shutdown Secondary Switch
  • Failure code [DDB6L4] Neutral Signal Malfunction
  • Failure code [DDD1LD] Failure of Bucket Positioner Set Switch
  • Failure code [DDK3KA] FNR SW Input Signal Disconnection
  • Failure code [DDK3KB] FNR SW Input Signal Short Circuit
  • Failure code [DDK6KA] FNR Lever Input Signal Disconnection
  • Failure code [DDK6KB] FNR Lever Input Signal Short Circuit
  • Failure code [DDNRKY] Hot Short of Work Equipment Lock SW
  • Failure code [DDT0L4] Failure of Shift Mode Select SW
  • Failure code [DDT4LD] Ground Fault of T/M Cut Off Set SW Signal
  • Failure code [DDT9LD] Ground Fault of T/M Cut Off SW Signal
  • Failure code [DDW9LD] Ground Fault of Kickdown Switch
  • Failure code [DDWLLD] Ground Fault of T/M Shift Hold SW
  • Failure code [DF10KA] Disconnection of Shift Lever Input
  • Failure code [DF10KB] Ground Fault of Shift Lever Input
  • Failure code [DGF1KA] Disconnection of T/M Oil Temp. Sensor
Failure code [DGF1KB] Ground Fault of T/M Oil Temp. Sensor
Failure code [DGH2KX] Out of Range of HYD Oil Temp. Sensor
Failure code [DGR2KB] Ground Fault of Brake Oil Temp. Sensor
Failure code [DGR2KZ] Failure of Brake Oil Temp. Sensor
Failure code [DGT1KA] Disconnection of T/C Oil Temp. Sensor
Failure code [DGT1KB] Ground Fault of T/C Oil Temp. Sensor
Failure code [DH21KA] Failure of Loader Pump Press. Sensor
Failure code [DH21KB] Loader Pump Press. Sensor Short Circuit
Failure code [DHA4KA] Failure of Air Cleaner Sensor Circuit
Failure code [DHPCKX] Out of Range of Boom Bottom Press. Sensor
Failure code [DHPDKX] Out of Range of Boom Head Press. Sensor
Failure code [DHT1KX] Out of Range of T/M Cut Off Press. Sensor
Failure code [DHT5KX] Out of Range of T/C Input Pressure Sensor
Failure code [DHT7KX] Out of Range of T/C Output Pressure Sensor
Failure code [DHT8KA] Failure of Steering Pump Press. Sensor
Failure code [DHT8KB] Steering Pump Press. Sensor Short Circuit
Failure code [DHT8ZG] Steering Oil Pressure Low
Failure code [DHUDKA] Failure of Emrg. Steering Press. Sensor
Failure code [DHUDKB] Emrg. Steering Press. S. Short Circuit
Failure code [DJF1KA] Disconnection of Fuel Level Sensor
Failure code [DK55KA] Failure of FNR Lever Potentio
Failure code [DK55KY] Hot Short of FNR Lever Potentio Circuit
Failure code [DK55L5] Failure of FNR Lever Potentio
Failure code [DK59KA] Failure of Boom Lever Potentio (Main)
Failure code [DK59KY] Hot Short of Boom Lever Potentio (Main)
Failure code [DK59L8] Boom Lever Potentio (Main & Sub) Disagree
Failure code [DK5AKA] Failure of Boom Lever Potentio (Sub)
Failure code [DK5AKY] Hot Short of Boom Lever Potentio (Sub)
Failure code [DK5BKA] Failure of Bucket Lever Potentio (Main)
Failure code [DK5BKY] Hot Short of Bucket Lever Potentio (Main)
Failure code [DK5BL8] Bucket Lever Potentio (Main&Sub) Disagree
Failure code [DK5CKA] Failure of Bucket Lever Potentio (Sub)
Failure code [DK5CKY] Hot Short of Bucket Lever Potentio (Sub)
Failure code [DK5DKA] Failure of 3rd Lever Potentio (Main)
Failure code [DK5DKY] Hot Short of 3rd Lever Potentio (Main)
Failure code [DK5DL8] 3rd Lever Potentio (Main & Sub) Disagree
Failure code [DK5EKA] Failure of 3rd Lever Potentio (Sub)
Failure code [DK5EKY] Hot Short of 3rd Lever Potentio (Sub)
Failure code [DKA0KA] Failure of Boom Angle Sensor
Failure code [DKA0KY] Hot Short of Boom Angle Sensor Circuit
Failure code [DKA0L0] Boom Angle Sensor Dislocation
Failure code [DKA1KA] Failure of Bucket Angle Sensor
Failure code [DKA1KY] Hot Short of Bucket Angle Sensor Circuit
Failure code [DLF1KA] Disconnection of T/M Input Speed Sensor
Failure code [DLF1LC] Failure of T/M Input Speed Sensor
Failure code [DLM3KA] Disconnection of Radiator Fan Speed Sensor
Failure code [DLM3LC] Failure of Radiator Fan Speed Sensor
Failure code [DLT3KA] Disconnection of Output Speed Sens. (Main)
Failure code [DLT3LC] Failure of Output Speed Sensor (Main)
Failure code [DPQ1KR] LIN Discon (Switch Panel)
Failure code [DPQ2KR] LIN Discon (LED Unit)
Failure code [DPQ3KR] LIN Discon (Rear View Monitor)
Failure code [DSJ0KR] CAN2 Discon (Meter Unit)
Failure code [DT20KB] Ground Fault of T/M Cut Off Indicator
Failure code [DT22KB] Ground Fault of Work Equip. Lock Indic
Failure code [DV00KB] Ground Fault of Buzzer Output
Failure code [DW4PKA] Disconnection of Boom EPC Solenoid (Raise)
Failure code [DW4PKB] Ground Fault of Boom EPC Solenoid (Raise)
Failure code [DW4PKY] Hot Short of Boom EPC Solenoid (Raise)59 topics
  • Failure code [DW4QKA] Disconnection of Boom EPC Solenoid (Lower)
  • Failure code [DW4QKB] Ground Fault of Boom EPC Solenoid (Lower)
  • Failure code [DW4QKY] Hot Short of Boom EPC Solenoid (Lower)
  • Failure code [DW4RKA] Disconnection of Bucket EPC Sol. (Tilt)
  • Failure code [DW4RKB] Ground Fault of Bucket EPC Solenoid (Tilt)
  • Failure code [DW4RKY] Hot Short of Bucket EPC Solenoid (Tilt)
  • Failure code [DW4SKA] Disconnection of Bucket EPC Sol. (Dump)
  • Failure code [DW4SKB] Ground Fault of Bucket EPC Solenoid (Dump)
  • Failure code [DW4SKY] Hot Short of Bucket EPC Solenoid (Dump)
  • Failure code [DW7BKA] Disconnection of Fan Reverse Solenoid
  • Failure code [DW7BKB] Ground Fault of Radiator Fan Rev. Sol
  • Failure code [DW7BKY] Hot Short of Radiator Fan Rev. Sol
  • Failure code [DWM1KA] Disconnection of Neutral Lock Solenoid
  • Failure code [DWM1KB] Ground Fault of Neutral Lock Solenoid
  • Failure code [DWM1KY] Hot Short of Neutral Lock Solenoid
  • Failure code [DWN6KA] Disconnection of Detent Solenoid (Boom)
  • Failure code [DWN6KB] Ground Fault of Detent Solenoid (Boom)
  • Failure code [DWN6KY] Hot Short of Detent Solenoid (Boom)
  • Failure code [DWN8KA] Disconnection of Detent Solenoid (Bucket)
  • Failure code [DWN8KB] Ground Fault of Detent Solenoid (Bucket)
  • Failure code [DWN8KY] Hot Short of Detent Solenoid (Bucket)
  • Failure code [DX16KA] Disconnection of Rad. Fan Pump EPC Sol
  • Failure code [DX16KB] Ground Fault of Rad. Fan Pump EPC Sol
  • Failure code [DX16KY] Hot Short of Radiator Fan Pump EPC Sol
  • Failure code [DXA1KA] Disconnection of Loader Pump EPC Solenoid
  • Failure code [DXA1KB] Ground Fault of Loader Pump EPC Solenoid
  • Failure code [DXA1KY] Hot Short of Loader Pump EPC Solenoid
  • Failure code [DXANKA] Disconnection of Steering Pump EPC Sol
  • Failure code [DXANKB] Ground Fault of Steering Pump EPC Solenoid
  • Failure code [DXANKY] Hot Short of Steering Pump EPC Solenoid
  • Failure code [DXH1KA] Disconnection of ECMV Solenoid (Lockup)
  • Failure code [DXH1KB] Ground Fault of ECMV Solenoid (Lockup)
  • Failure code [DXH1KY] Hot Short of ECMV Solenoid (Lockup)
  • Failure code [DXH4KA] Disconnection of ECMV Solenoid (1st)
  • Failure code [DXH4KB] Ground Fault of ECMV Solenoid (1st)
  • Failure code [DXH4KY] Hot Short of ECMV Solenoid (1st)
  • Failure code [DXH5KA] Disconnection of ECMV Solenoid (2nd)
  • Failure code [DXH5KB] Ground Fault of ECMV Solenoid (2nd)
  • Failure code [DXH5KY] Hot Short of ECMV Solenoid (2nd)
  • Failure code [DXH6KA] Disconnection of ECMV Solenoid (3rd)
  • Failure code [DXH6KB] Ground Fault of ECMV Solenoid (3rd)
  • Failure code [DXH6KY] Hot Short of ECMV Solenoid (3rd)
  • Failure code [DXH7KA] Disconnection of ECMV Solenoid (Reverse)
  • Failure code [DXH7KB] Ground Fault of ECMV Solenoid (Reverse)
  • Failure code [DXH7KY] Hot Short of ECMV Solenoid (Reverse)
  • Failure code [DXH8KA] Disconnection of ECMV Solenoid (Forward)
  • Failure code [DXH8KB] Ground Fault of ECMV Solenoid (Forward)
  • Failure code [DXH8KY] Hot Short of ECMV Solenoid (Forward)
  • Failure code [DXHHKA] Disconnection of ECMV Solenoid (4th)
  • Failure code [DXHHKB] Ground Fault of ECMV Solenoid (4th)
  • Failure code [DXHHKY] Hot Short of ECMV Solenoid (4th)
  • Failure code [DXHJKA] Disconnection of 3rd EPC Solenoid (EXT)
  • Failure code [DXHJKB] Ground Fault of 3rd EPC Solenoid (EXT)
  • Failure code [DXHJKY] Hot Short of 3rd EPC Solenoid (EXT)
  • Failure code [DXHKKA] Disconnection of 3rd EPC Solenoid (RET)
  • Failure code [DXHKKB] Ground Fault of 3rd EPC Solenoid (RET)
  • Failure code [DXHKKY] Hot Short of 3rd EPC Solenoid (RET)
  • Failure code [DY30MA] Malfunction 1 of Emerg. Steering Motor
  • Failure code [DY30MC] Malfunction 2 of Emerg. Steering Motor
Failure code [DY30ME] Emerg. Steering Long-Time Activated
Failure code [LA00L3] Failure of Fan Reverse
Troubleshooting of electrical system (E-mode)
Engine does not start
Manual preheating system does not work
Automatic preheating system does not work
While preheating is working, preheating monitor does not light up
All of LCD unit, LED unit, and meter unit on machine monitor display nothing
LCD unit on machine monitor displays nothing
LCD on machine monitor does not display properly
Meter unit display on machine monitor is abnormal
Night lighting lamp of meter unit on machine monitor is abnormal
Caution LED on machine monitor is abnormal
Two switches operation of switch panel on machine monitor does not function
Switch panel buzzer of machine monitor is abnormal
Rear view monitor does not light up or backlight flickers
Rear view monitor images are not displayed clearly
Rear view monitor brightness cannot be adjusted
Night lighting lamp of rear view monitor is abnormal
Air cleaner clogging indicator lamp does not light
Radiator coolant level caution lamp does not light
Fuel level gauge does not indicate correct level
Seat belt caution lamp indication is abnormal
Horn does not sound
Horn does not stop sounding
Alarm buzzer does not sound
When starting switch is in ON position, alarm buzzer does not stop sounding
Kickdown does not work when kickdown switch is turned ON
The hold switch does not work when it is pressed
Transmission cut-off mode is not selected or not released
Transmission cut-off setting cannot be released
Directional selector (FNR) switch mode is not selected or not released
Flow of loader pump does not increase from the minimum rate
ECSS function cannot be selected or cannot be released
None of headlamp, clearance lamp, and tail lamp lights
Clearance lamp and tail lamp do not light up or go out
Both High and Low beams of headlamp do not light up or go out
Low beam of headlamp does not light up or go out
High beam of headlamp does not light up or go out
Front working lamp does not light up or go out
Rear working lamp does not light up or go out11 topics
  • All of turn signal lamps and hazard lamps do not light up or go out
  • Turn signal lamps do not light up or go out
  • Hazard lamp does not light up or go out
  • Brake lamp does not light or stays lighted
  • Backup lamp does not light up or does not go out
  • Backup buzzer does not sound or continues to sound
  • Front wiper does not operate
  • Rear wiper does not operate
  • Window washer does not operate
  • Fuel feed pump does not operate or stop automatically
  • KOMTRAX system does not operate properly
Troubleshooting of hydraulic and mechanical system (H-mode)35 topics
  • Information described in troubleshooting table (H-mode)
  • System chart of hydraulic and mechanical systems
  • Failure mode and cause table
  • Machine does not move off
  • Torque converter lockup clutch is not disengaged (engine stalls)
  • Torque converter lockup clutch is not engaged
  • Large shock is made when machine starts or gear is shifted
  • Machine starts or gear speed shifts with long time lag
  • Torque converter oil temperature is high
  • Machine does not turn
  • Turning response is poor
  • Steering wheel is heavy to turn
  • Machine sways or large shocks are made while machine turns
  • Turning radius differs between right and left turns
  • Wheel brakes do not work or are weak
  • Wheel brakes are not released or drag
  • Parking brake does not work or it is weak
  • Parking brake is not released or drags (including emergency release system)
  • Boom does not rise
  • Boom moves slow or boom lacks lifting force
  • Rising boom slows down at certain height
  • Lift cylinders do not serve to hold bucket on ground
  • Hydraulic drift of boom is large
  • Boom moves up and down during operation
  • Bucket does not tilt back
  • Bucket moves slow or lacks tilt-back force
  • Bucket decelerates during tilt-back operation
  • Bucket cylinder does not hold bucket on ground
  • Hydraulic drift of bucket is large
  • Boom and bucket control levers do not move smoothly and are heavy to move
  • Large shocks are made when work equipment starts to move and stops
  • E.C.S.S. (travel damper) does not work and machine pitches and bounces
  • Bucket does not stop at the position which is set with remote bucket positioner
  • Fan speed is abnormal (too high or low, or fan does not rotate)
  • Unusual noise is heard from around fan
Troubleshooting of engine (S-mode)3 topics
  • Information mentioned in troubleshooting table (S mode)
  • When starting switch is turned to START position, engine is not cranked
  • The engine cranks but exhaust smoke does not come out
Engine startability is poor
Engine does not pick-up smoothly
Engine stops during operation
Engine runs rough or is unstable
Engine lacks power
KDPF gets clogged in a short time
Engine oil consumption is excessive
Engine oil becomes contaminated early
Fuel consumption is excessive
Oil is in coolant (or coolant spurts or coolant level goes down)
Oil pressure drops
Fuel mixes into engine oil
Water mixes into engine oil (milky)
Coolant temperature rises too high (overheating)
Unusual noise is heard
Vibration is excessive
Air cannot be bled from fuel circuit
Active regeneration is executed frequently
Active regeneration takes a long time
White smoke is exhausted during active regeneration
Disassembly and assembly
General information on disassembly and assembly
How to read this manual
Coating materials list
Special tools list
Sketches of special tools
Removal and installation of supply pump assembly
Removal and installation of injector assembly
Removal and installation of fuel doser assembly
Removal and installation of cylinder head assembly
Removal and installation of engine hood assembly
Removal and installation of grille assembly
Removal and installation of cooling system assembly
Removal and installation of radiator core assembly
Removal and installation of aftercooler
Removal and installation of hydraulic oil cooler
Removal and installation of power train oil cooler assembly
Removal and installation of engine assembly
Removal and installation of engine front oil seal
Removal and installation of engine rear oil seal
Removal and installation of cooling fan and cooling fan motor assembly
Removal and installation of KDPF assembly
Disassembly and assembly of KDPF assembly
Removal and installation of KCCV assembly

Inside this manual

Real pages from this service manual (2,349 pages). Open the sample pages (PDF, 815 KB)

Sample pages from the Komatsu WA470-7 with 6D125E-6 Engine Wheel Loader Service Manual: Troubleshooting, Diagram, Specifications, Foldout diagram
  • Troubleshooting, page 852: (ALL-3840-001-A-00-A)
  • Diagram, page 1,608: Troubleshooting of electrical system (E-mode)
  • Specifications, page 1,788: Troubleshooting of hydraulic and mechanical system (H-
  • Foldout diagram, page 2,329: DIAGRAMS AND SCHEMATICS ELECTRICAL CIRCUIT DIAGRAM OF FLOOR (2/8)

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, 2,349 pages

Quantity one is the manual described above.

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60-day returns

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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.

Other editions and similar models

Komatsu WA470-7Operation & Maintenance Manual · CEAM026702 · $69.97Komatsu WA470-7Operation & Maintenance Manual · TEN00602-04 · $69.59Komatsu PC490LC-10 with 6D125E-6 EngineService Manual · CEBM025304 · $189.65Komatsu WA470-7Service Manual · SEN06006-05 · $259.55

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