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Komatsu WA270-7 with 6D107E-2 Engine Wheel Loader Service Manual

2,060 pages · Publication CEBM027601

$209.79
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Models
WA270-7 with 6D107E-2 Engine
Serial coverage
A27001 and up
Manual type
Service Manual
Pages
2,060
Publication
CEBM027601
Condition
Brand new
Komatsu WA270-7 with 6D107E-2 Engine Wheel Loader Service Manual, publication CEBM027601

What's inside

From the manual's own table of contents: 386 sections, 700 entries. See sample pages (PDF, 974 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 386 sections
KVGT
EGR system piping drawing
EGR system circuit diagram
EGR valve
EGR cooler
KCCV layout drawing
KCCV ventilator
KDPF
Cooling system
Cooling fan motor
Power train
Power train system
Layout of power train parts
Damper
HST pump
HST motor1
HST motor2
Transfer
Clutch solenoid valve
Drive shaft
Axle
Differential
Torque proportional differential
Limited slip differential
Final drive
Steering system
Layout of steering devices
Steering column
Priority valve
Cushion valve3 topics
  • Emergency steering valve
  • Orbitrol valve
  • 2way restrictor valve
Brake system9 topics
  • Layout of brake parts
  • Brake accumulator charge valve
  • Brake valve
  • Brake accumulator
  • Slack adjuster
  • Brake
  • Parking brake control
  • Parking brake
  • Parking brake solenoid valve
Undercarriage and frame3 topics
  • Axle mount
  • Center hinge pin
  • Tire
Hydraulic system13 topics
  • Hydraulic component layout
  • Work equipment control
  • Hydraulic tank
  • Double type gear pump
  • Steering and work equipment pump
  • Control valve
  • CLSS
  • Hydraulic circuit diagram and names of valves
  • Self-pressure reducing valve
  • Work equipment PPC valve
  • Work equipment lock solenoid valve
  • PPC circuit accumulator
  • ECSS accumulator
Work equipment2 topics
  • Work equipment linkage
  • Bucket
Cab and its attachments2 topics
  • ROPS cab
  • Cab mount
Electrical system13 topics
  • Engine control system
  • Preheating system
  • Engine output limit function
  • Automatic warm-up function
  • Parking brake control system
  • System operating lamp function
  • Battery disconnect switch function
  • HSTcontroller system
  • Machine monitor system
  • Rearview monitor system
  • KOMTRAX system
  • System component parts
  • Sensor
Standard value tables
Standard service value table3 topics
  • Standard value table for engine
  • Standard value table for machine
  • Standard value table for electrical system
Testing and adjusting
Related 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 temperature
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 discharge, return 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 heads and manifolds
Testing engine piping for damage and looseness
Testing and adjusting air conditioner compressor belt tension
Replacing alternator belt
Testing oil leakage from axle final drive
Testing drive shaft for looseness, backlash, and damage
Testing accelerator pedal
Testing and adjusting HSToil pressure
Testing transfer clutch control 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 brake pedal
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 wear of parking brake disc
Testing parking brake release pressure
Method of releasing parking brake manually
Testing cooling fan speed
Testing cooling fan pump circuit oil pressure
Bleeding air from hydraulic fan circuit
Testing and adjusting work equipment PPC oil pressure
Testing and adjusting work equipment oil pressure
Bleeding air from work equipment circuit
Releasing remaining pressure from work equipment circuit7 topics
  • Testing and adjusting bucket positioner and bucket proximity switch
  • 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
Related information on troubleshooting15 topics
  • Troubleshooting points
  • Sequence of events in troubleshooting
  • Checks before troubleshooting
  • Inspection procedure before troubleshooting
  • Preparation for troubleshooting of electrical system
  • Classification and procedures for troubleshooting
  • Symptom and troubleshooting numbers
  • Information described 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 when performing troubleshooting of machine monitor
  • Failure codes table
Troubleshooting by failure code (Display of code)18 topics
  • Failure code [2F00MA] Failure of Parking Brake Circuit
  • Failure code [2F00MB] Malfunction of Parking Brake
  • Failure code [2G42ZG] Accumulator Oil Pressure Low (Front)
  • Failure code [2G43ZG] Accumulator Oil Pressure Low (Rear)
  • Failure code [6091NX] HST Oil Filter Clogging
  • Failure code [7RHYKA] Disconnection of Fan Variable Control Sol
  • Failure code [7RHYKB] Ground Fault of Fan Variable Control Sol
  • Failure code [7RHYKY] Hot Short of Fan Variable Control Sol
  • 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 [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 [AB00KE] Charge Voltage Low
Failure code [AB00KY] Hot Short of Alternator R Terminal
Failure code [B@BAZG] Eng Oil Press Low
Failure code [B@BCNS] Eng Water Overheat
Failure code [B@BCZK] Eng Water Level Low
Failure code [B@CRNS] HST 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 [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 [CA295] Ambient Press Sens In Range 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 Error
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 [CA428] Water in Fuel Sensor High Error
Failure code [CA429] Water in Fuel Sensor Low Error
Failure code [CA431] Idle Validation Sw Error
Failure code [CA432] Idle Validation Process Error
Failure code [CA435] Eng Oil Press Sw 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 [CA488] Chg Air Temp High Torque Derate
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 259 topics
  • 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 [CA1942] Crankcase Press Sens In Range 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 [CA2271] EGR Valve Pos Sens High Error
  • Failure code [CA2272] EGR Valve Pos Sens Low Error
  • Failure code [CA2288] Turbo Speed High Error 1
  • Failure code [CA2311] IMV Solenoid 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 [CA2373] Exhaust Manifold Press Sens High error
  • Failure code [CA2374] Exhaust Manifold Press Sens Low error
  • Failure code [CA2375] EGR Orifice Temp Sens High Error
  • Failure code [CA2376] EGR Orifice Temp Sens Low 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 [CA2554] Exh Manifold Press Sens In Range 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 [CA2961] EGR Orifice Temp High Error 1
  • Failure code [CA2973] Chg Air Press Sensor In Range Error
  • 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 [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 [CA3741] Rail Press Valve Trip Error
Failure code [D110L4] Disconnection of Battery Relay Signal
Failure code [D160KA] Disconnection 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 [D1B0KA] Disconnection of HST Safety Relay
Failure code [D1B0KB] Ground Fault of HST Safety Relay
Failure code [D1B0KY] Hot Short of HST Safety Relay
Failure code [D1B0MC] Malfunction of HST Safety Relay
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 [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) 2
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 [DAJ0KK] Controller Power Source Low (HST)
Failure code [DAJ0KT] Abnormality of Non-volatile Memory (HST)
Failure code [DAJ0MC] HST Con Error
Failure code [DAJ1KA] Disconnection of Key SW ACC (HST)
Failure code [DAJ2KK] Solenoid Power Source Low (HST)
Failure code [DAJ4KB] Ground Fault of Sol. Self-Holding Relay
Failure code [DAJ4KZ] Failure of Sol. Self-Holding Relay
Failure code [DAJ5KX] Failure of 5V Power Source 0
Failure code [DAJ6KX] Failure of 5V Power Source 1
Failure code [DAJ9KQ] Inconsistency of Model Selection (HST)
Failure code [DAJLKA] Operating Lamp Open Circuit (HST)
Failure code [DAJLKB] Operating Lamp Short Circuit (HST)59 topics
  • Failure code [DAJQKR] CAN2 Discon ( HST Con)
  • Failure code [DAJRKR] CAN1 Discon ( HST Con)
  • Failure code [DAJRMA] Inconsistency of Option Selection (HST)
  • 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 [DD1ALD] Ground Fault of Remote Positioner Set SW
  • Failure code [DDAAL6] Discon of Engine Shutdown Secondary Switch
  • Failure code [DDB2L4] Stop Lamp Switch Signal Malfunction
  • Failure code [DDB6L4] Parking Brake Signal Malfunction
  • Failure code [DDD7KA] Failure of Variable Speed Control
  • Failure code [DDD7KY] Hot Short of Variable Speed Control
  • 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 [DDNRLD] Ground Fault of Work Equip. Lock Switch
  • Failure code [DF10KA] Disconnection of Speed Range Input
  • Failure code [DF10KB] Ground Fault of Speed Range Input
  • Failure code [DGH1KX] Out of Range of HST Oil Temp. Sensor
  • Failure code [DGR2KB] Ground Fault of Brake Oil Temp. Sensor
  • Failure code [DGR2KZ] Failure of Brake Oil Temp. Sensor
  • Failure code [DHHBKA] Failure of HST Press. Sens. Circuit (MA)
  • Failure code [DHHBKY] Hot Short of HST Press. Sens. Circuit (MA)
  • Failure code [DHHCKA] Failure of HST Press. Sens. Circuit (MB)
  • Failure code [DHHCKY] Hot Short of HST Press. Sens. Circuit (MB)
  • Failure code [DHPCKA] Failure of Boom Press. Sensor (Bottom)
  • Failure code [DHPCKY] Hot Short of Boom Press. Sensor (Bottom)
  • Failure code [DHPEKA] Failure of Steering & Loader Pump Press
  • Failure code [DHPEKY] Hot Short of Steering & Loader Pump Press
  • Failure code [DHS8KA] Failure of Boom Raise PPC Sens. Circuit
  • Failure code [DHS8KY] Hot Short of Boom Raise PPC Sens. Circuit
  • Failure code [DHS9KA] Failure of Boom Lower PPC Sens. Circuit
  • Failure code [DHS9KY] Hot Short of Boom Lower PPC Sens. Circuit
  • Failure code [DHSDKA] Failure of Bucket Dump PPC Sens. Circuit
  • Failure code [DHSDKY] Hot Short of Bucket Dump PPC Sens. Circuit
  • Failure code [DHSNKA] Failure of Bucket Tilt PPC Sens. Circuit
  • Failure code [DHSNKY] Hot Short of Bucket Tilt PPC Sens. Circuit
  • Failure code [DHT8ZG] Steering Oil Pressure Low
  • Failure code [DHTCL6] Failure of HST Oil Filter Sensor 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 [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 [DK70KA] Failure of inching sensor Circuit
  • Failure code [DK70KY] Hot Short of inching sensor Circuit
  • 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 [DLM3KA] Disconnection of Radiator Fan Speed Sensor
  • Failure code [DLM3LC] Failure of Radiator Fan Speed Sensor
  • Failure code [DLT3KX] Vehicle Speed Sensor Circuit Failure (B)
  • Failure code [DLT4KX] Vehicle Speed Sensor Circuit Failure (A)
Failure code [DLT4L0] Vehicle Speed Sensor Failure (A & B)
Failure code [DLT4LC] Vehicle Speed Sensor Failure (A or B)
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 [DT22KB] Ground Fault of Work Equip. Lock Indic
Failure code [DV00KB] Ground Fault of Buzzer Output
Failure code [DW26KA] Disconnection of Motor 2 Solenoid
Failure code [DW26KB] Ground Fault of Motor 2 Solenoid
Failure code [DW26KY] Hot Short of Motor 2 Solenoid
Failure code [DW4BKA] Disconnection of Parking Brake Valve
Failure code [DW4BKB] Ground Fault of Parking Brake Valve
Failure code [DW4BKY] Hot Short of Parking Brake Valve
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 [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 [DX19KA] Disconnection of Motor 1 Solenoid
Failure code [DX19KB] Ground Fault of Motor 1 Solenoid
Failure code [DX19KY] Hot Short of Motor 1 Solenoid
Failure code [DX20KA] Disconnection of Clutch Control Solenoid
Failure code [DX20KB] Ground Fault of Clutch Control Solenoid
Failure code [DX20KY] Hot Short of Clutch Control Solenoid
Failure code [DXAWKA] Disconnection of HST Pump EPC Sol
Failure code [DXAWKB] Ground Fault of HST Pump EPC Sol
Failure code [DXAWKY] Hot Short of HST Pump EPC Sol
Failure code [DXH7KA] Disconnection of Reverse Solenoid
Failure code [DXH7KB] Ground Fault of Reverse Solenoid
Failure code [DXH7KY] Hot Short of Reverse Solenoid
Failure code [DXH8KA] Disconnection of Forward Solenoid
Failure code [DXH8KB] Ground Fault of Forward Solenoid
Failure code [DXH8KY] Hot Short of Forward Solenoid
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 [H2K0KA] Failure of Quick Coupler Lock Signal
Failure code [H2K0KY] Hot Short of Quick Coupler Lock Signal
Failure code [J141N1] Steering Pump Over Run
Failure code [LA00L3] Failure of Fan Reverse
Failure code [M100N1] HST Pump Over Run
Failure code [M400N1] HST Motor 1 Over Run
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 up39 topics
  • 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
  • Rearview monitor does not light up or backlight flickers
  • Rearview monitor images are not displayed clearly
  • Rearview monitor brightness cannot be adjusted
  • Night lighting lamp of rearview monitor is abnormal
  • The HSToil filter clogging caution lamp does not light up
  • 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
  • Setting does not change while operating traction control switch
  • Remote positioner does not work or cannot be released
  • Bucket positioner does not work or cannot be released
  • Direction selector (FNR) switch mode is not selected or not released
  • PZ auto tilt-in does not work
  • Tracktion level does not display MAX when max traction switch is turned ON
  • ECSS function cannot be selected or cannot be released
  • None of headlamp, clearance lamp, and tail lamp lights
  • Clearance lamp, tail lamp and license-plate 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 out
  • All of turn signal lamps and hazard lamps do not flash or go out
  • Turn signal lamps do not flash or go out
  • Hazard lamp does not flash 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
KOMTRAX system does not operate normally
Troubleshooting of hydraulic and mechanical system (H-mode)
Information described in troubleshooting table (H-mode)
System chart of hydraulic and mechanical systems
Failure mode and cause table
Machine does not travel forward or backward
Machine does not travel forward (Machine travels backward normally)
Machine does not travel backward (Machine travels forward normally)
Machine does not travel forward or backward fast
Machine does not travel forward fast (Machine travel backward fast)
Machine does not travel backward fast (Machine travel forward fast)
Machine lacks power neither when traveling forward nor backward
Engine stalls during travel or engine speed drops significantly
Steering wheel is too heavy to turn
Steering wheel is heavy to turn
Machine sways or large shocks are made while machine turns
Machine unintentionally turns when machine travels
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
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 (bucket rises off 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
Bucket tilts back and forth during carrying load (work equipment valve in HOLD)
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
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)
Information described in troubleshooting table (S mode)
Engine does not crank when starting switch is turned to START position
Engine cranks but no exhaust smoke comes out
Engine startability is poor
Engine does not pick up smoothly
Engine stops during operation
Engine runs rough or is unstable16 topics
  • 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 time
  • White smoke is exhausted during active regeneration
Disassembly and assembly
Related information on disassembly and assembly36 topics
  • 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 cylinder head assembly
  • Removal and installation of engine hood assembly
  • Removal and installation of grille assembly
  • Removal and installation of radiator core assembly
  • Removal and installation of aftercooler
  • Removal and installation of hydraulic oil cooler
  • 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 fan motor assembly
  • Removal and installation of KDPF assembly
  • Disassembly and assembly of KDPF assembly
  • Removal and installation of KCCV assembly
  • Removal and installation of air cleaner assembly
  • Removal and installation of KVGT assembly
  • Removal and installation of EGR (Exhaust Gas Recirculation) valve assembly
  • Removal and installation of EGR (Exhaust Gas Recirculation) cooler assembly
  • Removal and installation of alternator belt
  • Removal and installation of fuel tank assembly
  • Removal and installation of transfer assembly
  • Disassembly and assembly of transfer assembly
  • Disassembly and assembly of parking brake assembly
  • Disassembly and assembly of differential assembly
  • Removal and installation of front axle assembly
  • Removal and installation of rear axle assembly
  • Disassembly and assembly of axle housing assembly
  • Removal and installation of center hinge pin
  • Removal and installation of counterweight assembly
  • Removal and installation of hydraulic tank assembly
  • Removal and installation of control valve assembly
Disassembly and assembly of control valve assembly
Removal and installation of hydraulic pump assembly
Removal and installation of HST motor1 assembly
Removal and installation of HST motor2 assembly
Disassembly and assembly of hydraulic cylinder assembly
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 (adhered glass)
Removal and installation of operator's seat assembly
Removal and installation of seat belt
Removal and installation of machine monitor assembly
Removal and installation of engine controller assembly
Removal and installation of HSTcontroller assembly
Removal and installation of air conditioner controller assembly
Removal and installation of monitor controller assembly
Removal and installation of mass air flow and temperature sensor
Removal and installation of KOMTRAX terminal assembly
Air conditioner unit
Removal and installation of air conditioner compressor
Removal and installation of air conditioner condenser
Removal and installation of air conditioner unit assembly
Maintenance standard
Emergency steering valve
Steering cylinder
Brake accumulator charge valve
Slack adjuster
Brake
Parking brake
Parking brake solenoid valve
Axle mount
Center hinge pin
Hydraulic tank
Double type gear pump
Steering and work equipment pump
Control valve
Self-pressure reducing valve
Work equipment PPC valve
Work equipment lock solenoid valve4 topics
  • Work equipment cylinder
  • Bucket positioner
  • Fork positioner
  • Remote boom positioner
Appendix
Air conditioner components11 topics
  • Precautions for refrigerant
  • Air conditioner component
  • Configuration and function of refrigeration cycle
  • Outline of refrigeration cycle
  • Air conditioner unit
  • Dual pressure switch
  • Air conditioner controller
  • Compressor
  • Condenser
  • Receiver drier
  • Sunlight sensor

Inside this manual

Real pages from this service manual (2,060 pages). Open the sample pages (PDF, 973 KB)

Sample pages from the Komatsu WA270-7 with 6D107E-2 Engine Wheel Loader Service Manual: Specifications, Troubleshooting, Diagram, Foldout diagram
  • Specifications, page 85: 01 Specification
  • Troubleshooting, page 984: Failure code [CA3134] KDPF Outlet Press Sens Low Error
  • Diagram, page 1,418: Troubleshooting of electrical system (E-mode)
  • Foldout diagram: Electrical circuit diagram of floor (1/8)

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, 2,060 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.

Other editions and similar models

Komatsu WA270-7Operation & Maintenance Manual · CEAM028001 · $69.91Komatsu WA270-7Operation & Maintenance Manual · TEN00617-07 · $69.97Komatsu PC210LC-10 with 6D107E-2 EngineService Manual · CEBM026702 · $179.65Komatsu PC210LL-10 with 6D107E-2 EngineService Manual · CEBM029201 · $179.97Komatsu PC240LC-10 with 6D107E-2 EngineService Manual · CEBM024902 · $189.59Komatsu PC240LL-10 Log Loader with 6D107E-2 EngineService Manual · CEBM028501 · $189.69Komatsu PC290LC-10 with 6D107E-2 EngineService Manual · CEBM025104 · $169.97Komatsu WA320-7 with 6D107E-2 EngineService Manual · CEBM027701 · $209.87

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).