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Komatsu D155AX-7 Bulldozer Service Manual

2,108 pages · Publication SEN05653-03

$219.69
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Models
D155AX-7
Serial coverage
90001 and up
Manual type
Service Manual
Pages
2,108
Publication
SEN05653-03
Condition
Brand new
Komatsu D155AX-7 Bulldozer Service Manual, publication SEN05653-03

What's inside

From the manual's own table of contents: 372 sections, 700 entries. See sample pages (PDF, 796 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
Specification
Weight table
Table of fuel, coolant, and lubricants
Structure and function
Engine and cooling system
Show all 372 sections
Engine related parts
KVGT
EGR system piping drawing
EGR system circuit diagram
EGR valve
EGR cooler
KCCV layout drawing
KCCV ventilator
KDPF
Damper
Cooling system
Cooling fan pump
Cooling fan motor
Power train
Power train system
HSS system
Overall drawing of power train unit
Power train mount
Layout of power train hydraulic piping
Transmission, steering, and brake control
Universal joint
Torque converter and PTO
Torque converter control valve
Lockup clutch ECMV
Stator clutch ECMV
Transmission
Transmission ECMV
Main relief valve and torque converter relief valve
Transmission lubrication relief valve
Bevel gear shaft, HSS, and brake
Brake control valve4 topics
  • Brake ECMV
  • Brake solenoid valve
  • Sudden stop prevention valve
  • Final drive
Undercarriage and frame3 topics
  • Main frame
  • Suspension
  • Track frame and idler cushion
Hydraulic system14 topics
  • Hydraulic component layout
  • Work equipment control
  • Hydraulic tank
  • CLSS
  • Scavenging pump
  • Steering lubrication pump and power train pump
  • Work equipment and HSS pump
  • HSS motor
  • Control valve
  • Quick drop valve
  • Work equipment lock solenoid valve
  • Hydraulic oil cooler bypass valve
  • Accumulator
  • Self-pressure reducing valve
Work equipment4 topics
  • Cylinder stay
  • Blade
  • Ripper
  • Piston valve
Cab and its attachments3 topics
  • ROPS cab
  • Function
  • Cab mount
Electrical system9 topics
  • Engine control
  • Engine control system
  • Palm command control system
  • System operating lamp function
  • Battery disconnect switch function
  • Machine 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 adjusting7 topics
  • 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
  • Adjusting valve clearance
Measuring compression pressure
Testing blowby pressure
Testing engine oil pressure
Testing EGR valve and KVGT driving oil pressure
Measuring 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
Replacing belt for alternator and air conditioner compressor, adjusting belt tension
Adjusting fuel control dial and decelerator pedal
Procedures for cleaning fuel doser
Writing compensation values at replacement of injector and engine controller
Testing power train oil pressure
Adjusting transmission output shaft speed sensor (replacement procedure)
Simple test procedure for brake performance
Adjusting brake pedal
Adjusting parking brake lever
Retrieval of disabled machine by using brake release device
Adjusting idler clearance
Testing and adjusting track tension
Releasing remaining pressure in work equipment cylinder
Testing and adjusting work equipment and HSS oil pressures
Bleeding air from work equipment and HSS pump
Testing source pressure of control circuit
Testing work equipment lock solenoid valve output pressure
Isolating the parts causing hydraulic drift in blade and ripper
Checking fan speed
Testing fan circuit oil pressure
Bleeding air from fan pump
Testing internal oil leakage of work equipment cylinder
Bleeding air from work equipment cylinders
Emergency operating method when work equipment has trouble
Testing ripper pin puller solenoid valve output pressure
Adjusting work equipment lock lever
Adjusting blade
Adjusting operator's cab
Special functions of machine monitor
Angle adjustment of rear view camera
Handling voltage circuit of engine controller
Handling battery disconnect switch
Testing diodes
Pm clinic
Pm Clinic service
Check sheet
Troubleshooting
Related information on troubleshooting
Troubleshooting points
Sequence of events in troubleshooting
Checks before troubleshooting
Inspection procedure before troubleshooting10 topics
  • Preparation 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
  • Failure codes table
Troubleshooting by failure code (Display of code)44 topics
  • Failure code [1500L0] Transmission clutch: Abnormal
  • Failure code [15SAL1] Forward clutch: Fill High
  • Failure code [15SALH] Forward clutch: Fill Low
  • Failure code [15SBL1] Reverse clutch: Fill High
  • Failure code [15SBLH] Reverse clutch: Fill Low
  • Failure code [15SEL1] Speed 1st clutch: Fill High
  • Failure code [15SELH] Speed 1st clutch: Fill Low
  • Failure code [15SFL1] Speed 2nd clutch: Fill High
  • Failure code [15SFLH] Speed 2nd clutch: Fill Low
  • Failure code [15SGL1] Speed 3rd clutch: Fill High
  • Failure code [15SGLH] Speed 3rd clutch: Fill Low
  • Failure code [15SJL1] L/U: Fill High
  • Failure code [15SJLH] L/U: Fill Low
  • Failure code [1800MW] P/Tclutch:Slip
  • Failure code [2300NR] Brake Thermal Load Abnormality
  • Failure code [2301L1] Right brake: Fill High
  • Failure code [2301LH] Right brake: Fill low
  • Failure code [2302L1] Left brake: Fill High
  • Failure code [2302LH] Left brake: Fill low
  • 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 [879GKX] Refrigerant 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 [AA10NX] Air Cleaner Clogging
  • Failure code [AB00KE] Charge Voltage Low
  • 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@CENS] P/L Oil Overheat
  • Failure code [B@HANS] Hyd Oil 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 Sens High Error
Failure code [CA222] Ambient Press Sens 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 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 [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 2
Failure code [CA556] Crankcase Press High Error 3
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 Error59 topics
  • 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 [D130KA] Neutral relay:Open
Failure code [D130KB] Neutral relay:Short circuit
Failure code [D190KA] ECM ACC signal HOLD relay: Open
Failure code [D190KB] ECM ACC signal HOLD relay: Short circuit
Failure code [D19JKZ] Personal Code Relay Abnormality
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 [D8AQKR] CAN2 Discon (KOMTRAX)
Failure code [DAF0MB] Monitor ROM Abnormality
Failure code [DAF0MC] Monitor Error
Failure code [DAF8KB] Camera Power Supply Short Circuit
Failure code [DAF9KQ] Model Selection Abnormality
Failure code [DAFGMC] GPS Module Error
Failure code [DAFLKA] Operating Lamp Open Circuit (Mon)
Failure code [DAFLKB] Operating Lamp Short Circuit (Monitor)
Failure code [DAFQKR] CAN2 Discon (Monitor)
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 [DB90KT] WE controller: Abnormality in controller
Failure code [DB90MC] WE Con Error
Failure code [DB91KK] WE controller:Source voltage low
Failure code [DB92KK] WE controller: Output voltage low
Failure code [DB95KK] WE:Sensor volt 5V (0) Out of normal range
Failure code [DB97KK] WE: Sensor volt 5V (1) Out of normal range
Failure code [DB99KQ] WE controller: Type select signal
Failure code [DB9LKA] Operating Lamp Open Circuit (WE Con)
Failure code [DB9LKB] Operating Lamp Short Circuit (WE Con)
Failure code [DB9QKR] CAN2 Discon (WE Con)
Failure code [DB9RKR] CAN1 Discon (WE Con)
Failure code [DBE0KT] PTcontroller: Abnormality in controller
Failure code [DBE1KK] PTcontroller:Source voltage low
Failure code [DBE2KK] PTcontroller: Output voltage low
Failure code [DBE5KK] PT:Sensor volt 5V (0) Out of normal range
Failure code [DBE6KK] PT: Sensor volt 24 V Out of normal range
Failure code [DBE9KQ] PT controller: Type select signal
Failure code [DBELKA] Operating Lamp Open Circuit (PT Con)
Failure code [DBELKB] Operating Lamp Short Circuit (PT Con)
Failure code [DBEQKR] CAN2 Discon (PT Con)
Failure code [DBERKR] CAN1 Discon (PT Con)
Failure code [DD12KA] Shift up Sw: Open
Failure code [DD12KB] Shift up SW: Short Circuit
Failure code [DD13KA] Shift down SW: Open
Failure code [DD13KB] Shift down SW: Short Circuit
Failure code [DD14KA] Parking lever SW: Open
Failure code [DD14KB] Parking lever SW: Short circuit
Failure code [DDDDKA] Brake pedal SW: Open
Failure code [DDDDKB] Brake pedal SW: Short circuit
Failure code [DDDDKX] Brake pedal Sw: Mismatch
Failure code [DDKAKA] Blade float Sw:Open
Failure code [DDKAKB] Blade float Sw:Short circuit
Failure code [DDKBKA] Blade auto pitch Sw:Open
Failure code [DDKBKB] Blade auto pitch Sw:Short circuit
Failure code [DDKCL4] Ripper tilt in Sw:Signal mismatch
Failure code [DDKEL4] Ripper tilt back Sw:Signal mismatch59 topics
  • Failure code [DDN7L4] Blade pitch back Sw:Signal mismatch
  • Failure code [DDN8L4] Blade pitch dump Sw:Signal mismatch
  • Failure code [DDNLKA] Weq lock Sw:Open
  • Failure code [DDNLKB] Weq lock Sw:Short circuit
  • Failure code [DDTSL1] S/C :Fill High
  • Failure code [DDTSLH] S/C :Fill Low
  • Failure code [DFA4KX] Blade lift lever:Main and Sub Error
  • Failure code [DFA4KZ] Blade lift lever:Main and Sub Error
  • Failure code [DFA4L8] Blade lift lever:Signal mismatch
  • Failure code [DFA5KA] Blade lift lever1:Open
  • Failure code [DFA5KB] Blade lift lever1:Hot Short
  • Failure code [DFA6KA] Blade lift lever2:Open
  • Failure code [DFA6KB] Blade lift lever2:Hot Short
  • Failure code [DFA7KX] Blade tilt lever:Main and Sub Error
  • Failure code [DFA7KZ] Blade tilt lever:Main and Sub Error
  • Failure code [DFA7L8] Blade tilt lever:Signal mismatch
  • Failure code [DFA8KA] Blade tilt lever1:Open
  • Failure code [DFA8KB] Blade tilt lever1:Hot Short
  • Failure code [DFA9KA] Blade tilt lever2:Open
  • Failure code [DFA9KB] Blade tilt lever2:Hot Short
  • Failure code [DFAAKX] Ripper lift lever:Main and Sub Error
  • Failure code [DFAAKZ] Ripper lift lever:Main and Sub Error
  • Failure code [DFAAL8] Ripper lift lever:Signal mismatch
  • Failure code [DFABKA] Ripper lift lever1:Open
  • Failure code [DFABKB] Ripper lift lever1:Hot Short
  • Failure code [DFACKA] Ripper lift lever2:Open
  • Failure code [DFACKB] Ripper lift lever2:Hot Short
  • Failure code [DGS1KA] Hyd oil temp sensor:Open
  • Failure code [DGS1KX] Hyd oil temp:Out of normal range
  • Failure code [DGT1KA] T/C oil temp sensor:Open
  • Failure code [DGT1KX] T/C oil temp sensor:Out of normal range
  • Failure code [DH21KA] Weq pressure sensor:Open
  • Failure code [DH21KB] Weq pressure sensor:Hot Short
  • Failure code [DHA4KA] Air Cleaner Clog Sensor Open Circuit
  • Failure code [DHT5KA] T/C in-pressure sensor:Open
  • Failure code [DHT5KB] T/C in-pressure sensor:Hot Short
  • Failure code [DHT7KA] T/C out-pressure sensor:Open
  • Failure code [DHT7KB] T/C out-pressure sensor:Hot Short
  • Failure code [DK10KA] Fuel control Dial:Open
  • Failure code [DK10KB] Fuel control Dial:Short circuit
  • Failure code [DK30KA] ST lever1:Open
  • Failure code [DK30KB] ST lever1:Hot Short
  • Failure code [DK30KX] ST lever:Main and Sub Error
  • Failure code [DK30KZ] ST lever:Main and Sub Error
  • Failure code [DK30L8] ST lever:Signal mismatch
  • Failure code [DK31KA] ST lever2:Open
  • Failure code [DK31KB] ST lever2:Hot Short
  • Failure code [DK40KA] Brake potentiometer:Open
  • Failure code [DK40KB] Brake potentiometer:Hot Short
  • Failure code [DK55KX] FR lever:Main and Sub Error
  • Failure code [DK55KZ] FR lever:Main and Sub Error
  • Failure code [DK55L8] FR lever:Signal mismatch
  • Failure code [DK56KA] FR lever1:Open
  • Failure code [DK56KB] FR lever1:Hot Short
  • Failure code [DK57KA] FR lever2:Open
  • Failure code [DK57KB] FR lever2:Hot Short
  • Failure code [DKH1KA] Pitch angle sensor:Open
  • Failure code [DKH1KB] Pitch angle sensor:Hot Short
  • Failure code [DLM3KA] Fan rev. sensor:Open
Failure code [DLM3MB] Fan control:Mismatch
Failure code [DLT3KA] T/M out-speed sensor:Open
Failure code [DLT3KB] T/M out-speed sensor:Short circuit
Failure code [DR21KX] Camera 2 Picture Rev. Drive Abnormality
Failure code [DR31KX] Camera 3 Picture Rev. Drive Abnormality
Failure code [DV20KB] Back-up alarm :Short circuit
Failure code [DW7BKA] Fan Reverse Solenoid Open Circuit
Failure code [DW7BKB] Fan Reverse Solenoid Short Circuit
Failure code [DWN1KA] Hss EPC RH:Open
Failure code [DWN1KB] Hss EPC RH:Short circuit
Failure code [DWN1KY] Hss EPC RH:Hot short
Failure code [DWN2KA] Hss EPC LH:Open
Failure code [DWN2KB] Hss EPC LH:Short circuit
Failure code [DWN2KY] Hss EPC LH:Hot short
Failure code [DWN3KA] S.S.P.V. solenoid:Open
Failure code [DWN3KB] S.S.P.V. solenoid:Short circuit
Failure code [DWN3KY] S.S.P.V. solenoid:Hot short
Failure code [DWN5KA] Fan pump solenoid 1:Open
Failure code [DWN5KB] Fan pump solenoid 1:Short circuit
Failure code [DWN5KY] Fan pump solenoid 1:Hot Short
Failure code [DXA2KA] TVC solenoid 1:Open
Failure code [DXA2KB] TVC solenoid 1:Short circuit
Failure code [DXA2KY] TVC solenoid 1:Hot short
Failure code [DXH1KA] Lock-up ECMV:Open
Failure code [DXH1KB] Lock-up ECMV:Short circuit
Failure code [DXH1KY] Lock-up ECMV:Hot short
Failure code [DXH4KA] 1st clutch ECMV:Open
Failure code [DXH4KB] 1st clutch ECMV:Short circuit
Failure code [DXH4KY] 1st clutch ECMV:Hot short
Failure code [DXH5KA] 2nd clutch ECMV:Open
Failure code [DXH5KB] 2nd clutch ECMV:Short circuit
Failure code [DXH5KY] 2nd clutch ECMV:Hot short
Failure code [DXH6KA] 3rd clutch ECMV:Open
Failure code [DXH6KB] 3rd clutch ECMV:Short circuit
Failure code [DXH6KY] 3rd clutch ECMV:Hot short
Failure code [DXH7KA] R clutch ECMV:Open
Failure code [DXH7KB] R clutch ECMV:Short circuit
Failure code [DXH7KY] R clutch ECMV:Hot short
Failure code [DXH8KA] F clutch ECMV:Open
Failure code [DXH8KB] F clutch ECMV:Short circuit
Failure code [DXH8KY] F clutch ECMV:Hot short
Failure code [DXHBKA] Right brake ECMV:Open
Failure code [DXHBKB] Right brake ECMV:Short circuit
Failure code [DXHBKY] Right brake ECMV:Hot short
Failure code [DXHCKA] Left brake ECMV:Open
Failure code [DXHCKB] Left brake ECMV:Short circuit
Failure code [DXHCKY] Left brake ECMV:Hot short
Failure code [DXHRKA] Blade lift up EPC:Open
Failure code [DXHRKB] Blade lift up EPC:Short circuit
Failure code [DXHRKY] Blade lift up EPC:Hot short
Failure code [DXHSKA] Blade lift down EPC:Open
Failure code [DXHSKB] Blade lift down EPC:Short circuit
Failure code [DXHSKY] Blade lift down EPC:Hot short
Failure code [DXHTKA] Blade tilt right head EPC:Open
Failure code [DXHTKB] Blade tilt right head EPC:Short circuit
Failure code [DXHTKY] Blade tilt right head EPC:Hot short
Failure code [DXHUKA] Blade tilt right bottom EPC:Open
Failure code [DXHUKB] Blade tilt right bottom EPC:Short circuit
Failure code [DXHUKY] Blade tilt right bottom EPC:Hot short26 topics
  • Failure code [DXHWKA] Ripper lift up EPC:Open
  • Failure code [DXHWKB] Ripper lift up EPC:Short circuit
  • Failure code [DXHWKY] Ripper lift up EPC:Hot short
  • Failure code [DXHXKA] Ripper lift down EPC:Open
  • Failure code [DXHXKB] Ripper lift down EPC:Short circuit
  • Failure code [DXHXKY] Ripper lift down EPC:Hot short
  • Failure code [DXHYKA] Ripper tilt in EPC:Open
  • Failure code [DXHYKB] Ripper tilt in EPC:Short circuit
  • Failure code [DXHYKY] Ripper tilt in EPC:Hot short
  • Failure code [DXHZKA] Ripper tilt back EPC:Open
  • Failure code [DXHZKB] Ripper tilt back EPC:Short circuit
  • Failure code [DXHZKY] Ripper tilt back EPC:Hot short
  • Failure code [DXJ4KA] Weq lock Sol.:Open
  • Failure code [DXJ4KB] Weq lock Sol.:Short circuit
  • Failure code [DXJ8KA] Blade tilt left bottom EPC:Open
  • Failure code [DXJ8KB] Blade tilt left bottom EPC:Short circuit
  • Failure code [DXJ8KY] Blade tilt left bottom EPC:Hot
  • Failure code [DXJ9KA] Blade tilt left head EPC:Open
  • Failure code [DXJ9KB] Blade tilt left head EPC:Short circuit
  • Failure code [DXJ9KY] Blade tilt left head EPC:Hot short
  • Failure code [DXJAKA] Quick drop solenoid:Open
  • Failure code [DXJAKB] Quick drop solenoid:Short circuit
  • Failure code [DXJAKY] Quick drop solenoid:Hot short
  • Failure code [DXJBKA] T/C Stator ECMV:Open
  • Failure code [DXJBKB] T/C Stator ECMV:Short circuit
  • Failure code [DXJBKY] T/C Stator ECMV:Hot short
Troubleshooting of electrical system (E-mode)30 topics
  • Engine does not start (Engine does not crank)
  • Manual preheating system does not work
  • Automatic preheating system does not work
  • While preheating is working, preheating monitor does not light up
  • When starting switch is turned to ON position, machine monitor displays nothing
  • Air cleaner clogging monitor lights up in yellow while engine is running
  • Charge level monitor lights up in red while engine is running
  • Engine coolant temperature monitor lights up in red while engine is running
  • Engine oil pressure monitor lights up in red while engine is running
  • Power train oil temperature monitor lights up in red while engine is running
  • Hydraulic oil temperature monitor lights up in red while engine is running
  • Engine coolant temperature gauge does not indicate correct temparature
  • Fuel level gauge does not indicate correct level
  • Power train oil temperature gauge does not indicate correct temperature
  • Hydraulic oil temperature gauge does not indicate correct temperature
  • Operation mode does not change
  • Gear shift mode does not change
  • Operating customize switch does not display customize screen
  • Modifying setting on customize screen does not change setting of machine
  • Some areas of machine monitor screen are not displayed
  • Alarm buzzer does not sound or does not stop sounding
  • While starting switch is in OFF position, service meter is not displayed
  • Service mode cannot be selected
  • Horn does not sound
  • Horn does not stop sounding
  • Backup alarm does not sound
  • Backup alarm does not stop sounding
  • Headlamp does not light up
  • Rear lamp and ripper point lamp do not light up
  • No wiper operates continuously or intermittently
Front wiper does not operate (failed continuous and intermittent operations)
Rear wiper does not operate (failed continuous and intermittent operations)
Left door wiper does not operate (failed continuous and intermittent operations)
Front washer does not operate
Rear washer does not operate
Left door washer does not operate
Right door washer does not operate
Ripper pin puller does not work
Fan does not rotate in reverse
Fuel feed pump does not operate or stop automatically
Gear cannot be shifted
KOMTRAX system does not operate properly
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 lacks power (insufficient drawbar pull)
Machine does not travel (at 2nd or 3rd gear speed)
Machine does not start at all gear speeds
Machine travels only in one direction, either forward or in reverse
Large time lag is in gear shifting or directional change
Machine cannot be steered (machine does not turn left or right)
Steering speed or power is insufficient
Brake does not work
Torque converter lockup clutch does not engage
Power train oil overheats
Unusual noise is heard from around HSS pump or HSS motor
All work equipment operates slowly
All work equipment do not operate
Blade lift speed or power is low
Blade tilt speed or power is low
Ripper lift speed or power is low
Ripper tilt speed or power is low
Hydraulic drift of lifted blade is large
Hydraulic drift of tilted blade is large
Hydraulic drift of lifted ripper is large
Ripper pin puller cylinder does not operate
Blade pitch cylinder does not operate
Unusual noise is heard from around work equipment pump
Fan speed is abnormal (too high or low, or stationary)
Unusual noise is heard from around fan
Troubleshooting of engine (S-mode)
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)10 topics
  • 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
Related information on disassembly and assembly43 topics
  • How to read this manual
  • Coating materials list
  • Special tools list
  • Sketches of special tools
  • 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 air cleaner assembly
  • Removal and installation of KDPF assembly
  • Disassembly and assembly of KDPF assembly
  • Removal and installation of KCCV assembly
  • Removal and installation of engine assembly
  • Removal and installation of engine front seal
  • Removal and installation of engine rear seal
  • Removal and installation of radiator assembly
  • Removal and installation of aftercooler assembly
  • Removal and installation of hydraulic oil cooler assembly
  • Removal and installation of cooling fan drive assembly
  • Removal and installation of cooling in fan motor assembly
  • Removal and installation of engine hood assembly
  • Removal and installation of fuel tank assembly
  • Removal and installation of damper assembly
  • Disassembly and assembly of damper assembly
  • Removal and installation of power train unit assembly
  • Disconnection and connection of power train unit assembly
  • Disassembly and assembly of PTO assembly
  • Disassembly and assembly of torque converter assembly
  • Disassembly and assembly of transmission assembly
  • Disassembly and assembly of HSS assembly
  • Removal and installation of HSS motor assembly
  • Removal and installation of final drive assembly
  • Disassembly and assembly of final drive
  • Removal and installation of track frame assembly
  • Removal and installation of idler assembly
  • Disassembly and assembly of idler assembly
  • Removal and installation of recoil spring assembly
  • Disassembly and assembly of recoil spring assembly
  • Removal and installation of track roller assembly
  • Disassembly and assembly of track roller assembly
  • Removal and installation of 1st bogie assembly
  • Removal and installation of 2nd, 3rd, or 4th bogie assembly
  • Disassembly and assembly of bogie assembly
  • Removal and installation of carrier roller assembly
Disassembly and assembly of carrier roller assembly
Removal and installation of pivot shaft assembly
Separation and connection of track shoe assembly
Overall disassembly and assembly of track shoe assembly
Field disassembly and assembly of one link
Disassembly and assembly of master link
Removal and installation of equalizer bar assembly
Disassembly and assembly of equalizer bar bushing
Removal and installation of segment teeth
Removal and installation of hydraulic tank assembly
Removal and installation of control valve assembly
Removal and installation of work equipment pump and HSS pump assembly
Removal and installation of cooling fan pump assembly
Removal and installation of scavenging pump assembly
Disassembly and assembly of hydraulic cylinder assembly
Removal and installation of blade assembly
Disassembly and assembly of blade assembly
Disassembly and assembly of multi-shank ripper assembly
Disassembly and assembly of giant ripper assembly
Removal and installation of operator's cab assembly

Inside this manual

Real pages from this service manual (2,108 pages). Open the sample pages (PDF, 795 KB)

Sample pages from the Komatsu D155AX-7 Bulldozer Service Manual: Troubleshooting, Diagram, Specifications, Foldout diagram
  • Troubleshooting, page 1,207: Failure code [DFA9KB] Blade tilt lever2:Hot Short
  • Diagram, page 1,335: Circuit diagram related to right brake ECMV solenoid
  • Specifications, page 1,495: Troubleshooting of hydraulic and mechanical system (H-
  • Foldout diagram: Electrical circuit diagram (4/13)

Other manuals for this machine

Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the D155AX-7 are listed below. Editions cover different serial number ranges: check the serial coverage and tick only the ones that match your machine.

This manual: Service Manual SEN05653-03$219.69
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Details

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, 2,108 pages

Quantity one is the manual described above.

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Binder not included

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