Komatsu HM400-2 Articulated Dump Truck Service Manual
1,495 pages · Publication CEBM007901
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- Models
- HM400-2
- Serial coverage
- A11001 and up
- Manual type
- Service Manual
- Pages
- 1,495
- Publication
- CEBM007901
- Condition
- Brand new

What's inside
From the manual's own table of contents: 221 sections, 456 entries. See sample pages (PDF, 857 KB)
Show all 221 sections
Brake42 topics
- Proportional reducing valve
- Brake system tank
- Parking brake
- Parking brake solenoid valve
- Suspension
- Suspension cylinder
- Oscillation hitch
- Steering, hoist oil pressure piping diagram
- Dump body control
- Hydraulic tank and filter
- Flow amp valve
- Steering valve
- Steering cylinder
- Hoist valve
- Dump control valve (EPC valve)
- Pilot check valve
- Hoist cylinder
- Hydraulic pump
- ROPS cab
- Cab tilt
- Air conditioner
- Rear view monitor
- Controller related
- Machine monitor system
- Automatic shift control system
- Transmission controller
- Retarder control system
- Auto emergency steering system
- Battery disconnector switch
- Dump control lever
- Payload meter (Card type)
- Sensors, switches
- KOMTRAX terminal system (if equipped)
- Standard value table for engine
- Standard value table for chassis
- Tools for testing, adjusting, and troubleshooting
- Measuring engine speed
- Testing intake air pressure (boost pressure)
- Testing exhaust temperature
- Testing exhaust gas color
- Adjusting valve clearance
- Testing compression pressure
Information in troubleshooting table54 topics
- Troubleshooting by failure code, Part 1
- Failure code [1500L0] Double engagement
- Failure code [15B0NX] Transmission oil filter: Clogged
- Failure code [15F0KM] R o F shifting abuse 1
- Failure code [15F0MB] R o F shifting abuse 2
- Failure code [15F7KM] Transmission forward clutch abuse
- Failure code [15G0MW] Trouble in reverse clutch system (Slip)
- Failure code [15G7KM] Transmission reverse clutch abuse
- Failure code [15H0MW] Trouble in Hi clutch system (Slip)
- Failure code [15J0MW] Trouble in Lo clutch system (Slip)
- Failure code [15K0MW] Trouble in 1st clutch system (Slip)
- Failure code [15L0MW] Trouble in 2nd clutch system (Slip)
- Failure code [15M0MW] Trouble in 3rd clutch system (Slip)
- Failure code [15SBL1] Trouble in reverse clutch pressure control valve
- Failure code [15SBMA] Trouble in reverse clutch pressure control valve
- Failure code [15SCL1] Trouble in Hi clutch pressure control valve
- Failure code [15SCMA] Trouble in Hi clutch pressure control valve
- Failure code [15SDL1] Trouble in Lo clutch pressure control valve
- Failure code [15SDMA] Trouble in Lo clutch pressure control valve
- Failure code [15SEL1] Trouble in 1st clutch pressure control valve
- Failure code [15SEMA] Trouble in 1st clutch pressure control valve
- Failure code [15SFL1] Trouble in 2nd clutch pressure control valve
- Failure code [15SFMA] Trouble in 2nd clutch pressure control valve
- Failure code [15SGL1] Trouble in 3rd clutch pressure control valve
- Failure code [15SGMA] Trouble in 3rd clutch pressure control valve
- Failure code [15SJMA] Trouble in lockup clutch pressure control valve
- Failure code [15SKMA] Trouble in interaxle differential lock clutch pressure control valve
- Failure code [2A62L1] Trouble in front wheel differential lock pressure control valve 2
- Failure code [2A62LH] Trouble in front wheel differential lock pressure control valve 1
- Failure code [2B62L1] Trouble in rear wheel differential lock pressure control valve 2
- Failure code [2B62LH] Trouble in rear wheel differential lock pressure control valve 1
- Failure code [2C4MNX] Clogging of retarder cooling oil filter
- Failure code [2F00KM] Dragging of parking brake
- Failure code [2G42ZG] Lowering of accumulator oil pressure (front)
- Failure code [2G43ZG] Lowering of accumulator oil pressure (rear)
- Failure code [989A00] Operation of engine overrun prevention system
- Failure code [989D00] Rear section tipping over alarm (Raising operation on slope)
- Failure code [A570NX] Clogging of engine oil filter
- Failure code [AA10NX] Clogging of air cleaner
- Failure code [AB00MA] Trouble in battery charge circuit
- Failure code [B@BAZG] Lowering of engine oil pressure
- Failure code [B@BAZK] Lowering of engine oil level
- Failure code [B@BCNS] Overheating of engine
- Failure code [B@BCZK] Lowering of coolant level
- Failure code [B@BFZK] Lowering of fuel level
- Failure code [B@C6NS] Overheating of brake cooling oil (front)
- Failure code [B@C7NS] Overheating of brake cooling oil (rear)
- Failure code [B@C8NS] Overheating of brake cooling oil (center)
- Failure code [B@CENS] Overheating of torque converter oil
- Failure code [B@JANS] Overheating of steering oil
- Failure code [CA111] Trouble in engine controller
- Failure code [CA115] Trouble in engine Ne and Bkup speed sensors
- Failure code [CA122] Abnormally high charge pressure
- Failure code [CA123] Abnormally low charge pressure
Failure code [CA2186] Abnormally low voltage in throttle sensor power supply53 topics
- Failure code [CA2249] Low pressure in supply pump 2
- Failure code [CA2271] Abnormally high signal voltage in EGR valve lift sensor
- Failure code [CA2272] Abnormally low signal voltage in EGR valve lift sensor
- Failure code [CA2351] Short circuit in EGR valve solenoid drive circuit
- Failure code [CA2352] Disconnection in EGR valve solenoid drive circuit
- Failure code [CA2555] Disconnection in intake air heater relay
- Failure code [CA2556] Short circuit in intake air heater relay
- Failure code [DAF9KM] Wrong connection of connector
- Failure code [DAFRKR] Trouble in CAN communication (machine monitor)
- Failure code [DAQ0KK] Lowering of source voltage
- Failure code [DAQ0KT] Trouble in non-volatile memory
- Failure code [DAQ2KK] Trouble in solenoid power supply system
- Failure code [DAQ9KQ] Disagreement of model selection (Transmission controller)
- Failure code [DAQRKR] Trouble in CAN communication (Transmission controller)
- Failure code [DAQRMA] Disagreement of option setting (Transmission controller)
- Failure code [DB10KT] Trouble in non-volatile memory
- Failure code [DB12KK] Trouble in solenoid power supply system
- Failure code [DB13KK] Lowering of battery direct voltage
- Failure code [DB19KQ] Disagreement of model selection (Retarder controller)
- Failure code [DB1QMA] Disagreement of option setting (Retarder controller)
- Failure code [DB1RKR] Trouble in CAN communication (Retarder controller)
- Failure code [DB2RKR] Trouble in CAN communication (Engine controller)
- Failure code [DD1ML4] Disagreement of accelerator-linked retarder switch signal
- Failure code [DDTHKA] Trouble in Hi clutch flow sensor valve
- Failure code [DDTJKA] Trouble in Lo clutch flow sensor valve
- Failure code [DDTKKA] Trouble in 1st clutch flow sensor valve
- Failure code [DDTLKA] Trouble in 2nd clutch flow sensor valve
- Failure code [DDTMKA] Trouble in 3rd clutch flow sensor valve
- Failure code [DDTNKA] Trouble in reverse clutch flow sensor valve
- Failure code [DF10KA] Input of no lever signals
- Failure code [DF10KB] Input of multiple lever signals
- Failure code [DGF1KX] Transmission oil temperature out of range
- Failure code [DGR2KZ] Ground fault in brake oil temperature sensor (rear)
- Failure code [DGR2L8] Disconnection in brake oil temperature sensor (rear)
- Failure code [DGR3KZ] Ground fault in brake oil temperature sensor (center)
- Failure code [DGR3L8] Disconnection in brake oil temperature sensor (center)
- Failure code [DGR4KZ] Ground fault in brake oil temperature sensor (front)
- Failure code [DGR4L8] Disconnection in brake oil temperature sensor (front)
- Failure code [DGR6KX] Steering oil temperature out of range
- Failure code [DGT1KX] Short circuit in torque converter oil temperature sensor system
- pressure sensor system
- Failure code [DHT5L6] Trouble in torque converter oil pressure sensor
- Failure code [DHU2KX] Trouble in accumulator oil pressure sensor (front) system
- Failure code [DHU3KX] Trouble in accumulator oil pressure sensor (rear) system
- Failure code [DJF1KA] Disconnection in fuel level sensor system
- Failure code [DK51L5] Trouble in manual retarder potentiometer and RVS
- Failure code [DK52KX] Trouble in dump lever potentiometer 1
- Failure code [DK53L8] Trouble in dump lever potentiometer 2
- Failure code [DK54KX] Trouble in dump positioner sensor
- Failure code [DKH0KX] Pitch angle sensor signal out of range
- Failure code [DLF1KA] Disconnection in transmission input shaft speed sensor system
- Failure code [DLF1LC] Trouble in transmission input shaft speed sensor
- system
Failure code [DX15KZ] Trouble in front wheel differential lock command output system1 topic
- solenoid
Failure code [DXH5KA] Disconnection in output circuit of 2nd clutch solenoid51 topics
- Failure code [DXH5KB] Ground fault in output circuit of 2nd clutch ECMV solenoid valve
- Failure code [DXH5KY] Hot short in output circuit of 2nd clutch ECMV solenoid valve
- Failure code [DXH6KA] Disconnection in output circuit of 3rd clutch solenoid
- Failure code [DXH6KB] Ground fault in output circuit of 3rd clutch ECMV solenoid valve
- Failure code [DXH6KY] Hot short in output circuit of 3rd clutch ECMV solenoid valve
- Failure code [DXH7KA] Disconnection in output circuit of reverse clutch solenoid
- Failure code [DXH7KB] Ground fault in output circuit of reverse clutch ECMV solenoid valve
- Failure code [DXH7KY] Hot short in output circuit of reverse clutch ECMV solenoid valve
- Before troubleshooting for electrical system
- Information in troubleshooting table
- Engine does not start (Starting motor does not turn)
- Auto preheater does not operate
- When starting switch is turned ON, machine monitor displays nothing
- When starting switch is turned OFF, machine monitor cannot be operated
- Alarm buzzer does not stop sounding
- display section
- Display of character display section cannot be changed
- Power mode selection function does not operate normally
- AISS function does not operate normally
- (Differential lock-up specification)
- Interaxle differential lock-up function does not operate normally
- Display of seat belt caution lamp is abnormal
- Turn signal lamps and pilot lamps do not operate normally
- Night lighting is abnormal
- Backup lamp and backup buzzer operate abnormally
- Emergency steering system does not operate
- Troubleshooting of hydraulic and mechanical system (H-mode)
- Machine does not start
- Travel is not smooth (Machine hunts)
- Lockup is not reset
- Start shock and gear shift shock are abnormally large
- Gear is not shifted up
- Travel speed or power is low
- Start and gearshift time lag is large
- Torque converter oil temperature is high
- Torque converter oil temperature is low
- Front brake does not work fully
- Center brake does not work fully
- Rear brake does not work fully
- Steering wheel is heavy
- Steering wheel does not move
- Steering wheel waggle
- Dump body raising speed is low
- Dump body does not move
- Hydraulic drift of dump body is large
- Method of using troubleshooting chart
- Starting performance of engine is poor
- Engine does not start
- Engine does not pick up smoothly
- Engine stops during operation
- Engine does not rotate smoothly
Removal and installation of rear front wheel assembly34 topics
- Removal and installation of rear rear wheel assembly
- Removal and installation of hitch frame assembly
- Disassembly and assembly of hitch frame
- Removal and installation of body assembly
- Disassembly and assembly of steering valve
- Removal and installation of flow amplifier valve assembly
- Removal and installation of hoist valve assembly
- Disassembly and assembly of hoist valve assembly
- Disassembly and assembly of steering cylinder assembly
- Disassembly and assembly of hoist cylinder assembly
- Removal and installation of operator's cab
- Removal and installation of operator's cab glass (Stuck glass)
- Disassembly and assembly of operator’s seat assembly
- Removal and installation of air conditioner unit assembly
- Removal and installation of retarder controller assembly
- Removal and installation of transmission controller assembly
- Removal and installation of engine controller assembly
- Steering and hoist hydraulic circuit diagram (Serial No.: Previous Design)
- Steering and hoist hydraulic circuit diagram (Serial No.: New Design)
- Brake hydraulic circuit diagram
- Brake cooling hydraulic circuit diagram
- Differential lock hydraulic circuit diagram
- Power train hydraulic circuit diagram
- Electrical circuit diagram for inside cab (1/4)
- Electrical circuit diagram for inside cab (2/4) (Serial No.: Previous Design)
- Electrical circuit diagram for inside cab (2/4) (Serial No.: New Design)
- Electrical circuit diagram for inside cab (3/4) (Serial No.: Previous Design)
- Electrical circuit diagram for inside cab (3/4) (Serial No.: New Design)
- Electrical circuit diagram for inside cab (4/4)
- Electrical circuit diagram for outside cab (1/3)
- Electrical circuit diagram for outside cab (2/3)
- Electrical circuit diagram for outside cab (3/3)
- Electrical circuit diagram for payload meter
- Connectors table and arrangement drawing
Inside this manual
Real pages from this service manual (1,495 pages). Open the sample pages (PDF, 856 KB)
- Specifications, page 62: 01 Specification
- Troubleshooting, page 775: Failure code [CA731] Phase error in engine Bkup speed sensor
- Diagram, page 844: Failure code [DDTLKA] Trouble in 2nd clutch flow sensor valve
- Foldout diagram, page 1,479: Electrical circuit diagram for inside cab (2/4) Serial No.: New Design
Other manuals for this machine
Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the HM400-2 are listed below. Editions cover different serial number ranges: check the serial coverage and tick only the ones that match your machine.
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This is a service manual
Here's how it compares to the other manual types.
Service manual
Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.
Operator's manual
Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.
Parts manual
Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.
Engine service manuals are sometimes sold separately, since certain machine models were offered with more than one engine option.
What it's used for
Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.
Service shops and owner/operators who repair their own equipment
Identifying correct parts and seeing how assemblies come apart and go back together
Keeping equipment running with less downtime
Factory manual, 1,495 pages
Quantity one is the manual described above.
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Other editions and similar models
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