Komatsu WA380-6 Wheel Loader Service Manual
1,734 pages · Publication VEBM440102
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- Models
- WA380-6
- Serial coverage
- H60051 and up
- Manual type
- Service Manual
- Pages
- 1,734
- Publication
- VEBM440102
- Condition
- Brand new

What's inside
From the manual's own table of contents: 291 sections, 509 entries. See sample pages (PDF, 799 KB)
Show all 291 sections
Emergency steering pump47 topics
- Joystick steering lever linkage
- Steering electric lever
- Joystick EPC valve
- Brake piping diagram
- Charge valve
- Brake valve
- Accumulator (for brake)
- Brake
- Parking brake control
- Parking brake
- Parking brake solenoid valve
- Emergency parking brake release valve
- Axle mount and center hinge pin
- Tires
- Hydraulic piping diagram
- Work equipment control lever linkage
- Hydraulic tank
- Power train pump
- Work equipment pump
- Work equipment control valve
- CLSS
- Each function and operation of each valve
- PPC valve
- Stabilizer valve
- Accumulator (for PPC circuit)
- Accumulator (for ECSS)
- Work equipment PPC cut-off solenoid valve
- Work equipment linkage
- Bucket
- Bucket positioner and boom kick-out
- Work equipment cylinder
- Air conditioner
- Machine monitor system
- Machine monitor
- Electrical system (Transmission controller system)
- Transmission controller
- Electrical system (Work equipment controller system)
- Work equipment controller
- Electric transmission control
- Kickdown switch and hold switch
- Load meter cancel switch and load meter subtotal switch
- Multi-function knob
- Joystick steering knob
- KOMTRAX terminal system
- Engine starting circuit
- Engine stopping circuit
- Preheating circuit
Releasing residual pressure in brake accumulator circuit46 topics
- Testing parking brake performance
- Testing parking brake oil pressure
- Testing wear of parking brake disc
- Method of releasing parking brake manually
- Testing and adjusting work equipment control lever
- Testing and adjusting work equipment PPC oil pressure
- Testing and adjusting work equipment oil pressure
- Bleeding air from work equipment circuit
- Releasing residual pressure in work equipment circuit
- (Electronically Controlled Suspension System) accumulator
- Testing and adjusting bucket positioner
- Testing and adjusting boom kick-out
- Checking proximity switch operation pilot lamp
- Procedure for testing diodes
- Preparation work for troubleshooting for electric system
- How to start operation of KOMTRAX terminal
- Lamp display of KOMTRAX terminal
- Adjusting replaced, reassembled or added sensor, controller, etc. with machine monitor
- Special functions of machine monitor (EMMS)
- Pm-clinic inspection table
- Failure code table
- Fuse locations
- Points to remember when troubleshooting
- Sequence of events in troubleshooting
- Testing before troubleshooting
- Classification and procedures of troubleshooting
- Information contained in troubleshooting table
- Connection table for connector pin numbers
- T- branch box and T- branch adapter table
- Failure code [1500L0] (TORQFLOW transmission: Double meshing)
- Failure code [15SAL1] (ECMV F clutch: When command current is OFF, fill signal is ON)
- Failure code [15SALH] (ECMV F clutch: When command current is ON, fill signal is OFF)
- Failure code [15SBL1] (ECMV R clutch: When command current is OFF, fill signal is ON)
- Failure code [15SBLH] (ECMV R clutch: When command current is ON, fill signal is OFF)
- Failure code [15SEL1] (ECMV 1st clutch: When command current is OFF, fill signal is ON)
- Failure code [15SELH] (ECMV 1st clutch: When command current is ON, fill signal is OFF)
- Failure code [15SFL1] (ECMV 2nd clutch: When command current is OFF, fill signal is ON)
- Failure code [15SGL1] (ECMV 3rd clutch: When command current is OFF, fill signal is ON)
- Failure code [15SHL1] (ECMV 4th clutch: When command current is OFF, fill signal is ON)
- Failure code [2F00MA] (Parking brake: Malfunction)
- Failure code [2G43ZG] (Accumulator: Low oil pressure)
- Failure code [44K0L4] (Bucket positioner: ON/OFF signals disagree)
- Failure code [AA1ANX] (Air cleaner: Clogging)
- Failure code [AB00L6] (Alternator: Signal disagrees with operating state of engine)
- Failure code [AB00MA] (Alternator: Malfunction)
- Failure code [B@BAZG] (Rotation derating by low engine oil pressure)
Failure code [CA2186] (Throttle sensor power supply voltage low error)30 topics
- Failure code [CA2249] (Supply pump pressure very low error 2)
- Failure code [CA2311] (Abnormality in IMV solenoid)
- Failure code [CA2555] (Intake heater relay disconnection error)
- Failure code [CA2556] (Intake heater relay short circuit error)
- Failure code [D150KA] (Emergency steering relay: Disconnection)
- Failure code [D150KB] (Emergency steering relay: Short circuit)
- Failure code [D150KY] (Emergency steering relay: Short circuit with power supply line)
- Failure code [D160KA] (Backup lamp relay: Disconnection)
- Failure code [D160KB] (Backup lamp relay: Short circuit)
- Failure code [D191KA] (Joystick steering neutral safety relay: Disconnection)
- Failure code [D191KB] (Joystick steering neutral safety relay: Short circuit)
- Failure code [D192KA] (ECSS solenoid: Disconnection)
- Failure code [D192KB] (ECSS solenoid: Short circuit)
- Failure code [D192KY] (ECSS solenoid: Short circuit with power supply line)
- Failure code [D193KA] (Joystick steering solenoid cut relay: Disconnection)
- Failure code [D193KB] (Joystick steering solenoid cut relay: Short circuit)
- Failure code [D5ZHKA] (Terminal C signal: Disconnection)
- Failure code [D5ZHKB] (Terminal C signal: Short circuit)
- Failure code [D5ZHKZ] (Terminal C signal: Disconnection or short circuit)
- Failure code [DA80L4] (Auto grease controller: ON/OFF signals disagree)
- Failure code [DAF3KK] (Machine monitor: Low source voltage (input)
- Failure code [DAF5KP] (Machine monitor: Low output voltage)
- Failure code [DAQ0KK] (Transmission controller: Low source voltage)
- Failure code [DAQ0KT] (Transmission controller: Abnormality in controller)
- Failure code [DAQRMA] (Transmission controller option setting: Malfunction)
- Failure code [DB90KK] Work equipment controller: Low source voltage (input)
- Failure code [DB90KT] Work equipment controller: Abnormality in controller
- Failure code [DB9RMA] (Work equipment controller option setting: Malfunction)
- Failure code [DD15LD] t switch (Panel switch 1): Switch is kept pressed for long time
- Failure code [DD16LD] U switch (Panel switch 2): Switch is kept pressed for long time
Failure code [DK5CKA] (Bucket EPC lever potentiometer (Sub): Disconnection)39 topics
- Failure code [DK5FKA] (Joystick steering EPC lever potentiometer (Main): Disconnection)
- Failure code [DK5GKA] (Joystick steering EPC lever potentiometer (Sub): Disconnection)
- Failure code [DKA0KA] (Lift arm angle sensor: Disconnection)
- Failure code [DKA0KY] (Lift arm angle sensor: Short circuit with power supply line)
- Failure code [DKA0L0] (Lift arm angle sensor: Dislocation of sensor)
- Failure code [DLT3KA] (Transmission output shaft speed sensor: Disconnection)
- Failure code [DT20KB] (Transmission cut-off indicator lamp: Short circuit)
- Failure code [DUM1KB] (Remote positioner raise set indicator lamp: Short circuit)
- Failure code [DUM2KB] (Remote positioner lower set indicator lamp: Short circuit)
- Failure code [DV00KB] (Alarm buzzer: Short circuit)
- Failure code [DW4PKA] (Lift arm raise EPC solenoid: Disconnection)
- Failure code [DW4PKB] (Lift arm raise EPC solenoid: Short circuit)
- Failure code [DW4PKY] (Lift arm raise EPC solenoid: Short circuit with power supply line)
- Failure code [DW4QKA] (Lift arm lower EPC solenoid: Disconnection)
- Failure code [DW4QKB] (Lift arm lower EPC solenoid: Short circuit)
- Failure code [DW4RKA] (Bucket tilt EPC solenoid: Disconnection)
- Failure code [DW4RKB] (Bucket tilt EPC solenoid: Short circuit)
- Failure code [DW4RKY] (Bucket tilt EPC solenoid: Short circuit with power supply line)
- Failure code [DW4SKA] (Bucket dump EPC solenoid: Disconnection)
- Failure code [DW4SKB] (Bucket dump EPC solenoid: Short circuit)
- Failure code [DW4SKY] (Bucket dump EPC solenoid: Short circuit with power supply line)
- Failure code [DW7BKA] (Fan reverse solenoid: Disconnection)
- Failure code [DW7BKB] (Fan reverse solenoid: Short circuit)
- Failure code [DW7BKY] (Fan reverse solenoid: Short circuit with power supply line)
- Failure code [DWM1KA] (Work equipment neutral lock solenoid: Disconnection)
- Failure code [DWM1KB] (Work equipment neutral lock solenoid: Short circuit)
- Failure code [DWN6KA] (Lift arm raise magnet detent solenoid: Disconnection)
- Failure code [DWN6KB] (Lift arm raise magnet detent solenoid: Short circuit)
- Failure code [DWN7KA] (Lift arm float magnet detent solenoid: Disconnection)
- Failure code [DWN7KB] (Lift arm float magnet detent solenoid: Short circuit)
- Failure code [DWN8KA] (Bucket tilt magnet detent solenoid: Disconnection)
- Failure code [DWN8KB] (Bucket tilt magnet detent solenoid: Short circuit)
- Failure code [DX16KA] (Fan pump EPC solenoid: Disconnection)
- Failure code [DX16KB] (Fan pump EPC solenoid: Short circuit)
- Failure code [DX16KY] (Fan pump EPC solenoid: Short circuit with power supply line)
- Failure code [DXH1KA] (Lockup ECMV solenoid: Disconnection)
- Failure code [DXH1KB] (Lockup ECMV solenoid: Short circuit)
- Failure code [DXH1KY] (Lockup ECMV solenoid: Short circuit with power supply line)
- Failure code [DXH4KA] (1st clutch ECMV solenoid: Disconnection)
When emergency brake operates, brake oil pressure caution lamp does not operate47 topics
- Air cleaner clogging indicator lamp does not light up
- Radiator coolant level caution lamp does not light up
- Steering oil pressure caution lamp does not light up
- Abnormality in t switch (panel switch 1) input
- Abnormality in U switch (panel switch 2) input
- Abnormality in < switch (panel switch 3) input
- Abnormality in > switch (panel switch 4) input
- Method of using troubleshooting chart
- Table of failure modes and causes
- The machine does not start
- [Machine with lockup clutch (if equipped)]
- Torque converter lockup is not switched on [Machine with lockup clutch (if equipped)]
- Shocks are large at the times of starting and shifting gear
- Time lag is large at the times of starting and shifting gear
- The torque converter oil temperature is high
- Steering does not turn
- Steering does not turn [Machine with joystick steering (if equipped)]
- Steering response is low
- Turning, response of steering is poor [machine with joystick steering (if equipped)]
- Steering is heavy
- When machine turns, it shakes or makes large shocks
- [machine with joystick steering (if equipped)]
- The wheel brake does not work or does not work well
- The wheel brake is not released or it drags
- The parking brake does not work or does not work well
- The parking brake is not released or it drags (including emergency release system)
- Lift arm does not rise
- Lift arm speed is low or rising force of lift arm is insufficient
- When rising, the lift arm comes to move slowly at specific height
- The lift arm cylinder cannot hold down the bucket (Bucket floats)
- Hydraulic drifts of the lift arm is large
- The lift arm wobbles during operation
- Bucket does not tilt back
- Bucket speed is low or tilting back force is insufficient
- The bucket comes to operate slowly in the midst of tilting-back
- The bucket cylinder cannot hold down the bucket
- Hydraulic drifts of the bucket is large
- (The work equipment valve is set to "HOLD")
- Lift arm and bucket control levers do not move smoothly and are heavy
- During operation of the machine, engine speed lowers remarkably or engine stalls
- Large shock is made when work equipment starts and stops
- When work equipment circuit is relieved singly, other work equipment moves
- ECSS does not operate, and pitching, bouncing occur
- Method of using troubleshooting charts
- Engine does not start easily
- Engine does not start
- Engine does not pick up smoothly
Removal and installation of steering valve assembly9 topics
- Removal and installation of parking brake discs and plates
- Removal and installation of center hinge pin
- Removal and installation of counterweight
- Removal and installation of work equipment control valve assembly
- Removal and installation of power train pump and work equipment pump assembly
- Removal and installation of steering pump and cooling fan pump assembly
- Removal and installation of hydraulic tank assembly
- Removal and installation of work equipment assembly
- Disassembly and assembly of hydraulic cylinder assembly
Inside this manual
Real pages from this service manual (1,734 pages). Open the sample pages (PDF, 798 KB)
- Specifications, page 72: 01 Specification
- Diagram, page 878: Circuit diagram related to engine Ne speed sensor
- Troubleshooting, page 1,112: Failure code [DK5FKA] (Joystick steering EPC lever potentiometer
- Foldout diagram, page 1,705: Electrical circuit diagram (2/14)
Other manuals for this machine
Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the WA380-6 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, 1,734 pages
Quantity one is the manual described above.
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Other editions and similar models
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