Komatsu Wheel Loader WA420-3 service & repair manual

Description Komatsu Wheel Loader WA420-3 service & repair manual

Komatsu Wheel Loader WA420-3 pdf workshop service repair manual + operation & maintenance manual

Serial numbers:
A30001 and up
H20051 and up
50001 and up

MANUAL CONTENT:
GENERAL
Specifications
Weight table
Dimensions and weights
List of lubricant and water
Outlines of service
General view of controls and gauges
Torque list

STRUCTURE AND FUNCTION
Power train
Power train system
Torque converter, transmission piping
Transmission hydraulic system diagram
Torque converter
Transmission
Clutch
Transmission control valve
Transmission solenoid valve
Pilot reducing valve
Main relief valve
Torque converter outlet port valve
Priority valve
Transmission oil pressure system diagram
H-L selector valve and range selector valve
Emergency manual spool
Electronic control modulation valve (ECMV)
Pilot oil filter
Accumulator valve
Flow valve
Check valve
Drive shaft
Axle
Differential
Final drive
Axle mount, Center hinge pin
Steering piping
Steering column, orbit-roll
Hydraulic circuit diagram for steering
Orbit-roll valve
Steering demand valve
Overload relief valve
Steering relief valve
Operation of demand valve
Emergency steering
Brake piping
Brake circuit diagram
Brake valve
Charge valve
Accumulator for brake system
Slack adjuster
Brakle circuit diagram
Brake valve (Dual circuit)
Brake valve (Single circuit)
Brake pressure regulating valve
Accumulator (For brake)
Accumulator for PPC valve
Brake Accumulator unit
Brake
Parking brake control
Parking brake
Parking brake valve
Hydraulic piping
Work equipment hydraulic circuit diagrams
Work equipment lever linkage
Hydraulic tank
PPC valve
PPC relief valve
Accumulator for PPC valve
Main control valve (up to H30296)
Relief valve (up to H30296)
Safety valve (with suction)
Suction valve
Main control valve (H30297 and up)
Safety valve with suction (H30297 and up)
Anticavitation valve (H30297 and up)
Safety valve (H30297 and up)
Hydraulic safety system
Hydr. safety system location (up to H30431)
Hydraulic safety valve (up to H30431)
Work equipment linkage
Bucket
Bucket positioner and boom kick-out
Machine monitor system
Main monitor
Maintenance monitor
Transmission auto-shift control system
Transmission controller
E.C.S.S
Sensors
Engine starting circuit
Ether start
Electric transmission control
Combination switch
Kick-down, hold switch
Transmission electric circuit diagram
Transmission cut-off switch
Transmission cut-off function
Electric parking brake control
Air-conditioner
Wiring diagrams

TESTING AND ADJUSTING
Standard value table for engine
Standard value table for chassis
Test certificate
Standard value table for electrical parts
Tools for testing, adjusting and troubleshooting
Adjusting valve clearance
Measuring compression pressure
Measuring blow-by pressure
Testing and adjusting fuel injection timing
Measuring exhaust color
Measuring intake air pressure (Boost pressure)
Measuring engine oil pressure
Testing the fan belt tension
Measuring accelerator pedal
Basic adjustment of accelerator pedal
Measuring operating force,
travel of speed lever
Measuring stall speed
Measuring torque converter, transmission, parking brake oil pressure
Method of operating manual emergency spool
Measuring clearance between tire and wheel
Measuring operating force of steering wheel
Measuring steering oil pressure
Measuring operating force, travel of brake pedal
Measuring brake performance
Testing brake oil pressure
Measuring brake disc wear
Bleeding air from brake system
Method for manual release of parking brake
Testing wear of parking brake disc
Measuring work equipment control lever
Measuring PPC valve pressure
Measuring PPC valve pressure
Measuring work equipment
Testing and adjusting bucket positioner
Testing and adjusting boom kick-out
Adjusting main monitor (speedometer module)
Checking for abnormality in fuel level sensor

DISASSEMBLY AND ASSEMBLY
PRECAUTIONS WHEN CARRYING OUT OPERATION
SPECIAL TOOL LIST
STARTING MOTOR
ALTERNATOR
OIL COOLER
FUEL INJECTION PUMP
WATER PUMP
TURBOCHARGER
THERMOSTAT
CYLINDER HEAD
TORQUE CONVERTER CHARGING PUMP
TORQUE CONVERTER, TRANSMISSION
TORQUE CONVERTER
TRANSMISSION
TRANSMISSION CLUTCH PACK
PARKING BRAKE
TRANSMISSION CONTROL VALVE
TRANSMISSION ACCUMULATOR VALVE
DRIVE SHAFT
FRONT AXLE
REAR AXLE
FRONT DIFFERENTIAL
REAR DIFFERENTIAL
DIFFERENTIAL
FINAL DRIVE
CENTER HINGE PIN
STEERING, ORBIT ROLL
STEERING VALVE
STEERING, SWITCH PUMP
STEERING CYLINDER

MAINTENANCE STANDARD
Engine mount, transmission mount
Torque converter
Transmission
Transmission control valve
Drive shaft
Differential
Final drive
Axle mount
Steering column, orbit roll
Steering valve
Steering cylinder mount
Slack adjuster
Brake valve
Brake
Parking brake
Torque converter, transmission pump
Steering, switch pump
Hydraulic, PPC pump
PPC valve
Cut-off valve
Main control valve
Boom cylinder
Bucket cylinder
Center hinge pin
Work equipment linkage
Bucket
Bucket positioner and boom kick-out

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