Komatsu Wheel Loader WA70-7 service & repair manual

Description Komatsu Wheel Loader WA70-7 service & repair manual

Komatsu Wheel Loader WA70-7 pdf workshop service manual

Serial numbers:
H62051 and up

Technical data, specifications, maintenance, testing, troubleshooting, electrical wiring diagrams, hydraulic schematics, adjusting, assembly, disassembly, removal, installation instructions and other information

MANUAL CONTENT:
Safety
Safety notice
Preparations for work
Tipping up the driver's cab
Tipping down the driver's cab
Precautions during work
Hydraulic system
Filing method
Symbols
Hoisting instructions
Wire ropes

General
Dimensions, weights and operating data
WA70-7 – Specifications
Weight tables
Lubricants and operating mediums
Basic procedures of maintenance
Oil
Fuel
Coolant
Grease
Storing oil and fuel
Filters
Biodegradable hydraulic oils and lubricants
Outline of electric system
Torque list – Screws and nuts

Structure and Function
Powertrain
Closed circuit
Hydraulic drive system
WA70-7 – Hydraulic drive system – 20 km/h
Variable displacement pump (HST pump)
Regulating valve (DA valve)
WA70-7- Charge pump pressure relief valve - 20km/h
Control cylinder
4/3 Way valve with direction control solenoids
Pressure cut-off valve
Safety & charge valve
Towing
Variable displacement motor (HST motor with HA Control)
Hydraulic diagram HST motor A6VM80 HA1R1
Directional shuttle valve
Auto inch valve diagram (option)
Drive shaft
Front axle – Mounting
Rear axle – Mounting
Front axle
WA70-7 – Front axle with outer disc brake as service brake and parking brake
Rear axle with transfer box
Transfer box TB172
Limited slip differential
Limited slip differential – Locking value 25%
Wheel hub – Font axle and rear axle
Service and parking brake – Front axle
WA70-7 – Service and parking brake
Service and parking brake circuit
Service brake assembly
Main-brake valve
Steering articulation joint
Steering system
WA70-7 – Hydraulic circuit diagram of steering system
Priority valve
Orbit-roll-valve
Steering relief valve
Work equipment hydraulic
WA70-7 – Travel, steering and work hydraulics
Main control valve
Lift cylinder
Dump cylinder
Steering cylinder
Loader Linkage with quick-coupler
Quick-coupler
Monitor display
Special monitor functions
Monitor service menu
Gauge speed adjustment table for monitor
Sensors
Engine oil pressure sensor
Fuel level sensor
Engine coolant temperature sensor
Brake oil reservoir sensor
Pre-heater
WA70-7 – Glow plugs
Engine stop / start / preheating circuit
Electrical fuses and relays
Fuses
Relays
Engine room
Diagrams
Wiring diagrams
Hydraulic circuit diagram
Air conditioner (option)
Introduction
Function
The coolant circuit
The condenser
The vaporizer
The filter dryer
Installation of air conditioner
Safety when handling coolants
Operating the air conditioner
Maintenance of the air conditioner
Regular maintenance
Instructions for filling
Exchange of magnetic clutch
Exchange of compressor
Troubleshooting

Testing and Adjusting
Standard value table for engine
Standard value table for engine
Standard value table for chassis
Test certificate
Valve lash clearance
Engine compression test
Fuel system
Testing and adjusting fuel injection timing
V-belt tension
Engine RPM
Testing travel speed
Engine stall torque RPM
Engine stall torque RPM, test with the hydrostatic drive
Engine stall torque RPM, test with hydrostatic drive and working hydraulics
Hydraulic pressure cut-off
Working hydraulic pressure
Steering oil pressure
Testing
Operating time for steering wheel
Operating force of steering wheel
Brake
Main brake valve – basic adjustment
Brake efficiency
Measuring the stopping distance
Parking brake efficiency
Bleeding/ filling up the brake circuit
Cabin - adjustment
Proportional amplifier

Disassembly and Assembly
Starter assembly
Removal of starter assembly
Installation of starter assembly
Alternator assembly
Removal of alternator assembly
Installation of alternator assembly
Radiator assembly
Removal of radiator assembly
Installation of radiator assembly
Fan assembly
Removal of fan assembly
Installation of fan assembly
Water pump assembly
Removal of water pump assembly
Installation of water pump assembly
Fuel tank assembly
Removal and installation of fuel tank assembly
Engine cover assembly
Removal of engine cover assembly
Installation of engine cover assembly
Engine cover support assembly
Removal of engine cover support assembly
Installation of engine cover support assembly
Engine assembly
Removal of engine assembly
Installation of engine assembly
Clutch assembly
Removal of clutch assembly
Installation of clutch assembly
Main brake valve assembly
Removal of main brake valve assembly
Installation of main brake valve assembly
Priority valve assembly
Removal of priority valve assembly
Installation of priority valve assembly
Orbit-roll-valve assembly
Removal of orbit-roll-valve assembly
Installation of orbit-roll-valve assembly
Counterweight assembly
Installation of counterweight assembly
Main control valve assembly
Removal of control valve assembly
Installation of main control valve assembly
Monitor assembly
Removal of monitor assembly
Installation of monitor assembly
Articulated joint assembly
Removal of articulated joint assembly
Installation of articulated joint assembly
Variable motor assembly
Removal of variable motor assembly
Installation of variable motor assembly
Rear axle assembly
Removal of rear axle assembly
Installation of rear axle assembly
Front axle assembly
Removal of front axle assembly
Installation of front axle assembly
Front axle
Brake disc group
Brake caliper
Hydraulic principle of operation
Differential position
Mechanical principle of operation
Caliper removal
Disassembly (calliper removed)
Caliper reassembly
Replacement of guide protective covers
Pad replacement
Rear axle
Trunnions group and flange
Epicyclic reduction gear group
Wheel hub
Wheel shaft
Differential support group
Bevel gear marking test
Differential locking group
Differential group (LSD 25%)
Pinion group
Transmission box
Variable displacement pump assembly
Removal of variable displacement pump assembly
Installation of variable displacement pump assembly
Hydraulic pump assemblies
Removal of the two hydraulic pump assemblies
Installation of hydraulic pump assembly
Quick coupler assembly
Removal of quick coupler assembly
Installation of quick coupler assembly
Steering cylinder assembly
Removal of steering cylinder assembly
Installation of steering cylinder assembly
Lift cylinder assembly
Removal of lift cylinder assembly
Dump cylinder assembly
Removal of dump cylinder assembly
Installation of dump cylinder assembly
Replacing windows in driver’s cab
Stuck glass
Door and side windows
Door window assembly
Side window assembly

Diagrams
Hydraulic circuit diagram
Wiring diagram

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