Komatsu 66C 66D turbo Hydraulic System Shop Manual

SUB GROUP 1
Working (loader) hydraulics
I Ilustrations of the individual components
Hydraulic diagram of working hydraulics with servo control
and steering circuits
Hydraulic diagram with 3-9001 control valve and related
electrical system
Functional description
Control spool valve
Description and arrangement of the connections
Cross sectional View
Cross sectional view of the 3—spooI control valve
Description of the secondary pressure relief valve (shock valve)
Demand/ regulating valve
Description and arrangement Of the connections
Functional description
Pressure relief valve (servo control)
Description md arrangement of the connections
Servo control valve
Description and arrangement of the connections
Description and arrangement of the connections (3—9001)
Cross sectional view of the 3—spooI servo control valve
Pipe connection block for servo control valve
Pipe block for servo control valve (3—spool)
Directional valve
Description and arrangement of the connections

SUB GROUP 2
Working (loader) hydraulics
Fault diagnosis and possible remedies

SUB GROUP 3
Control spool valve
Secondary pressure relief valve (shock valve) testing
Test method I
Test method 2
2—stage pressure relief valve, pressure testing and adiusting
Spool valve stroke limitersr adiusting
Preswre valve youp in the float valve (emergency lowering),
adjusting
Demand/ regulating valve
Regu lating pressure, testing and adjusting
Pressure relief valve
Pressure testing and adiusting
Servo control valve
Switch for tip—in and dump—out, adiusting
Lift (loader) and bucket cylinders
Leakage tests
Test method I
Test method 2
Test method 3

3072 517 M1