Komatsu WA50-3 Wheel Loader Repair Manual

Manuals: Shop Manual
General
Structure and Functions
Testing and Adjusting
Disassembly and Assembly
Maintenance Standard
Others
Manual Extract HST Piping:

The oil from HST charge pump flows through the filter to the speed related valve. The oil flow is divided into two supply circuits: one part goes to the circuit for the directional selector valve and inching valve, while the other part passes through the low-pressure relief valve and goes to the main piston pump.

The directional selector solenoid valve is actuated by the operation of the transmission
to forward or reverse, and the oil flowing to the directional selector valve then flows to the servo cylinder of the main piston pump.
The swash plate of the piston pump is angled by the operation of this cylinder, and the oil flows in the normal or reverse direction.
The oil flow that was divided before the directional selector valve flows to the inching
valve, and makes inching operations possible by opening or closing this valve