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Operation when travel lever is operated
When steering lever is operated, the pressurized oil from the control valve is supplied to port (PA).
The pressurized oil pushes open check valve (1a) and flows from motor inlet port (MA) to motor outlet port
(MB).
At the same time, the pressurized oil flows into chamber (D) through orifice (c) of counterbalance valve
(2).
When the oil pressure in chamber (D) increases above the reaction force of spring (3), it pushes
counterbalance valve (2) to the left.
Ports (MB) and (PB) are interconnected and the motor starts rotating.
Ports (PA) and (E) are interconnected and the pressurized oil flows to brake piston (4) to release the
parking brake.
PC88MR-10
10 Structure and function
Travel motor
10-125
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Troubleshooting
