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10 Structure and function
Travel motor
Parking brake
(PC88MR-C4A0-041-K-00-A)
Operation when travel lever is operated
When the travel lever is operated, the pressurized oil from the pump moves spool (1) to the left.
The pressurized oil flows through port (E) to chamber (A) of brake piston (2).
When the oil pressure in chamber (A) exceeds the reaction force of spring (3), it pushes brake piston (2) to
the left.
The friction force between plate (4) and disc (5) is lost and the parking brake is released.
10-128
PC88MR-10
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