Parking Brake - Hitachi ZW180 Technical Manual

PARKING BRAKE

The parking brake is a wet type multiplate disc brake.
The brake is a negative type so that it is released only
when the brake release pressure acts on the oil
chamber in the brake piston.
The parking brake is installed on 1st speed / 2nd speed
shaft of the transmission through the disc hub.
•
Applying Brake
When the parking brake switch is turned to the ON
position, the brake release pressure from the
charging block does not act on the oil chamber in
brake piston (5). Spring (6) moves brake piston (5)
leftward and brake disc (2) and brake plate (1) come
in contact tightly.
The inner surface of brake disc (2) is splined to shaft
(8) through disc hub (7). The outer surface of brake
plate (1) is fixed to brake housing (3). Therefore, the
rotation of tightly contacted brake disc (2) is stopped
so that the parking brake is applied.
•
Releasing Brake
When the parking brake switch is turned to the OFF
(Release) position, the brake release pressure from
the charging block acts on the oil chamber in brake
piston (5). Brake piston (5) moves rightward, brake
disc (2) is to be free, and the parking brake is
released.
COMPONENT OPERATION / Drive Unit
T3-9-40