Komatsu PC200-8M0 Shop Manual page 206

SEN06121-00
Swing holding brake
1. When solenoid valve is de-energized
Operation
q As the swing holding brake is de-energized,
the pressurized oil from the self pressure
reducing valve is shut off.
q Port (B) is connected to tank circuit (T).
Brake piston (7) is pushed down by brake
q
spring (1).
q Disc (5) and plate (6) are pushed together, and
the brake is applied.
8
10-403
403 Hydraulic system, Part 3
2. When solenoid valve is energized
Operation
q As the swing holding brake solenoid valve is
energized, the valve is switched.
q The pressurized oil from the self pressure
reducing valve is conducted brake chamber (a)
through port (B).
q After entering chamber (a), the pressurized oil
compresses brake spring (1) and pushes
brake piston (7) up.
Disc (5) is separated from plate (6), releasing
q
the brake.
PC200, 200LC, 220, 220LC-8M0
Swing motor