Komatsu PC200-8M0 Shop Manual page 216

SEN06121-00
2) When travel is stopped
q As the travel lever is placed in neutral, counter-
balance valve spool (19) returns to the neutral
position and closing the parking brake circuit.
q The pressurized oil in chamber (e) of brake
piston (12) passes through orifice (f) of brake
piston (12) and is drained to the motor case.
q Brake piston (12) is pushed to the right by
spring (11).
Plate (13) and disc (14) are pushed together,
q
and the brake is applied.
q As brake piston (12) returns, flow of pressur-
ized oil is reduced with slow return valve (22).
q The time delay will be set to activate the brake
only after the machine has stopped.
18
10-403
403 Hydraulic system, Part 3
Travel motor
PC200, 200LC, 220, 220LC-8M0