Komatsu PC600LC-7 Manual page 131

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
2. When stopping travel
Operation
• When the travel lever is placed in neutral, coun-
terbalance valve spool (14) returns to the neutral
position and the circuit to the parking brake is
closed.
• The pressurized oil in chamber e of brake piston
(20) passes through the throttle of slow return
valve (7) until spool (14) of the counterbalance
valve returns to neutral.
• When spool (14) of the counterbalance valve re-
turns to the neutral position, the oil is drained in-
side the case from the throttle f of brake piston
(20) and brake piston (20) is pushed fully to the
left by spring (19).
PC600, 600LC-7
• As a result, plate (10) and disc (11) are pushed
together, and the brake is applied.
• A time delay is provided by having the pressu-
rized oil pass through a throttle in slow return
valve (7) when the brake piston returns, and this
ensures that the brake is applied after the ma-
chine stops.
TRAVEL MOTOR
10-99