Hyundai R 160 LC-3, Service Manual

Page: 129 / 459

3 - 21
TRAVEL CIRCUIT OPERATION
TRAVEL MOTOR DEVICE
R/G R/G
dr3
P1 P2 P1 P2
Pk
a1 a2
T1 T2
Ps Ps
OVERLOAD
RELIEF
VALVE
TO/FROM MAIN CONTROL VALVE
TURNING JOINT
COUNTER
BALANCE
VALVE CHECK
VALVE
Valves are provided on travel motors to offer the following functions.
COUNTER BALANCE VALVE
When stopping the motor of slope descending, this valve to prevent the motor over run.
OVERLOAD RELIEF VALVE
Relief valve limit the circuit pressure below 350kgf/cm
2 to prevent high pressure generated at at time
of stopping the machine. Stopping the motor, this valve sucks the oil from lower pressure passage
for preventing the negative pressure and the cavitation of the motor.
1)
2)