Hyundai HX145LCR Manual page 187

TRAVEL CIRCUIT OPERATION
Ps
MB
VB
Valves are provided on travel motors to offer the following functions.
1) COUNTER BALANCE VALVE
When stopping the motor of slope descending, this valve to prevent the motor over run.
2) OVERLOAD RELIEF VALVE
Relief valve limit the circuit pressure below 350 kgf/cm
generated at a 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.
TRAVEL MOTOR DEVICE
LH
DR
REG
MA
VA
A
C
TO/FROM MAIN CONTROL VALVE
OVERLOAD
RELIEF VALVE
T*
DR
MA
VA
P
B
TURNING
Dr
JOINT
D
(4980 psi) to prevent high pressure
2
3-26
RH
Ps
REG
MB
VB
COUNTER
BALANCE VALVE
140L3HC19A