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3-25
TRAVEL CIRCUIT OPERATION
VB
VA
Ps
DR
MB
MA
LH
MA
MB
Ps
VA
VB
RH
DR
REG
REG
T*
TURNING
JOINT
TO/FROM MAIN CONTROL VALVE
OVERLOAD
RELIEF VALVE
COUNTER
BALANCE VALVE
TRAVEL MOTOR DEVICE
C
A
D
B
Dr
P
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 350 kgf/cm
2
(4980 psi) to prevent high pressure
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.
1)
2)
140L3HC19A
Summary of Contents for HX130 LCR
Page 11: ...1 1 SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10 ...
Page 174: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV ...
Page 536: ...8 108 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29 ...
Page 566: ...8 138 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10 ...