3-24
SWING CIRCUIT OPERATION
SH
VA(CW)
VB(CCW)
DR
MA
MB
AU
PG
REG
SPRING 4k
SWING MOTOR
PARKING BRAKE
BRAKE OFF
BRAKE ON
BRAKE RELEASE VALVE
MAKE UP PORT(MU)
MAKE UP VALVE
MOTOR BRAKE VALVE
ANTI-INVERSION VALVE
TO / FROM MAIN CONTROL VALVE
MOTOR BRAKE VALVE
Motor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing
operation and controls the swing motor operating pressure.
MAKE UP VALVE
The make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.
PARKING BRAKE
This is function as a parking brake only when the swing control lever and arm in control lever are
not operated.
PARKING BRAKE "OFF" OPERATION
The parking brake is released by the pilot pressure oil from the pilot pump.
When the swing control lever or arm in control lever placed in the operating position, the pilot oil
flows into SH port through the MCV. This pressure transferred to the brake release valve and the
brake release valve is change over. Then the pilot oil pressure PG lift the brake piston and release
the parking brake.
PARKING BRAKE "ON" OPERATION
When the swing control lever and arm in control lever placed in the neutral position, the pressure of
the pilot oil passage down.
Then the brake release valve returned to the neutral position and the oil is returned from the brake
piston to the hydraulic oil tank. And the brake is set to 'ON'.
ANTI-INVERSION VALVE
This anti-inversion valve absorbs shocks produced as swing motion stops and reduced oscillation
cause by swing motion.
1)
2)
3)
4)
140L3HC18A
Содержание HX145 LCR
Страница 11: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Страница 204: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV...
Страница 553: ...8 82 Insert O rings to the relief valve 30 and reassemble them to rear cover 20 This completes assembly 17 32038SM42...
Страница 627: ...8 155 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Страница 636: ...8 164 125LCR8TM61 After assembling spring 44 in order clamp plug 41 Tightening torque 5 kgf m 36 lbf ft 31...
Страница 657: ...8 185 8 185 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...
Страница 668: ...8 196 14 15 3 Install cover 3 to body 1 and tighten bolts 14 Torque 10 12 5 kgf m 72 3 90 4 lbf ft 7 21078DA10...