2-38
ARM OUT OPERATION
ARM OUT OPERATION
During arm out operation, the pilot secondary pressure from RCV is supplied to the port Pd40 of
spring side and shifts arm 1 spool in the left direction.
The bypass passage is shut off by the movement of the arm 1 spool and the hydraulic fluid from
pump A1 flows into arm 1 spool through the P2 parallel passage. Then it enters into the arm
cylinder rod side through the load check, bridge passage, arm holding valve and the port D4.
Also, the pilot secondary pressure from RCV is supplied to the port Pd41 of spring side and shifts
arm 2 spool in the left direction.
The bypass passage is shut off by the movement of the arm 2 spool and some of the hydraulic
fluid from pump A2 bypassed through bypass notch. The rest of hydraulic fluid from pump A2
flows into the arm summation passage through P1 parallel passage, the check valve, arm 2 spool
and boom 2 spool.
Then it enters into the arm cylinder rod side with the fluid from the arm 1 spool.
The return flow from the arm cylinder head side returns to the hydraulic tank through the port C4,
the arm 1 spool and tank passage.
(2)
(2)
P2 Parallel passage
Arm 1 spool
Arm summation passage
Arm out
pilot pressure
From RCV
P2 Bypass passage
Arm summation passage
Boom 2 spool
P1 Bypass passage
P1 Parallel passage
Arm 2 spool
Bypass notch
From RCV
Arm roll out
pilot pressure
C4
D4
Pd40
Pd41
Tank passage
Load check
Arm holding valve
Check
145LCR2MC23
P1 Parallel passage
P1 Bypass passage
Check
Summary of Contents for HX145 LCR
Page 11: ...SECTION 1 GENERAL SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10...
Page 204: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV...
Page 627: ...8 155 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29...
Page 657: ...8 185 8 185 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10...
