Hyundai HX145LCR Manual page 86

6) 6) SWING OPERATION SWING OPERATION
(1) (1) SWING LEFT & RIGHT OPERATION SWING LEFT & RIGHT OPERATION
During the swing left operation, the pilot secondary pressure from the RCV is supplied to the port
Pd2 of the spring side and shift the swing spool in left direction. The bypass passage is shut off by
the movement of the swing spool and the hydraulic fluid from pump A1 flows into swing spool
through the P2 parallel passage. Then it is directed to swing motor through the port D2.
As the result, swing motor turns and flow from the swing motor returns to the hydraulic oil tank
through the port C2, swing spool and the tank passage.
In case of swing right operation, the operation is similar to swing left operation but the pilot
secondary pressure from the RCV is supplied to the port Pc2 of the spring opposite side.
Accordingly, the hydraulic fluid from pump A1 flows into swing motor through the port C2 and
returns to the hydraulic oil tank through the port D2 and the tank passage.
Swing logic valve
Tank passage
P2 Parallel passage
P2 Parallel passage
Check
C2
D2
P2 Bypass passage
P2 Bypass passage
2-34
Swing spool
From RCV
Pd2
145LCR2MC32