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COMPONENT PARTS OF HYDRAULIC SYSTEM
1: Valve
2: Spring
3: Piston
4: Piston
5: Swing valve spool
6: Right travel valve spool
7: Arm valve spool
8. LS shuttle valve
9: LS circuit
•
The LS separation valve of control valve prevents the high
LS pressure from the swing circuit from flowing into the LS
circuit of the work equipment valve when the combined op-
eration of swing and boom RAISE are operated.
•
It prevents high pressure which is generated when the ma-
chine swings, and improves operability of the work equip-
ment.
OPERATION OF LS SELECT VALVE OF CONTROL VALVE
When pilot pressure (BP) is cut off
1.
Since pilot pressure (BP) is cut off, piston (3) is pressed to
the left by the reaction force of spring (2).
2.
When the swing operation is performed, swing LS pres-
sure (P1) passes through swing spool (5) and enters port
(A).
3.
Swing LS pressure (P1) pushes valve (1) to the left, and
port (A) is connected to port (B).
4.
Swing LS pressure (P1) flows from port (A) through port
(B) to LS shuttle valve (8).
10-166
10 STRUCTURE AND FUNCTION
4
3
2
B
BP
u ON v
8
9
4
3
2
B
BP
u ON v
8
9
1
A
5
Swing
P1
6
P2
7
P3
AEP21619
AEP21620
1
A
5
Swing
P1
6
P2
7
P3
AEP21619
PC500LC-10R
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