Hyundai R 160 LC-3, Service Manual

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If Pc is higher than Pv(In the case of arm in operation)
When the pressure of pilot signal enters, piston(A) moves to down.
When the pressure signal(Pg2) enters to chamber(Y), piston(B) moves to left and poppet(C)
opens ; Passages(5) and (6) are connected.
If pressure Pc of cylinder port chamber(2) is higher than pressure Pv of chamber(3)(In the
case of arm in operation) oil from chamber(1) pushes up check valve(C) via passages(5) and
(6) and enters chamber(3) through passage(7). Chamber(3) is connected with the tank
passage because the arm plunger is moved to right. Therefore, pressure Pc is applied to(Area
d
1
- area d
2
), pushing open poppet(E), and return oil from the cylinder rod side flows into the
tank passage.
Drain
port
VIEW Z
7
6
Piston(B)
Poppet(C)
Check(D)
Pg2
4Pi
Pilot signal port
Piston(A)
Y
d1
d2
High pressure
feed passage
Tank passage
3(Pv)
2(Pc)
1
Z
To arm
cylinder rod
(Ba1)
4
Poppet(E)
5