Hyundai HX145LCR Manual page 95

(4) The pressure at port P becomes lower than set pressure of the spring, the poppet is seated by
spring force. Then the pressure at port P becomes equal to set pressure of the spring and the
plunger is seated to the socket.
Socket
P
Housing
Tank
passage
Plunger
(5) When the power boost switch is ON, the pilot pressure enters through hole A.
It pushes the piston (B) in the left direction to increase the force of the spring and change the
relief set pressure to the high pressure.
P
Housing
Tank
passage
Poppet
T
Hole A
T
2-43
Spring
Spring Piston B
14W92MC39
14W92MC40