Komatsu PC200-8M0 Shop Manual page 195

402 Hydraulic system, Part 2
Functions and operation by valve
2-stage suction-safety valve
[Installed to port (B) of the service valve]
1. Spring
2. Piston
3. Spring
4. Holder
Function
This valve has two settings for its set pressure.
q
q This valve is set to the low-pressure setting when the pilot pressure is applied to it from the attachment
circuit selector solenoid valve.
ON/OFF of the pilot pressure changes the set pressure according to the type of the installed attachment
q
(breaker, crusher, etc.).
q The set pressure of this valve is determined by the load at installed length of spring (1). (High-pressure
side)
The set pressure of the low-pressure setting is determined by the travel of the piston.
q
PC200, 200LC, 220, 220LC-8M0
SEN06120-00
53
10-402