Komatsu PC500LC-10R Shop Manual page 283

10 STRUCTURE AND FUNCTION
When pilot pressure (P) is supplied (high pressure setting)
Pilot pressure (P) is applied to diameter (d1) of poppet (2) and added to the installed load of spring (1), and the
set pressure becomes high.
2-STAGE SUCTION-SAFETY VALVE OF CONTROL VALVE
STRUCTURE OF 2-STAGE SUCTION-SAFETY VALVE OF CONTROL VALVE
Sectional view
"Port (B) of boom valve and port (B) of service valve"
1: Spring
2: Piston
PC500LC-10R
COMPONENT PARTS OF HYDRAULIC SYSTEM
3: Spring
4: Holder
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