Komatsu PC500LC-10R Shop Manual page 262

COMPONENT PARTS OF HYDRAULIC SYSTEM
OPERATION OF SELF-PRESSURE REDUCING VALVE OF CONTROL VALVE
When the engine is stopped
1.
Since poppet (11) is pressed to the seat by spring (12), the
circuit between port (PR) and port (TS) is closed.
2.
Since valve (14) is pressed to the left by spring (13), the
circuit between port (P2) and port (TS) is closed.
3.
Since valve (7) is pressed to the left by spring (8), the cir-
cuit between port (P2) and port (A2) is closed.
10-168
10 STRUCTURE AND FUNCTION
PC500LC-10R
AEP21622