Komatsu ecot3 PC300LC-8 Shop Manual page 162

SEN01994-01
Self pressure reducing valve
Function
Reduces the discharge pressure of the main
q
pump and supplies it as control pressure for
the solenoid valves, EPC valves, etc.
Operation
1. While engine is stopped
q Poppet (11) is pressed by spring (12) against
the seat and port (PR) is not connected to
(TS).
q Valve (14) is pressed by spring (13) against the
left side and port (P2) is connected to (TS).
q Valve (7) is pressed by spring (8) against the
left side and port (P2) is closed to (A2).
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10 Structure, function and maintenance standard
PC300, 350-8