Komatsu ecot3 PC300LC-8 Shop Manual page 164

SEN01994-01
4. When abnormally high pressure is gener-
ated
q If pressure (PR) of self pressure reducing
valve becomes abnormally high, ball (16) con-
tracts spring (15) and becomes separated from
the seat.
q Allows the pressurized oil to (TS) from port
(PR) and lowers pressure (PR).
q Protects PPC valve, solenoid valve and other
devices from abnormal pressure.
38
10 Structure, function and maintenance standard
PC300, 350-8