Komatsu Galeo BR380JG-1E0 Shop Manual page 109

SEN01351-00
Function
The EPC valve consists of the proportional
q
solenoid portion and the hydraulic valve por-
tion.
When it receives signal current (i) from the
q
controller, it generates the EPC output pres-
sure in proportion to the size of the signal, and
outputs it to the LS (PC) valve.
22
10 Structure, function and maintenance standard
Operation
1) When signal current is 0 (coil is
de-energized)
When there is no signal current flowing from the
q
controller to coil (2), coil (2) is de-energized.
Spool (5) is pushed to the left by spring (4).
q
Port (P) closes and the pressurized oil from the
q
self pressure reducing valve does not flow to
the LS (PC) valve.
The pressurized oil from the LS (PC) valve is
q
drained to the tank via port (C) and port (T).
BR380JG-1E0