Komatsu Galeo BR380JG-1E0 Shop Manual page 172

SEN01353-00
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
pump controller, it generates the EPC output
pressure in proportion to the size of the signal,
and outputs it to the control valve.
30
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
q
the controller to coil (14), coil (14) is de-ener-
gized.
Spool (11) is pushed to the right by spring (12).
q
Port (P) closes and the pressurized oil from the
q
self pressure reducing valve does not flow to
the control valve.
The pressurized oil from the control valve is
q
drained to the tank through port (C) and port
(T).
BR380JG-1E0