Komatsu Galeo PC138US-8 Shop Manual page 130

SEN02548-01
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 PC 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 (2), coil (2) is de-ener-
gized.
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 PC valve.
The pressurized oil from the PC valve is
q
drained to the tank through port (C) and port
(T).
PC138US, USLC-8