Komatsu PC200-8M0 Shop Manual page 138

SEN06119-00
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.
26
10-401
401 Hydraulic system, Part 1
Operation
1) When signal current is 0 (coil is de-
energized)
q When there is no signal current flowing from
the controller to coil (2), coil (2) is de-ener-
gized.
q Spool (5) is pushed to the left by spring (4).
q Port (P) closes and the pressurized oil from the
self pressure reducing valve does not flow to
the LS (PC) valve.
q The pressurized oil from the LS (PC) valve is
drained to the tank through port (C) and port
(T).
PC200, 200LC, 220, 220LC-8M0
Hydraulic pump