Komatsu PC200-8M0 Shop Manual page 236

SEN06121-00
3) When signal current is maximum (coil is energized)
As the signal current flows to coil (4), coil (4) is energized.
q
q When this happens, the signal current is at its maximum, so the propulsion force of plunger (5) is also at
its maximum.
Spool (2) is pushed to the left by push pin (6).
q
q The maximum volume of pressurized oil is conducted from port (P) to port (C), increasing the circuit
pressure across EPC valve and the control valve to the maximum level.
q Since port (T) is closed, pressurized oil does not flow to the hydraulic tank.
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10-403
403 Hydraulic system, Part 3
PPC valve
PC200, 200LC, 220, 220LC-8M0