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CLSS
FUNCTION OF PC VALVE
•
It controls the engine output horsepower and pump absorbing horsepower to be constant to prevent the en-
gine from stopping.
•
When pump pressure (PP) increases, PC valve moves to the right against springs 1 and 2, and decreases
the pump discharged volume.
•
PC-EPC command current increases PC-EPC output pressure, and the PC-EPC output pressure pushes
PC valve to the right against spring. This function enables the pump absorbs 100 % of engine horsepower.
•
Pump controller controls the PC-EPC current to keep the engine speed at constant by the signal of engine
speed sensor.
10-88
10 STRUCTURE AND FUNCTION
PC500LC-10R
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