Komatsu PC500LC-10R Shop Manual page 221

10 STRUCTURE AND FUNCTION
The curve when the pump secondary drive switch is turned
on, the curve (B) is further to the left than that of when the
pump controller is normal (A).
MAIN PUMP LS-EPC VALVE
LS
Abbreviation for Load Sensing
EPC
Abbreviation for Electromagnetic Proportional Control
STRUCTURE OF MAIN PUMP LS-EPC VALVE
LS-EPC valve generates EPC output pressure and outputs it to LS valve.
PC500LC-10R
COMPONENT PARTS OF HYDRAULIC SYSTEM
10-127