Komatsu PC500LC-10R Shop Manual page 185

10 STRUCTURE AND FUNCTION
The swash plate angle decreases slowly.
5.
Electronic control by PC-EPC valve
In addition to the mechanical control by springs (5), (6) electronic control by PC-EPC valve (8) is prepared
in order to match to the engine horsepower setting.
If PC valve (4) fails, the engine stops due to the excessive pump absorption horsepower.
Controller (7) changes the command current in order to shift the working mode to P, E, B or L.
PC500LC-10R
CLSS
10-91