Komatsu PC500LC-10R Shop Manual page 113

10 STRUCTURE AND FUNCTION ENGINE CONTROL SYSTEM
Upon receipt of the throttle signals from fuel control dial (13) and pump controller (20), engine controller (8) se-
lects the lower throttle signal and sends the command current to fuel supply pump (16). Fuel supply pump (16)
adjust the fuel injection rate to control the engine speed.
Mechanism and function of engine stopping system
When starting switch (6) is turned to OFF position, the current from terminal ACC of starting switch (6) to engine
controller (8) is cut off, and the command current to fuel supply pump (16) is also cut off. Fuel supply pump (16)
stops supplying fuel, the engine speed decreases, and the engine stops.
Mechanism and function of engine stopping system with engine shutdown sec-
ondary switch
When engine shutdown secondary switch (7) is set to the engine stop position, the current from terminal ACC of
starting switch (6) to engine controller (8) is cut off forcibly. The condition becomes the same as when starting
switch (6) is turned to OFF position, and the engine stops.
PC500LC-10R 10-19