Komatsu PC500LC-10R Shop Manual page 115

10 STRUCTURE AND FUNCTION AUTO-DECELERATION SYSTEM
OPERATION OF AUTO-DECELERATION SYSTEM
A: All work equipment control levers are in NEUTRAL
B: Work equipment control lever is operated
C: Speed which is set with fuel control dial
D: Engine control speed (approximately 1000 rpm)
E: 4 seconds
F: 2 seconds or less
G: 1 second or less
When the control lever is in NEUTRAL
Auto-deceleration system is a system that decreases the engine speed to approximately 1000 rpm when all the
control levers remain NEUTRAL more than four seconds with the engine running at approximately 1000 rpm or
more. It holds the control speed ( approximately 1000 rpm)) until any control lever is operated.
When the control lever is operated
When any control lever is operated while the engine speed is kept at the control speed (approximately
1000 rpm), the engine speed increases in a moment to the speed being set with the fuel control dial.
PC500LC-10R 10-21