Komatsu PC88MR-10 Shop Manual page 258

10 Structure and function
Electrical control system
If any control lever is operated, the engine speed returns immediately to the speed set with fuel control dial
(4).
Operation
When control lever is at NEUTRAL
While the engine is running at approximately 1,175 rpm or higher speed, when all the control levers are
set to "NEUTRAL" positions (A) for 4 seconds or more (E), engine speed is decreased and kept to engine
control speed (D) until any control lever is "operated" (B).
When control lever is operated
While the engine speed is kept at engine control speed (D), when any control lever is operated, the engine
speed increases immediately to fuel control dial set speed (C).
A: All control levers in "NEUTRAL"
B: Control lever "operated"
C: Fuel control dial set speed
D: Engine control speed (approx. 1,175 rpm)
E: 4 sec
F: Max. 2 sec
G: Max. 1 sec
10-180 PC88MR-10