II-147
WSM Minor Change II Service Engineering Section
4. Behavior when the control lever is returned to neutral
1. When returning the control lever back to
neutral:
• AI pressure switch at ON and accelerator
knob at MAX:
When the control lever has been placed
back to neutral, the oil flows from the pilot
pump through the neutral passage of the
control valve to the tank. The pressure
drops, which turns on the pressure
switch. In about 4 seconds, the AI motor
gets started to reduce the engine speed
to the idling level.
M
C7
C5
B1
C6
CPU
A2
A3
Lever Pilot pressure Pressure switch
Neutral Below 20 kgf/cm
2
ON
OperationAbove 25 kgf/cm
2
OFF
Electric accelerator
Engine speed indication
AI controller
AI motor
Acceleration cable
Motor drive
Engine speed sensor
Machine status
Governor position
Governor potentiometer
Governor lever
AI pressure switch
Control lever
Pilot valve
Pressure switch status
Pilot pump
AI sensing line
Main control valve
(operation or neutral)
ON
OFF
20 25
N.C.
Activated
Neutral
Accelerator
Idle
Engine speed
4 sec.
Time
lever position
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