Ai Motor Reverse-Turn Circuit - Kubota KX91-3a Workshop Manual

WSM Minor Change

7. AI motor reverse-turn circuit

Engine speed sencor
Power
Behavior:
1. When the reverse turn is selected by the motor normal/reverse-turn circuit as shown in the figure, the
battery current flows for running the AI motor in the reverse direction.
2. The reverse-turn electrical signal activates the transistors Tr4, Tr5 and Tr6 in this order. Now the bat-
tery current flows for running the AI motor in the reverse direction.
OFF by operating
the lever
AI switch OFF
Acceleration sensor
Governor sensor
Acceleration cable
AI motor reverse turn
AI controller unit
Speed
detection
AI effective with
engine started
AI pressure switch signal
Voltage change
AI control
timer circuit
Engine speed signal
Accelerator level position signal
Motor position
control circuit
Governor position signal
AI motor
return circuit
Motor normal/
reverse-turn
circuit
Error detection
LCD
setting circuit
II-150
II Service Engineering Section
AI SW
AI LCD
Current motor
position
confirmed
Reverse
Reverse turn
Output