JLG 450AJ Service Manual - Manual (Page 66)

SECTION 2 - PROCEDURES
2-50 – JLG Lift – 3120869
Clutch engaged actuator retracting
Controller fault - clutch disengaged and no actuator
movement
Failure Modes
Immediate Red Light
Action:
1. Recycle power to determine if the problem is inter-
mittent.
2. The input voltage must be greater than 10.5 Vdc.
3. Check wiring for any damage and correct.
4. Disconnect engine harness and actuator connnec-
tions.
5. If problem reoccurs return unit.
Green and either Amber light followed by a red light
or
then
Action:
1. Inspect and clean wiring connections.
2. Examine throttle linkage for any damage or bent
components and correct.
3. With linkage disconnected, check each potentiome-
ter for operation.
4. Reconnect linkage and reset each potentiometer for
correct operation.
5. If failure continues to occur, replace unit.