JLG 330CRT Service Maintenance Manual page 46

SECTION 3 - TROUBLESHOOTING
TROUBLE
No response to drive controller
Machine drives erratically
Machine will not travel forward
Machine will not travel in reverse
High-Speed Drive function does not
operate
3-4
Table 3-2. Chassis Troubleshooting
PROBABLE CAUSE
Drive System
Joystick not activated within three sec-
onds after drive select switch is activated.
Hydraulic system oil low.
Hydraulic pump not functioning properly. Repair or replace pump.
Restricted or broken pump supply line.
Drive motor not functioning properly.
Damaged wiring on drive controller.
Drive controller not functioning properly.
Drive brake not releasing.
Microcircuit on controller improperly
adjusted.
Joystick not activated within three sec-
onds after drive switch is activated.
Hydraulic system oil low.
Restricted or broken hydraulic line or fit-
ting.
Control valve not functioning properly.
Drive motor not functioning properly.
Brake not functioning properly.
Engine will not respond when enable
switch is activated and drive controller is
activated.
No electrical signal being sent to the drive
valve cartridge.
See: Machine will not travel forward.
– JLG Lift –
REMEDY
Activate drive select switch, then activate
joystick within three seconds.
Replenish oil as necessary.
Clean, repair or replace line.
Repair or replace motor.
Repair or replace wiring.
Repair or replace controller.
Determine cause and repair or replace
brake.
Adjust microswitch on controller for
proper operation.
Activate drive switch, then activate joy-
stick within three seconds.
Replenish oil as necessary.
Clean, repair or replace line or fitting.
Repair or replace valve.
Repair or replace motor.
Repair or replace brake.
Refer to Electrical System Troubleshoot-
ing - No response to control switch.
Refer to Electrical System Troubleshoot-
ing - No response to control switch.
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