JLG 150HAX Service Manual User Manual
Page 149
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SECTION 6 - SCHEMATICS
3120817
– JLG Lift –
6-21
Speed not proportional.
“High” and “Low” pots not adjusted properly.
Adjust pots to factory specifications or refer to
PQ Publication 3120304 for proper adjustment.
Cylinder drifts or drive motor slowly rotates when controller is returned to neutral. (high null bias)
Controller failed resulting in a command at neu-
tral position.
Adjust or replace microswitch.
Microswitch remained open in controller.
Replace microswitch.
Ramp too high in controller.
Set ramp as needed.
Brakes not applying in swing or drive.
Check brakes. Repair or replace if needed.
Table 6-6.Electrical System - Troubleshooting
TROUBLE
PROBABLE CAUSE
REMEDY
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