Won't Drive Straight - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

Won't Drive Straight

Overview Of Procedure
The following procedure examines the drive motor assembly weldments attaching the drive motors to the base frame. Also
internal components of the the drive motors, gear box and a check of the components between the gear box and the drive
wheels.
Check For These Obvious Conditions First:
• Battery voltage 24 volts. (Fully charge batteries)
• Nothing is lodged between one of the wheels and the base frame.
• A caster wheel on the front of the machine is seized up, creating resistance.
• Joystick properly calibrated per procedure in Section-2 of Service Manual.
STEP
Check for the following on the drive assembly, drive attachment
1.
weldment; is bent, has broken welds, or loose hardware.
Check for the following on the drive assembly, drive motor mounting
2.
plates; are bent, are square with drive weldments, or is hardware
loose?
Check for the following on the drive assembly, drive motor hard-
3.
ware; is hardware loose, flange bearing - bad/loose, slip clutch -
check torque settings or adjustment.
Check the left and right drive motor brakes for loose hardware & not
4.
releasing properly.
5. Inside the drive motor gear box check if; the drive shaft is exces-
sively loose & conditon of drive shaft bearings.
Are any gears broken or gear teeth excessively worn.
Is the electrical signal and amperage draw to the drive motors
6.
equal?
7. Check the drive motor brushes, do they need replaced?
8. Is the X102 wiring harness (from platform contol box to MC-1 box)
damaged, check wiring harness visually and individual wires with
ohm meter.
9. Is joystick control defective?
If possible, swap out with another platform control.
Is MC-1 control box defective or connections not tight?
10.
If possible, swap out with another MC-1 control box.
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Table 3-18. Won't Drive Straight.
ACTION
– JLG Lift –
SPEC YES
Repair/Replace/
—
Tighten weldment
Repair/Replace/
—
Tighten weldment
Repair/Replace/
— Tighten compo-
nent
Tighten or Adjust
per procedure
—
in this
Service Manual
Repair/Replace
components per
—
procedure in this
Service Manual
24 volts Recheck Steps
15 amps 1 thru 5
Replace per
— procedure in this
Service Manual
Repair or Replace
— Harness as
Required
Repair/Replace
—
Platform control
Tighten Connec-
— tions or Replace
MC-1 box
NO
Go to Step 2
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 9
Go to Step 10
—
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