SECTION 6 - TROUBLESHOOTING
6-44
31215825
Machine 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 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.
3.
Remove the Left Drive Motor power lead at the Traction Control
Module (M1) and check if the BLACK wire is connected to the positive
(+) terminal and the WHITE wire is connected to the negative (–) ter
-
minal. The Left Motor Power lead is reversed from the Right Motor
lead due to the reverser harness. (Reference Figure 6-8., Electrical
Diagram (MVL/MSP)
—
Consult
Factory
Rewire as
Necessary
Table 6-52. Machine Won’t Drive Straight
STEP
ACTION
SPEC
YES
NO
1.
Check for the following on the drive assembly, drive attachment
weldments; is bent, has broken welds, or loose hardware.
—
Repair/Replace/
Tighten weld
-
ment
Go to Step 2
2.
Check for the following on the drive assembly, drive motor mount
-
ing plates; are bent, are square with drive weldments, or is hardware
loose?
—
Repair/Replace/
Tighten weld
-
ment
Go to Step 3
3.
Check for the following on the drive assembly, drive motor hard
-
ware; is hardware loose.
—
Repair/Replace/
Tighten compo
-
nent
Go to Step 4
4.
Check the left and right drive motor brakes for loose hardware & not
releasing properly.
—
Tighten or Adjust
per procedure
in this
Service Manual
Go to Step 5
5.
Is the electrical signal and amperage draw to the drive motors equal?
Check with machine on level surface.
See Table 6-3.
Recheck Steps
1 thru 5
Go to Step 6
6.
Check the drive motor brushes, do they need replaced?
—
Replace per
procedure in this
Service Manual
Go to Step 7
7.
Is joystick control defective?
If possible, swap out with another platform control.
—
Repair/Replace
Platform control
Go to Step 8
8.
Is the Traction Control Module defective or connections not tight?
If possible, swap out with another Traction Control Module.
—
Tighten Connec
-
tions or Replace
Traction Control
Module
Go to Step 9
9.
Inside the drive motor gear box check if; the drive shaft is excessively
loose & condition of drive shaft bearings.
Are any gears broken or gear teeth excessively worn.
—
Repair/Replace gear box
components per procedure in this
Service Manual
Table 6-51. Machine Drive in Opposite Direction
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