JLG DVSP Series Service Manual - Manual (Page 152)

SECTION 6 - TROUBLESHOOTING
6-38 – JLG Lift – 3121136
6.13 DRIVE SYSTEM TROUBLESHOOTING
Won’t Climb Grade
Overview Of Procedure
The following procedure checks the drive motor and attached components for component failure, misadjustment due to
wear.
Check For These Obvious Conditions First:
• Batteries are Fully Charged (24 Volts)
• Speed Control is Set to Maximum
• Is Grade within the Maximum Allowable Specification of 20% Grade
• Does the Travel Surface allow for Proper Drive Wheel Traction
• Is Platform Load within the Maximum Rated Capacity
Table 6-49. Won’t Climb Grade
STEP ACTION SPEC YES NO
1. Does machine drive straight on a level surface?
— Go to Step 2
Refer to Machine
Won’t Drive
Straight
(Table 6-51)
2. Are both the left and right drive motor, slip-clutches, located
between the drive motor and the drive wheels, working properly?
— Go to Step 3
Repair, Replace
or Adjust Slip
Clutch
3. Do the left and right drive motor brakes release properly and allow
the drive wheels to rotate freely?
— Go to Step 4
Dragging?
Repair, Replace
or Adjust Brakes
4. Check the amperage output of the on the drive motor leads. They
should not exceed 100 amps while pulling a grade.
—
Controller will
Shut Drive Down
and will flash a 7
LED Code
Go to Step 5
5. Check the condition of the drive motor brushes.
— OK, go to Step 6
Worn down,
replace brushes
or drive motor
6. If all above is OK, Drive motors are working properly. Consult Fac-
tory.
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