Won't Climb Grade - JLG 10VP Service And Maintenance Manual

SECTION 3 - 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 15% Grade (8.5 degrees)
• Does the Travel Surface allow for Proper Drive Wheel Traction
• Is Platform Load within the Maximum Rated Capacity
STEP
1. Does machine drive straight on a level surface?
2. Are both the left and right drive motor, slip-clutches, located
between the drive motor and the drive wheels, working properly?
Do the left and right drive motor brakes release properly and allow
3.
the drive wheels to rotate freely ?
Check the amperage output of the on the drive motor leads. They
4.
should not exceed 70 amps while pulling a grade.
Check the condition of the drive motor brushes.
5.
If all above is OK, Drive motors are working properly. Consult Fac-
6.
tory.
3-24
Table 3-14. Won't Climb Grade
ACTION
– JLG Lift –
SPEC YES
— Go to Step 2
— Go to Step 3
— Go to Step 4
Controller will
Shut Drive Down
—
and will flash a 7
LED Code
— OK, go to Step 6
— —
NO
Refer to Machine
Won't Drive
Straight
(Table 3-18)
Repair, Replace
or Adjust Slip
Clutch
Dragging?
Repair, Replace
or Adjust Brakes
Go to Step 5
Worn down,
replace brushes
or drive motor
—
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