Won’t climb grade, Overview of procedure, Check for these obvious conditions first – JLG 15VPSP Service Manual User Manual

Page 74: Batteries are fully charged (24 volts), Speed control is set to maximum, Is platform load within the maximum rated capacity, Table 3-14. won’t climb grade, Won’t climb grade -20

SECTION 3 - TROUBLESHOOTING

3-20

– JLG Lift –

3120728

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

Table 3-14. Won’t Climb Grade

STEP

ACTION

SPEC

YES

Does machine drive straight on a level surface?

—

Go to Step 2

Refer to Machine

Won’t Drive

Straight

(Table 3-18)

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

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

Check the amperage output of the on the drive motor leads. They
should not exceed 70 amps while pulling a grade.

—

Controller will

Shut Drive Down

and will flash a 7

LED Code

Go to Step 5

Check the condition of the drive motor brushes.

—

OK, go to Step 6

Worn down,

replace brushes

or drive motor

If all above is OK, Drive motors are working properly. Consult Fac-
tory.

—