JLG sky trak mmv Service Manual page 207

5.2.9 Axle Assembly Troubleshooting (Continued)
Problem
6. Axle overheating.
7. High steering effort required.
8. Slow steering response.
9. Excessive noise when brakes
are engaged.
10. Brakes will not engage.
11. Brakes will not hold the
vehicle or braking power
reduced.
Model MMV Rev. 12/04
Cause
1. Oil level too high.
2. Axle and/or wheel end housings
filled with incorrect oil or oil
contaminated or oil level low.
1. Steering (hydraulic) system not
operating properly.
2. Excessive joint housing swivel
bearing preload.
3. Worn or damaged swivel
bearings.
1. Steering (hydraulic) system not
operating properly.
2. Steering cylinder leaking
internally.
1. Brake discs worn.
2. Brake discs damaged.
1. Brake (hydraulic) system not
operating properly.
2. Brake piston o-rings and seals
damaged (leaking).
1. Brake discs worn.
2. Brake (hydraulic) system not
operating properly.
3. Brake piston o-rings and seals
damaged (leaking).
Axles, Wheels and Tires
Remedy
1. Fill oil to correct level with
Universal Tractor Fluid (refer to
Section 2.13.11, a. Axle Oil
Level Check ).
2. Drain axle and fill to correct level
with Universal Tractor Fluid
(refer to Section 2.13.11, b. Axle
Oil Change and/or Section
2.13.13, b. Wheel End Oil
Change ).
1. Refer to Section 9.8, Hydraulic
Circuits and Troubleshooting .
2. Correct bearing preload by
adding or removing shims as
needed.
3. Replace swivel bearings as
needed.
1. Refer to Section 9.8, Hydraulic
Circuits and Troubleshooting .
2. Repair or replace steering
cylinder as needed.
1. Check brake discs for wear
(refer to Section 2.13.12, Brake
Disc Wear Check ).
2. Replace brake discs.
1. Refer to Section 9.8, Hydraulic
Circuits and Troubleshooting .
2. Replace o-ring and seals.
1. Check brake discs for wear
(refer to Section 2.13.12, Brake
Disc Wear Check ).
2. Refer to Section 9.8, Hydraulic
Circuits and Troubleshooting .
3. Replace o-ring and seals.
5.15