JLG sky trak mmv Service Manual page 229

6.5.1 Transfer Case and Drive Shaft Troubleshooting (Continued)
Problem
3. Vibration or intermittent noise
when traveling.
4. Noise when coasting: even
slight transfer case noise can
be heard when vehicle is
coasting.
5. Transfer case overheating
(oil above 230° F [110° C]).
Model MMV Rev. 12/04
Cause
1. Universal joint assembly(ies)
incorrectly tightened.
2. Universal joint(s) worn or
damaged.
3. Drive shaft(s) damaged/
unbalanced.
1. Worn splines on input flange
and/or gears.
1. Build-up of mud and/or debris
on the exterior of transfer case.
2. Oil level too high or low.
3. Transfer case filled with
incorrect oil or oil contaminated.
4. Incorrect bearing "end play."
5. Worn or damage bearings.
Transfer Case and Drive Shafts
Remedy
1. Tighten capscrews to correct
torque.
2. Repair or replace universal
joints as needed.
3. Replace drive shaft(s) as
needed.
1. Replace worn parts as needed.
1. Remove mud and/or debris from
the transfer case exterior.
2. Fill oil to correct level with
recommended oil (refer to
Section 2.13.14, a. Transfer
Case Oil Level Check ).
3. Drain transfer case and fill to
correct level with recommended
oil (refer to Section 2.13.14, b.
Transfer Case Oil Change ).
4. Check bearing end play and
correct with shims as needed.
5. Replace bearings as needed.
6.15