JLG G12-55A Service Manual - Manual (Page 85)

5-5 G10-55A, G12-55A
Axles, Drive Shafts, Wheels and Tires
5.4.3 Axle Assembly and Drive Shaft Troubleshooting
Problem Cause Remedy
1. Excessive axle
noise while
driving.
1. Oil level too low. 1. Fill oil to correct level. Refer to Section
Note:, “Friction Modifier required for axle
differentials, see Section 2.5.3,
“Capacities.”.”
2. Axle and/or wheel end housings
filled with incorrect oil or oil level low.
2. Drain axle and/or wheel end housings
and fill to correct level with hydraulic oil.
Refer to Section Note:, “Friction Modifier
required for axle differentials, see
Section 2.5.3, “Capacities.”.”
3. Incorrect alignment of ring and
pinion gears.
3. Correct alignment by adding or
removing shims as needed.
4. Incorrect pinion (input) shaft
bearing preload.
4. Correct bearing preload by adding or
removing shims as needed.
5. Worn or damaged bearings. 5. Replace bearings as needed.
6. Worn or broken gear teeth. 6. Replace gears as needed.
7. Contamination in the axle. 7. Drain axle and/or wheel end housings
and fill to correct level with hydraulic oil.
Refer to Section Note:, “Friction Modifier
required for axle differentials, see
Section 2.5.3, “Capacities.”.”
8. Axle housing damaged. 8. Replace damaged parts.
2. Intermittent noise
when traveling.
1. Universal joint(s) worn or damaged. 1. Repair or replace universal joints
as needed.
2. Differential ring and/or pinion
gears damaged.
2. Determine cause and repair as needed.
3. Vibration or
intermittent noise
when traveling.
1. Drive shaft universal joint
assembly(ies) incorrectly tightened.
1. Tighten capscrews to correct torque.
2. Drive shaft universal joint(s) worn
or damaged.
2. Repair or replace universal joints
as needed.
3. Drive shaft(s) damaged/unbalanced. 3. Replace drive shaft(s) as needed.