Lull 944E-42 Service Manual - Manual (Page 161)

5.15 Model 644E-42/944E-42 Rev. 6/04
Axles, Drive Shafts, Wheels, Tires and Brakes
5.3.9 Axle Internal Component
Troubleshooting
Note: The following conditions may be noticed when
inspecting parts during axle repair. Perform all remedies
that apply to the conditions noticed.
Problem Cause Remedy (See Note)
1. Differential ring gear teeth
broken on the heel of the
tooth.
1. Incorrect alignment of ring and
pinion gears (excessive play).
2. Incorrect pinion (input) shaft
bearing preload.
• Replace ring and pinion gears.
• Adjust ring and pinion alignment
and bearing preload as described
in the ZF Repair Manual.
2. Differential ring gear teeth
broken on the toe of the
tooth.
1. Incorrect alignment of ring and
pinion gears (insufficient play).
2. Incorrect pinion (input) shaft
bearing preload.
• Replace ring and pinion gears.
• Adjust ring and pinion alignment
and bearing preload as described
in the ZF Repair Manual.
3. Rapid differential ring and
pinion gear teeth wear.
1. Insufficient lubrication.
2. Lubricant contaminated.
3. Incorrect lubricant.
• Replace ring and pinion gears.
• Drain axle and fill to correct level
with Universal Tractor Fluid. (Refer
to the appropriate Owners/
Operators Manual.)
4. Differential ring and pinion
gear teeth overheated.
1. Insufficient lubrication.
2. Lubricant contaminated.
3. Incorrect lubricant or level.
• Determine the cause of the
problem and correct.
• Replace ring and pinions gears.
• Drain axle and fill to correct level
with Universal Tractor Fluid. (Refer
to the appropriate Owners/
Operators Manual.)
5. Gear teeth pitted. 1. Insufficient lubrication.
2. Lubricant contaminated.
3. Foreign objects in oil.
• Determine the cause of the
problem and correct.
• Replace gears.
• Drain axle and fill to correct level
with Universal Tractor Fluid. (Refer
to the appropriate Owners/
Operators Manual.)
6. Worn or pitted bearings. 1. Incorrect bearing preload.
2. Insufficient lubrication.
3. Lubricant contaminated.
• Determine the cause of the
problem and correct.
• Replace bearings.
• Adjust bearing preload as
described in the ZF Repair
Manuals.
• Drain axle and fill to correct level
with Universal Tractor Fluid. (Refer
to the appropriate Operators
Manual.)