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3-86
DIFFERENTIAL AND DRIVELINE
DIAGNOSIS AND TESTING (Continued)
SERVICE DIAGNOSIS
SERVICE DIAGNOSIS
TJ
CONDITION
I
POSSIBLE CAUSES
WHEEL NOISE
1
1 . Wheel loose .
2. Faulty, brinelled wheel bearing .
AXLE SHAFT NOISE
l . Misaligned axle shaft tube.
2. Bent or sprung axle shaft .
3 . End play in drive pinion
bearings.
4 . Excessive gear backlash
between ring gear and pinion
gear.
5 . Improper adjustment of drive
pinion gear shaft bearings .
6. Loose drive pinion georshaft
yoke nut .
7 . Improper wheel bearing
adjustment.
8 . Scuffed gear tooth contact
surfaces .
DIFFERENTIAL GEARS
I
1. Insufficient lubrication .
SCORED
LOSS OF LUBRICANT
1
I . Lubricant level too high.
CORRECTION
1 . Tighten loose nuts .
2. Faulty or brinelled bearings must be replaced .
2 . Vehicle overloaded.
3 . Erratic clutch operation .
4 . Grabbing clutch .
AXLE SHAFT BROKE
1
1 . Misaligned axle shaft tube.
2 . Excessive ring gear backlash.
3 . Vehicle overloaded.
4. Erratic clutch operation .
DIFFERENTIAL CASE
I
1 . Improper adjustment of
CRACKED
differential bearings .
2. Improper grade of lubricant .
3. Excessive spinning of one
wheel/tire.
1 . Inspect axle shaft tube alignment . Correct as necessary.
2. Replace bent or sprung axle shaft.
3. Refer to Drive Pinion Bearing Pre-Load Adjustment .
4. Check adjustment of ring gear backlash and pinion gear.
Correct as necessary.
5. Adjust drive pinion shaft bearings .
6. Tighten drive pinion gearshaft yoke nut with specified torque .
7. Readjust as necessary.
8 . If necessary, replace scuffed gears.
1 . Replace broken axle shaft after correcting axle shaft tube
alignment.
2. Replace broken axle shaft . Avoid excessive weight on vehicle .
3. Replace broken axle shaft after inspecting for other possible
causes . Avoid erratic use of clutch .
4. Replace broken axle shaft . Inspect clutch and make necessary
repairs or adjustments.
1 .
2 .
3.
4 .
Replace cracked case; examine gears and bearings for possible
damage . At reassembly, adjust differential bearings properly.
Replace cracked case; examine gears and bearings for possible
damage . At reassembly, adjust ring gear backlash properly.
Replace cracked case; examine gears and bearings for possible
damage . Avoid excessive weight on vehicle.
Replace cracked case. After inspecting for other possible
causes, examine gears and bearings for possible damage .
Avoid erratic use of clutch .
1 . Replace scored gears. Scoring marks on the drive face of gear
teeth or in the bore are caused by instantaneous fusing of the
mating surfaces. Scored gears should be replaced . Fill rear
differential housing to required capacity with proper lubricant .
Refer to Specifications .
2. Replace scored gears. Inspect all gears and bearings for
possible damage . Clean and refill differential housing to
required capacity with proper lubricant.
3. Replace scored gears. Inspect all gears, pinion bores and shaft
for damage. Service as necessary.
1. Drain excess lubricant by removing fill plug and allow lubricant
to level at lower edge of fill plug hole.
J9503- 3
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Troubleshooting
