Jeep Cherokee 2000 Service Manual page 60

3 - 20 TUBE, 181, AND 186 FBI AXLE
DIAGNOSIS AND TESTING (Continued)
Condition
Differential 1. Insufficient lubrication.
Gears Scored
2. Improper grade of lubricant.
3. Excessive spinning of one wheel/tire.
Loss Of 1. Lubricant level too high.
Lubricant
2. Worn axle shaft seals.
3. Cracked differential housing.
4. Worn pinion seal.
5. Worn/scored yoke.
6. Axle cover not properly sealed.
Axle 1. Lubricant level low.
Overheating
2. Improper grade of lubricant.
3. Bearing pre-loads too high.
4. Insufficient ring gear backlash.
Gear Teeth 1. Overloading.
Broke
2. Erratic clutch operation.
3. Ice-spotted pavement.
4. Improper adjustments.
Axle Noise 1. Insufficient lubricant.
2. Improper ring gear and pinion
adjustment.
3. Unmatched ring gear and pinion.
4. Worn teeth on ring gear and/or
pinion.
5. Loose pinion bearings.
6. Loose differential bearings.
7. Mis-aligned or sprung ring gear.
8. Loose differential bearing cap bolts.
9. Housing not machined properly.
Possible Causes Correction
1. Replace scored gears. Fill differential with the
correct fluid type and quantity.
2. Replace scored gears. Fill differential with the
correct fluid type and quantity.
3. Replace scored gears. Inspect all gears, pinion
bores, and shaft for damage. Service as necessary.
1. Drain lubricant to the correct level.
2. Replace seals.
3. Repair as necessary.
4. Replace seal.
5. Replace yoke and seal.
6. Remove, clean, and re-seal cover.
1. Fill differential to correct level.
2. Fill differential with the correct fluid type and
quantity.
3. Re-adjust bearing pre-loads.
4. Re-adjust ring gear backlash.
1. Replace gears. Examine other gears and bearings
for possible damage.
2. Replace gears and examine the remaining parts
for damage. Avoid erratic clutch operation.
3. Replace gears and examine remaining parts for
damage.
4. Replace gears and examine remaining parts for
damage. Ensure ring gear backlash is correct.
1. Fill differential with the correct fluid type and
quantity.
2. Check ring gear and pinion contact pattern.
3. Replace gears with a matched ring gear and
pinion.
4. Replace ring gear and pinion.
5. Adjust pinion bearing pre-load.
6. Adjust differential bearing pre-load.
7. Measure ring gear run-out. Replace components
as necessary.
8. Inspect differential components and replace as
necessary. Ensure that the bearing caps are torqued
tot he proper specification.
9. Replace housing.
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