Jeep 1997 Grand Cherokee Service Manual page 77

ZG
DIAGNOSIS AND TESTING (Continued)
CONDITION
LOSS OF LUBRICANT
AXLE OVERHEATING
GEAR TEETH BROKE (RING
GEAR AND PINION)
AXLE NOISE
CONTINUED
POSSIBLE CAUSES
2. Worn axle shaft seals.
3. Cracked differential housing.
4. Worn drive pinion gear shaft
seal.
5. Scored and worn yoke.
6. Axle cover not properly sealed.
1. Lubricant level too low.
2. Incorrect grade of lubricant.
3. Bearings adjusted too tight.
4. Excessive gear wear.
5. Insufficient ring gear backlash.
1. Overloading.
2. Erratic clutch operation.
3. Ice-spotted pavements.
4. Improper adjustments.
1. Insufficient lubricant.
2. Improper ring gear and drive
pinion gear adjustment.
3. Unmatched ring gear and drive
pinion gear.
4. Worn teeth on ring gear or drive
pinion gear.
5. Loose drive pinion gear shaft
bearings.
6. Loose differential bearings.
7. Misaligned or sprung ring gear.
8. Loose differential bearing cap
bolts.
DIFFERENTIAL AND DRIVELINE
CORRECTION
Replace worn seals.
3. Repair or replace housing as
necessary.
4. Replace worn drive pinion gear
shaft seal.
5. Replace worn or scored yoke and
seal.
6. Remove cover and clean flange
and reseal.
1. Refill differential housing.
2. Drain, flush and refill with correct
amount of the correct lubricant.
3. Readjust bearings.
4. Inspect gears for excessive wear
or scoring. Replace as necessary.
5. Readjust ring gear backlash and
inspect gears for possible scoring.
1. Replace gears. Examine other
gears and bearings for possible
damage.
2. Replace gears and examine the
remaining parts for possible
damage. Avoid erratic clutch
operation.
3. Replace gears. Examine the
remaining parts for possible
damage. Replace parts as required.
4. Replace gears. Examine other
parts for possible damage. Ensure
ring gear backlash is correct.
1. Refill axle with correct amount of
proper lubricant. Also inspect for
leaks and correct as necessary.
2. Check ring gear and pinion gear
teeth contact pattern.
3. Remove unmatched ring gear
and drive pinion gear. Replace with
matched gear and drive pinion gear
set.
4. Check teeth on ring gear and
drive pinion gear for correct contact.
If necessary, replace with new
matched set.
5. Adjust drive pinion gearshaft
bearing preload torque.
6. Adjust differential bearing preload
torque.
7. Measure ring gear runout.
8. Tighten with specified torque.
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