Jeep Cherokee 2000 Service Manual - page 59
DIAGNOSIS AND TESTING
GENERAL INFORMATION
Axle bearing problem conditions are usually caused
by:
•
Insufficient or incorrect lubricant.
•
Foreign matter/water contamination.
•
Incorrect bearing preload torque adjustment.
•
Incorrect backlash.
Axle gear problem conditions are usually the result
of:
•
Insufficient lubrication.
•
Incorrect or contaminated lubricant.
•
Overloading (excessive engine torque) or exceed-
ing vehicle weight capacity.
•
Incorrect clearance or backlash adjustment.
Axle component breakage is most often the result
of:
•
Severe overloading.
•
Insufficient lubricant.
•
Incorrect lubricant.
•
Improperly tightened components.
•
Differential housing bores not square to each
other.
DIAGNOSTIC CHART
Condition
Possible Causes
Correction
Wheel Noise
1. Wheel loose.
1. Tighten loose nuts.
2. Faulty, brinelled wheel bearing.
2. Replace bearing.
Axle Shaft
Noise
1. Misaligned axle tube.
1. Inspect axle tube alignment. Correct as
necessary.
2. Bent or sprung axle shaft.
2. Inspect and correct as necessary.
3. End-play in pinion bearings.
3. Refer to pinion pre-load information and correct
as necessary.
4. Excessive gear backlash between
the ring gear and pinion.
4. Check adjustment of the ring gear and pinion
backlash. Correct as necessary.
5. Improper adjustment of pinion gear
bearings.
5. Adjust the pinion bearings pre-load.
6. Loose pinion yoke nut.
6. Tighten the pinion yoke nut.
7. Scuffed gear tooth contact surfaces.
7. Inspect and replace as necessary.
Axle Shaft
Broke
1. Misaligned axle tube.
1. Replace the broken shaft after correcting tube
mis-alignment.
2 Vehicle overloaded.
2. Replace broken shaft and avoid excessive weight
on vehicle.
3. Erratic clutch operation.
3. Replace broken shaft and avoid or correct erratic
clutch operation.
4. Grabbing clutch.
4. Replace broken shaft and inspect and repair
clutch as necessary.
Differential
Cracked
1. Improper adjustment of the
differential bearings.
1. Replace case and inspect gears and bearings for
further damage. Set differential bearing pre-load
properly.
2. Excessive ring gear backlash.
2. Replace case and inspect gears and bearings for
further damage. Set ring gear backlash properly.
3. Vehicle overloaded.
3. Replace case and inspect gears and bearings for
further damage. Avoid excessive vehicle weight.
4. Erratic clutch operation.
4. Replace case and inspect gears and bearings for
further damage. Avoid erratic use of clutch.
XJ
TUBE, 181, AND 186 FBI AXLE
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