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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
TROUBLE SHOOTING
Quite often serious trouble in a rear axle can be
"headed off" and prevented if sufficient attention is
given to the various causes of trouble and the proper
remedy is applied. The following list gives most of the
common kinds of axle trouble and suggests a possible
cause to be corrected.
It should be noted that noises from other units of
the truck, such as propeller shafts, universal joints, tires,
and even transmissions, are often incorrectly diagnosed
as rear axle noise. This possibility should not be
disregarded when trouble shooting.
PROBLEM
CAUSE
Constant Noise
1.
Lubricant not to specified level.
2.
Incorrect kind and weight of lubricant.
3. Wheel bearings out of adjustment or defective.
4. Drive gear and pinion not in adjustment for correct tooth contact.
5. Teeth of drive gear and pinion chipped or worn.
6. Too much or too little pinion-to-gear backlash.
7. Loose or worn pinion bearings.
8. Loose or worn side bearings.
Intermittent Noise
1. Ring gear does not run true.
a. Uneven pressures on drive gear rivets.
b. Warped drive gear.
2. Loose or broken differential bearings.
Noisy on Turns Only
1. Differential pinion gears tight on cross or pinion shaft.
2. Side gears tight in differential case.
3. Differential pinion or side gears defective.
4.
Thrust washers worn or damaged.
5. Excessive backlash between side gears and pinions.
Lubricant Leaks
1. Loss through axle shafts.
a. Lubricant above specified level.
b. Incorrect kind and weight of lubricant.
c. Restricted axle housing breather valve.
d. Worn or incorrectly installed axle shaft oil seal.
2.
Loss at pinion shaft.
a. Lubricant above specified level.
b. Incorrect kind and weight of lubricant.
c. Restricted axle housing breather valve.
d. Pinion oil-seal worn or incorrectly installed.
e. Lubricant return passage in differential carrier housing restricted.
f. Universal joint companion flange loose on pinion shaft.
Rear Wheels Do Not Drive (Propeller Shaft
1. Broken axle shaft.
Rotating)
a. Loose wheel bearings.
b. Axle shaft too short.
c. Loose flange studs or nuts.
d. Bent housing.
2. Drive gear teeth stripped.
3. Side gear or differential pinion broken.
4. Differential pinion shaft or cross broken.
CTS-2095S - Chapter I - Page 16
PRINTED IN UNITED STATES OF AMERICA
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