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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 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 4. Excessive gear backlash 4. Check adjustment of the ring gear and 5. Improper adjustment of pinion 5. Adjust the pinion bearings pre-load. 6. Loose pinion companion flange 6. Tighten the pinion companion flange 7. Scuffed gear tooth contact 7. Inspect and replace as necessary. Axle Shaft Broke 1. Misaligned axle tube. 1. Replace the broken shaft after 2 Vehicle overloaded. 2. Replace broken shaft and avoid 3. Erratic clutch operation. 3. Replace broken shaft and avoid or 4. Grabbing clutch. 4. Replace broken shaft and inspect and Differential Cracked 1. Improper adjustment of the 1. Replace case and inspect gears and 2. Excessive ring gear backlash. 2. Replace case and inspect gears and 3. Vehicle overloaded. 3. Replace case and inspect gears and 4. Erratic clutch operation. 4. Replace case and inspect gears and Differential Gears Scored 1. Insufficient lubrication. 1. Replace scored gears. Fill differential 2. Improper grade of lubricant. 2. Replace scored gears. Fill differential 3. Excessive spinning of one 3. Replace scored gears. Inspect all 3 - 66 8 1/4 AND 9 1/4 AXLE DN DIAGNOSIS AND TESTING (Continued) |