Front

Inspection Before Disassembly of Carrier

The differential case assembly and drive pinion should be inspected prior to removal from the carrier casting. These inspections can determine the cause of the complaint and the resolution.

1. Wipe the lubricant from the internal working parts and visually inspect the parts for wear or damage.

2. Rotate the gears. Check any roughness which would indicate worn or damaged bearings or gears.

3. Check the ring gear teeth for signs of scoring, abnormal wear or nicks/chips.

4. Set up Dial Indicator with Bracketry TOOL-4201-C or equivalent and check ring gear backlash and ring gear backface runout. Refer to the Specification for allowable conditions.


Inspection After Disassembly of Carrier

- Thoroughly clean all parts. Always use new solvent when cleaning bearings.
- Do not spin dry bearings with compressed air.
- Oil the bearings immediately to prevent rusting.
- Inspect the parts for any major damage.
- Clean the inside of the housing before rebuilding.
- When a scored or chipped gear set is replaced, the axle housing must be washed thoroughly.

Inspection procedures for individual parts are outlined below.

Gears

Examine the pinion and ring gear teeth for scoring, excessive wear, nicks and chipping. Worn, scored and damaged gears cannot be rebuilt to correct a noisy condition.

Bearing Cups

NOTE: If disassembly is required, it is recommended that new bearings be installed.

Check bearing cups for deep scores, galling, or spalling. If a 0.038mm (0.0015 inch) feeler gauge can be inserted between a cup and the bottom of its bore or any point around the cup, the cup must be reseated.

Cone and Roller Assemblies

When operated in the cups, bearing rollers must turn without roughness. Examine the roller ends for step wear. If inspection reveals either a damaged cup or a damaged cone and roller assembly, both parts should be replaced.