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 with Rear Axle Lubricant or equivalent to prevent rusting. Inspect parts for damage. Clean the inside of rear axle housing (4010) before rebuilding. When a scored or chipped gearset is replaced, the rear axle housing must be washed thoroughly. Inspection procedures of individual parts follow:

Gears

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

Bearing Cups

Check differential bearing cups (4222) for deep scores, galling, or spalling. If a 0.038mm (0.0015 inch) feeler gauge can be inserted between a differential bearing cup and the bottom of its bore at any point around the differential bearing cup , the differential bearing cup must be reseated.

Universal Joint Flange, Rear Axle

Be sure that surfaces of rear axle universal joint flange (4851) have not been damaged in removing driveshaft (4602) or in removing rear axle universal joint flange from pinion. The end of the rear axle universal joint flange that contacts differential pinion bearing (4630) as well as the nut counterbore and flange yoke seal surface must be smooth and free of nicks.

Cone and Roller Assemblies

When operated in the rear axle pinion bearing cups (4628) , bearing rollers must turn without roughness. Examine the rollers for wear (pitting, scoring, galling or spalling). If inspection reveals either a damaged rear axle pinion bearing cup or a damaged cone and roller assembly, both parts should be replaced.

Axle Housing

Make sure that the differential bearing bores are smooth. Remove any nicks or burrs from the mounting surfaces of the rear axle housing .

Differential Case

Make sure that the hubs where the differential bearings (4221) mount are smooth. Carefully examine the differential case bearing shoulders, which may have been damaged when the differential bearings were removed. The differential bearings assemblies will fail if they do not seat firmly against the shoulders. Check the fit (free rotation) of the differential side gears (4236) in their counterbores.