Cleaning and Inspection

Cleaning and Inspection

Housings

Housings:

1. Clean all case/housings in solvent.
2. Inspect for the following conditions:
* Damaged gasket sealing surfaces (1)
* A loose, damaged, or restricted vent tube (2)
* Worn, scored, or loose bearing races or worn bearing race bores (3)
* Damaged drain plug (5)
* Damaged fill plug hole threads (4)
* Damaged bolt threads (6)
* Damaged oil seal bores (7)

Gears and Shafts

Gears and Shafts:

1. Clean the gears and shafts in solvent.
2. The ring gear and pinion must be inspected for proper wear and pattern.
* The end of the gear tooth farthest away from center of ring gear (1) is the heel end of the tooth.
* The end of the gear tooth nearest center of ring gear (2) is the toe end of the tooth.
* The side of the tooth that curves inward or is concave (3) is considered the coast side of the tooth.
* The side of the tooth that curves outward or is convex (4) is considered the drive side of the tooth.




3. Inspect the pinion shaft for the following conditions:
* Wear, pitting, or discoloration by heat on the gear teeth (1)
* Worn or scored shaft (2)
* Worn or damaged splines (3)
* Damaged threads (4)
* Worn bearings (5)




4. Inspect the pinion flange seating surface (2) for wear, damaged bolt threads (3) and worn or damaged splines (1).

Bearings and Races

Bearings and Races:

1. Inspect the bearing rollers and races for the following conditions:
* Pitting
* Scoring or grooves
* Excessive wear or other damage

Indentations:

2. Inspect bearing rollers and races for heat discoloration. Heat discoloration ranges from a faint yellow to a dark blue color. This discoloration may result from an overload or improper lubrication. Excessive heat causes softening of the rollers and races. Bearing races with a sign of heat discoloration must be replaced.