Housings
- Clean all case/housings in solvent.
- 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 fill plug hole threads (4) |
| • | Damaged bolt threads (6) |
| • | Damaged oil seal bores (7) |
Gears and Shafts
- Clean the gears and shafts in solvent.
- 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. |
- 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) |
- Inspect the pinion flange seating surface (2) for wear, damaged bolt threads (3),
and worn or damaged splines (1).
Bearings and Races
- Inspect the bearing rollers and races for the following conditions:
| • | Excessive wear or other damage |
- 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.
