Inspection

Inspect for the following problems, and replace any faulty parts:
1. Poor meshing, wear, and damage of the ring gear or drive pinion
2. Seizure, wear, rough rotation and abnormal noise of the bearings
3. Wear and damage of the side gears, pinion gears. or pinion shaft
4. Cracked or worn differential casing; wear at the contact point of the bearing
5. Cracked gear case; worn sliding parts
6. Damage or worn contact surface of the oil seals