1. Using a dial gauge, measure the final drive engagement clearance. The allowable gap is 0.10-0.15 mm.
2. Using a dial gauge, measure the driven wheel runout. Permissible runout value 0.05 mm.
3. Fix the side gear and. using a dial gauge, measure the differential gear engagement clearance. Permissible clearance is 0-0.076 mm.
Note. The measurement is made in two places of the gear.
4. If the gap exceeds the allowable value, adjust the gap using the differential housing bearing shims.
5. If adjustment is not possible, replace the differential.
6. Check the contact patch in the gearing of the main gear. For this you need:
1) Apply paint to a few teeth of the driven wheel.
2) Insert a brass rod between the final drive housing and the differential housing, then manually turn the final gear in one direction and then in the other direction.
3) Compare the resulting contact patch with the table.
Note. After each adjustment of the contact patch, it is necessary to measure the gap in the meshing of the teeth.
If the contact patch cannot be adjusted, the final drive assembly must be replaced.
7. Check the connections on the final drive housing for leaks,
8. Check bearings for wear and damage.
9. Check the final drive housing for damage and cracks.
10. Check the gearbox gears for wear and damage.
11. Check differential parts for damage.