2. Check whether there are any damages on the teeth of the final drive gears and whether the contact spots on the working surfaces of the teeth are correctly located. In case of unacceptable wear, replace the parts with new ones; if the engagement is incorrect, find the cause.
Attention! In spare parts, the driving and driven gears are supplied in a set matched for noise and contact, therefore, if one gear is damaged, both are replaced.
3. Check up a condition of apertures of satellites and surfaces of their axis; in case of minor damage to the surface, sand with fine-grained sandpaper, and in case of serious damage, replace the parts with new ones.
4. Check the surfaces of the journals of the gears of the axle shafts and their mounting holes in the differential box, repair the damage, as in the previous operation.
5. Check the surfaces of the bearing washers of the gears of the axle shafts, repair even minor damage. When replacing washers, select new ones according to their thickness.
6. Inspect the roller bearings of the drive gear and differential box; they must be wear-free, with smooth working surfaces.
7. Replace bearings at the slightest doubt about their performance, poor bearing condition can cause noise and seizing of teeth.
8. Check for deformations or cracks on the crankcase and on the differential box, if necessary, replace them with new ones.
9. Carefully inspect the drive gear oil seal. If even slight damage is found or if the working edge is worn in width up to 1 mm or more, replace the stuffing box with a new one.