1. Thoroughly clean, rinse and dry the gearbox parts.
2. Inspect the clutch and gearbox housings, as well as the rear cover. They should not have cracks or chips. There should be no nicks, scratches, dents, etc. on the mating surfaces. Remove minor damage with sandpaper. If severely damaged, replace defective parts.
3. Check the bearing seats in both crankcases. These surfaces must not show signs of wear or damage. If there is damage, replace the crankcases.
4. Check up a condition of rods of inclusion of transfers. If they are bent or scuffed, burrs or holes for the retainers appear, replace the rods. Check the condition of the shift forks. If the forks are bent or the tabs are worn, replace these parts.
5. If oil leaks through the seals are detected during operation, as well as wear of the working edges, the seals must be replaced.
6. Check the condition of the bearings. In the presence of pitting (shells) on treadmills and rolling elements, traces of indentation of rolling elements on treadmills or in case of damage to the cages, the bearings must be replaced.
7. Replace damaged or heavily compressed gaskets.