The gearbox has bearings, gears, shafts, forks, oil seals and seals. There are a lot of moments that affect the failure of the gearbox. First of all, the lack of oil, incorrect change of gear, for example, change from high revs to a lower gear instead of higher. Then there is a breakdown (breakdown) in the gearbox. In addition to the clutch set, there are more serious gearbox failures.