Bearings are what enable the gears to rotate smoothly. They are generally made from bronze or brass, they usually match into races (or grooves) while in the gearbox housing. Contaminants can enter your gearbox oil by vents or maybe the fill tube throughout checking/filling. Usually, however, contaminants are the result https://louistkxhv.bleepblogs.com/34555217/a-simple-key-for-filter-gearbox-unveiled