Bearings are what enable the gears to rotate smoothly. They are generally created outside of bronze or brass, they usually match into races (or grooves) inside the gearbox housing. Contaminants can enter your gearbox oil by way of vents or perhaps the fill tube during examining/filling. Usually, having said that, https://caidenrtqnj.topbloghub.com/40433041/what-does-filter-gearbox-mean