Bearings are what allow the gears to rotate effortlessly. They are generally made out of bronze or brass, they usually in shape into races (or grooves) from the gearbox housing. Contaminants can enter your gearbox oil through vents or maybe the fill tube during examining/filling. More often than not, nonetheless, https://paxtonjjige.iyublog.com/33231812/filter-gearbox-an-overview