Bearings are what allow the gears to rotate easily. They are generally manufactured away from bronze or brass, they usually in good shape into races (or grooves) inside the gearbox housing. Contaminants can enter your gearbox oil by vents or perhaps the fill tube during examining/filling. Usually, however, contaminants are https://lanewehhg.bloggactivo.com/33368408/filter-gearbox-things-to-know-before-you-buy