Bearings are what allow the gears to rotate smoothly. They are usually built out of bronze or brass, plus they fit into races (or grooves) inside the gearbox housing. Contaminants can enter your gearbox oil as a result of vents or even the fill tube throughout checking/filling. Usually, however, contaminants https://jaidenzulaq.ltfblog.com/33042417/a-review-of-filter-gearbox