Bearings are what enable the gears to rotate easily. They are usually designed away from bronze or brass, they usually fit into races (or grooves) in the gearbox housing. Contaminants can enter your gearbox oil by vents or maybe the fill tube throughout checking/filling. Most of the time, having said https://filtergearbox79000.ttblogs.com/13761112/getting-my-filter-gearbox-to-work