This oil seal fits on the front axle, where it prevents lubricant leakage and keeps contaminants out of the bearing cavity. It sits between the rotating shaft and the stationary housing, maintaining a sealed boundary under normal operating pressures. A worn seal allows grease or oil to escape, which can lead to bearing starvation and eventual spindle damage. The seal lip is designed to match the original shaft contact surface, so no modification to the housing bore is required during installation. Replace the seal whenever the axle hub is disassembled, and ensure the sealing lip faces the lubricant side.