This oil seal sits at the front axle output shaft, retaining lubricating oil inside the housing while excluding dirt and moisture from the wheel-end environment. It is a radial lip seal that rides on the rotating shaft surface; the sealing lip maintains contact pressure through an integral garter spring. A worn seal allows oil to weep past the lip, which can lead to bearing starvation and eventual axle failure if not addressed. The seal is manufactured by Corteco to match the original housing bore and shaft contact geometry, so the interference fit and lip pressure remain within the design range. On installation, inspect the shaft contact surface for scoring or wear, and lubricate the seal lip before pressing it into the bore.