A sealing device consisting of an elastomeric lip bonded to a metal case, often held tight against a spinning shaft by a small garter spring. It prevents oil or grease from leaking out of a bearing housing or gearbox while keeping moisture and abrasive dust out. Proper installation requires a smooth shaft finish and correct alignment to prevent the lip from burning up or grooving the metal.
Heard on the job
We have gear oil dripping from the output flange, so pull the yoke and press in a new radial shaft seal.
Also heard as
- lip seal
- oil seal