This sealing ring fits into the gearbox housing to prevent lubricant leakage between the rotating shaft and the stationary casing. It sits at the shaft exit point, where it maintains a fluid-tight barrier against oil loss and contaminant ingress. A worn or hardened sealing lip allows oil seepage that can lead to low lubricant levels and accelerated gear wear. The ring is manufactured to match the original seal groove dimensions, so no additional shimming or adapter is required during installation. On reinstall, ensure the sealing surface on the shaft is clean and free of burrs.