This sealing ring sits between the gearbox housing and the output shaft, preventing lubricant from leaking past the rotating interface. It maintains a static seal on its outer diameter while the inner lip contacts the shaft surface. A worn or hardened ring allows oil seepage, which reduces lubricant level in the gearbox and can lead to bearing or gear damage. The ring is manufactured by AGCO to match the original seal-groove geometry, so the interference fit and lip pressure are correct for the shaft speed and operating temperature. On installation, ensure the sealing lip faces the lubricant side and that the bore is free of burrs or debris.