This sealing ring sits in the cleaning drive of a self-propelled forage harvester or combine. It retains lubricant and excludes contaminants at the shaft passage through the housing. A worn or hardened ring allows leakage, which can lead to bearing failure in the drive assembly. The original manufacturer specifies the cross-section and material hardness to match the housing bore and shaft surface, ensuring a consistent seal under the vibration and speed of the cleaning system.