This bearing supports the rotating shaft in the cleaning-unit drive of a grain harvester. It carries the radial and axial loads from the cleaning fan or sieve-drive assembly, maintaining alignment between the shaft and its housing. A worn bearing produces vibration and noise in the cleaning system, which can reduce separation efficiency and lead to uneven material flow across the sieves. This is the original-manufacturer part, machined to the same internal clearance and seal configuration as the factory-installed component, so it matches the housing bore and shaft diameter without requiring shimming or adapter sleeves. On installation, inspect the housing bore for scoring and replace the shaft seal if the old one shows wear.