This bearing supports the metering shaft that drives the seed disc in the cleaning unit of a grain harvester. It is mounted on the shaft housing and maintains alignment between the shaft and the drive pulley. A worn bearing causes shaft wobble, which leads to uneven seed metering and increased belt wear. The manufacturer machines the raceway to the same internal clearance as the original assembly, so no shimming is required during installation. Press the bearing onto the shaft until it seats against the shoulder, then secure the retaining ring.