This bearing supports the threshing drum shaft within the threshing mechanism of the parent combine. It is a double-row self-aligning ball bearing with a tapered bore, designed to accommodate minor shaft misalignment and axial displacement that occurs during operation. The C3 internal clearance allows for thermal expansion of the shaft under load. A worn bearing produces a rumble or vibration in the threshing drum, which can lead to uneven crop feed and accelerated wear on the drum drive components. This original bearing is manufactured to the same internal geometry and raceway finish as the original assembly, so no shimming or adapter modifications are required during installation. On reinstall, ensure the shaft and housing bore are clean and free of burrs, and torque the locking collar to the specified value.