This bearing supports the threshing drum shaft within the threshing unit of a harvesting machine. It is a self-aligning, double-row spherical roller bearing with a tapered bore, designed to accommodate shaft deflection and minor misalignment between the drum and the gearbox output. The C3 internal clearance allows for thermal expansion during continuous high-load operation. A worn bearing produces a low-frequency rumble from the threshing area and can lead to shaft scoring or drum imbalance if not replaced promptly. On installation, verify the shaft and housing are free of burrs, and tighten the locking collar to the manufacturer’s torque specification.