This bearing supports the cutterbar drive shaft in the header of a grain harvester. It is a double-row self-aligning spherical roller bearing with a C3 internal clearance, which allows it to accommodate minor shaft misalignment and thermal expansion during operation. The bearing sits in the housing that transmits power from the gearbox to the reciprocating knife assembly. A worn bearing produces vibration and uneven cutting, leading to increased stress on the knife drive components. The manufacturer machines the raceways to the original profile, which maintains the correct contact angle and load distribution across the roller set. On installation, ensure the shaft is clean and the housing bore is free of burrs; press the bearing onto the shaft using the inner ring only to avoid brinelling the raceway.