This bearing supports the shaft that drives the feeder-house chain, which conveys crop material from the header into the threshing mechanism. It is a sealed, spherical-outer-race insert bearing designed to accommodate slight misalignment between the shaft and the housing bore. A worn bearing produces radial play that allows the shaft to wobble, leading to chain slack and uneven feeding. The manufacturer machines the raceways to the original profile, which maintains the correct internal clearance and seal contact without requiring shimming during installation.