This bearing-with-housing assembly supports the cutterbar drive on the header of a grain harvester. It mounts at the drive input point and carries the rotating shaft that transmits power to the knife-drive mechanism. The four-bolt flange secures the unit to the header frame, while the bearing bore accepts the drive shaft. A worn bearing produces play in the cutterbar drive, leading to uneven knife stroke and increased vibration. The housing is sealed to retain lubrication and exclude crop debris. On replacement, ensure the mounting bolts are torqued to specification and that the drive shaft aligns freely in the bore before tightening.