This bearing housing encloses and supports the bearing that carries the threshing mechanism drive shaft. It positions the bearing at the correct offset from the frame and maintains alignment between the drive pulley and the driven components. A worn or cracked housing allows bearing misalignment, which leads to shaft vibration and premature belt wear. The housing is supplied as a pair to replace both sides of the drive assembly simultaneously. On reinstall, clean the mounting face and torque the retaining bolts to the specification for the host machine.