This spherical roller bearing supports the threshing drum shaft within the combine harvester. It accommodates both radial and axial loads while allowing for slight shaft misalignment that occurs during operation. A worn bearing produces a low-frequency rumble and increased vibration at the drum, which can lead to shaft seal failure and contamination of the lubrication system. The bearing is produced to the original internal clearance specification, which maintains the correct running temperature and load distribution under the variable speeds of the threshing mechanism. On installation, ensure the housing bore is clean and apply the specified preload to the lock nut.