This ball bearing supports the rotating shaft of the straw walker assembly in the threshing unit. It is a double-sealed, deep-groove bearing that handles radial and moderate axial loads from the oscillating motion of the walkers. A worn bearing produces increased vibration and noise in the walker frame, which can lead to misalignment of the drive mechanism. The manufacturer specifies this bearing to match the original housing bore and shaft journal tolerances, so no shimming or adapter sleeves are required for installation. On replacement, inspect the housing bore for fretting wear and clean the shaft seating surface before pressing the bearing into place.