This tapered roller bearing is the final-drive component that supports the axle shaft and absorbs radial and axial loads from the wheel hub. It sits inside the axle housing, between the sun gear and the planet carrier, where it maintains gear mesh alignment under heavy drawbar and lifting forces. A worn bearing produces a growling noise during turns and allows measurable hub play, which accelerates seal wear and can lead to lubricant leakage. The original manufacturer machines the raceway geometry to match the housing bore and shaft journal, so the preload setting from the factory is preserved without shimming. On installation, clean the housing bore thoroughly and apply the specified lubricant before seating the cone.