This needle bearing supports the rotating shaft within the header of a combine harvester. It is a full-complement bearing, meaning it uses the maximum number of rollers to handle high radial loads in a compact radial space. The bearing is manufactured by NTN to the HK4520 dimensional standard, which matches the original housing and shaft geometry for the header assembly. A worn bearing produces audible rumbling or vibration from the header driveline and can lead to shaft misalignment if not replaced. When installing, ensure the bearing is pressed squarely into its housing bore and that the shaft rotates freely after fitment.