This ball bearing supports the seeding disc on the grain seeder, allowing the disc to rotate freely as it opens the seed furrow. It is a double-sealed bearing, which helps keep lubricant in and contaminants out during field operation. A worn bearing introduces play in the disc hub, causing uneven seed placement and potential damage to the hub bore. The bearing is pressed into the housing and retained by the hub assembly; when replacing, ensure the new bearing is fully seated and the retaining hardware is torqued to specification.