One New Aftermarket Replacement Track Adjuster Threaded Nut Fits Case Crawler DozersThis threaded track adjuster nut is used in the mechanical track tensioning system on Fits Case 310 series crawler dozers. It threads onto the track adjuster bolt (Fits Case D20845) at the front idler assembly to set and hold track tension by positioning the idler carrier. Proper track tension is critical for undercarriage longevity and safe dozer operation.Specifications Size: 1 inch Application: Mechanical track adjuster assembly, front idler/recoil spring system Used with adjuster bolt: Fits Case D20845 (1" diameter x 26" long, sold separately) Compatible ModelsFits Case (IH / Fits International Harvester) Crawler Dozers: 310, 310C, 310D, 310E, 310F, 310G, 420, 420CReplaces Part Number(s):D20843, D20843-ANew aftermarket replacement part - not remanufactured, not used.