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It is part of the running system of the tractor and is designed to convert the torque on the drive wheel into traction force, moving the tractor, to provide the necessary traction with the ground, creating a smooth path for the support rollers of the tractor and the distribution of tractor weight on the area determined by the width of the shoes and the length of the track section lying on the ground. Spare part of running systems for KOMATSU bulldozers - D85A-21 (number of links 39 pcs. , shoe width 560 mm, locking half link, liquid lubrication, link pitch 216 mm)