This O-ring seals the connection between the three-point hitch linkage and the tractor chassis at the TUZ (lower link) pivot point. It prevents fluid ingress and contamination from entering the pivot bearing assembly. A worn or missing O-ring allows dirt and moisture into the joint, accelerating pin and bushing wear and causing play in the hitch arms. This original AGCO part is molded to the same cross-section and durometer as the factory seal, ensuring it compresses into the groove without distorting and maintains consistent sealing force across the operating temperature range.