This washer sits between the lower-link ball joint and the tractor chassis on the three-point hitch assembly. It distributes clamping load from the retaining nut across the mounting face, preventing localized deformation of the casting. A worn or missing washer allows the link to shift under load, which introduces play in the hitch and can cause uneven implement attachment. Manufactured by AGCO, the part is formed to the original thickness and hole geometry so that the lower-link pin retains its correct axial clearance without shimming. On reinstall, confirm the washer is seated flat against the chassis face before torquing the retaining nut.