This rubber cover protects the ball joint and pivot area of the rear three-point hitch lower link. It seals the joint against dirt, moisture, and crop debris that would otherwise accelerate wear on the spherical bearing surface. A torn or missing cover allows contamination into the joint, leading to slop in the hitch arms and reduced control of the attached implement. The cover is molded to match the original geometry of the linkage assembly, so it seats against the retaining groove without requiring adhesive or additional fasteners.