This PTO hitch pin connects the tractor's three-point linkage to the implement drawbar, transmitting draft force from the tractor chassis to the towed load. It passes through the clevis of the hitch arm and the implement's hitch ring, securing the coupling with a retaining clip or linchpin. A worn pin develops a groove at the contact face, which allows lateral play between the tractor and implement, causing clatter and accelerated wear of the hitch clevis bore. The pin is machined to the original cross-section profile, so it seats fully in the clevis without clearance that would allow fretting. On installation, ensure the retaining clip is fully seated in the pin's groove and that the pin rotates freely in the clevis before locking.