This hydraulic cylinder seal kit contains the gaskets and seals needed to restore leak-free operation of the lift-cylinder assembly on the three-point hitch. The kit replaces all static and dynamic seals in the cylinder, preventing external oil leakage and internal bypass that would cause the hitch to drift or lose lifting force. A worn seal pack allows hydraulic fluid to pass between chambers, reducing cylinder holding pressure and causing slow or incomplete implement lift. The original AGCO kit uses rubber compounds matched to the cylinder bore and piston groove dimensions, so the seals seat correctly without additional shimming or modification. When installing, clean the cylinder bore and piston rod thoroughly, lubricate the new seals with clean hydraulic oil, and torque the cylinder end cap to the manufacturer's specification.