This gasket set provides the seals needed to rebuild the hydraulic cylinder on the host tractor. It includes all O-rings, wipers, and backup rings that contact the piston rod and cylinder bore. A leaking cylinder loses holding force and allows external fluid loss, which reduces system pressure and can contaminate the surrounding area. The set matches the original seal-groove dimensions so the piston and rod seals seat correctly without modification. On installation, clean the cylinder bore and rod surface, lubricate the seals with hydraulic fluid, and avoid nicking the wiper lip during assembly.