This gasket set provides the seals for the hydraulic cylinder on a tractor or vehicle. It contains all the O-rings, wiper seals, and backup rings needed to rebuild the cylinder and restore its ability to hold pressure without internal leakage. A failing cylinder will drift under load or show external oil seepage past the rod seal. The set matches the original seal-groove dimensions and material specification, so the rebuilt cylinder maintains the same friction and bypass characteristics as the factory assembly. When installing, clean the cylinder bore and rod thoroughly, lubricate the new seals with hydraulic fluid, and torque the gland nut to the manufacturer's specification.