This set of sealing rings is a gasket kit for the lift cylinder on a tractor. It is installed in the cylinder that raises and lowers the three-point linkage. The rings prevent hydraulic fluid from leaking past the piston, maintaining the pressure needed to hold the implement at a set height. A worn seal set causes the lift arms to drift downward under load or to respond slowly to control inputs. Because this is an original AGCO component, the elastomer compound and cross-section match the original cylinder bore and piston groove geometry, which prevents extrusion under high pressure and maintains the correct seal squeeze. Replace all rings in the set at the same time, and lubricate the seals with clean hydraulic fluid during installation to avoid rolling or pinching them on the piston.