Back up ring for Grove RT630B

The back up ring, part number 9926104779, serves as a support component within the hydraulic systems of the Grove RT630B. It is installed alongside primary seals, such as O-rings or piston seals, to provide mechanical reinforcement. By occupying the clearance gap between mating metal surfaces, this component prevents the primary seal from extruding or deforming when subjected to high operational pressures. This support maintains the integrity of the sealing assembly and ensures consistent performance of the hydraulic circuit.

This component is designed for use in the Grove RT630B rough-terrain crane. It is typically found within hydraulic cylinders, including those for lifting, extension, steering, or outrigger functions, as well as in hydraulic valve assemblies. The geometry of this ring is engineered to fit precisely within the seal groove, ensuring it provides necessary support without interfering with the movement of the hydraulic components.

Back up rings are used in hydraulic systems to manage the gap between moving parts where pressure could otherwise force a softer seal material out of its housing. By preventing this extrusion, the ring helps maintain the pressure required for the precise control of crane functions and prevents fluid leakage.