Back up ring for Caterpillar 980C

The 4T3107 back up ring serves as an auxiliary component within the hydraulic and pneumatic sealing systems of heavy machinery. Its primary function is to provide structural support to primary seals, such as O-rings, by blocking the clearance gap between mating metal surfaces. This prevents the primary seal from being forced into the gap when the system is subjected to high hydraulic pressure. By maintaining the position and shape of the primary seal, this component helps ensure the integrity of the hydraulic circuit.

This part is specifically configured for the Caterpillar 980C wheel loader and is installed alongside hydraulic seals in cylinders, valves, or pumps. It is manufactured to precise dimensions to fit the standard grooves of the hydraulic components found in this model. Proper installation of this ring is necessary to protect the primary seal from extrusion, which can otherwise lead to fluid leakage and a subsequent loss of system pressure. Regular inspection of these seals and their associated support rings is standard practice during hydraulic system maintenance to prevent internal or external fluid bypass.