Back-up ring for Terex BT4792

The back-up ring, part number 221107, serves as an auxiliary component within the hydraulic systems of the Terex BT4792 crane. It functions by providing support to primary sealing elements such as O-rings or piston and rod seals. By occupying the clearance gap between mating surfaces, the ring prevents the softer primary seal from being forced into the gap when the hydraulic system operates under high pressure. This support ensures that the primary seal maintains its intended shape and sealing capacity, preventing fluid leakage and pressure loss during crane operations.

This component is specifically compatible with the Terex BT4792 model. It is designed to be installed in conjunction with primary seals to maintain the integrity of the hydraulic assembly. In hydraulic applications, back-up rings are used to protect seals from extrusion, which is a common failure mode in systems subjected to significant pressure cycles. By preventing the deformation of the primary seal, the back-up ring helps maintain consistent hydraulic performance and prevents premature seal failure.