Back up ring for Terex BT4792

The back up ring, part number 058-00432, serves as a mechanical support component for primary seals within the hydraulic systems of Terex machinery. By positioning itself adjacent to an O-ring or lip seal, this component prevents the primary seal from extruding or deforming into the clearance gap between mating surfaces when subjected to high hydraulic pressure. This structural support maintains the intended geometry of the sealing assembly, ensuring the primary seal remains effective under operational loads.

This component is designed for use in the Terex BT4792 and TC4742 models. It is installed within the hydraulic circuits that manage the operation of cylinders, outriggers, and slewing systems. The ring is engineered to fit precisely within the seal groove, providing a stable surface that resists compression and maintains its shape during high-pressure cycles. By preventing seal extrusion, the component helps maintain the integrity of the hydraulic system and prevents fluid leakage at critical connection points.

In general hydraulic engineering, back up rings are used in high-pressure applications where the clearance gap between moving parts could allow a softer primary seal to be forced out of its housing. These rings are typically composed of materials with higher hardness than the primary seal to provide the necessary resistance against mechanical deformation.