Back-up ring for Terex BT4792

The back-up ring, part number 221104, serves as a support component within the hydraulic system of the Terex BT4792 crane. It is installed adjacent to a primary seal, such as an O-ring, to provide structural reinforcement. By occupying the clearance gap, the ring prevents the primary seal from being forced out of its groove or deforming when the system is subjected to high hydraulic pressures.

This component is compatible with the Terex BT4792 crane model. It functions to maintain the integrity of the sealing assembly, which is necessary for the proper operation of hydraulic cylinders and valves within the machine. By preventing seal extrusion, the back-up ring helps maintain the required pressure levels within the hydraulic circuits.

In hydraulic systems, back-up rings are used to protect softer sealing elements from mechanical failure. When hydraulic fluid pressure acts upon a seal, the ring ensures the seal remains correctly positioned within its housing, thereby preventing fluid leaks and maintaining system efficiency.