Back-up ring for Terex HC230

The back-up ring, part number 0781 302 20, is a component used within the hydraulic systems of the Terex HC230 crane. Its primary function is to support dynamic seals, such as o-rings, preventing them from extruding into the clearance gaps between mating surfaces when subjected to high fluid pressure. By maintaining the position and shape of the primary seal, this component helps prevent fluid leakage and ensures the continued operation of hydraulic cylinders and actuators.

This component is compatible with the Terex HC230 model. It is designed to meet the specific dimensional requirements of the hydraulic assemblies found in this machine. Proper installation of this ring ensures that the sealing system remains effective under the operating pressures typical for this heavy equipment.

In hydraulic and pneumatic systems, back-up rings serve as a reinforcement for elastomeric seals. When a system operates under high pressure, the seal material may be forced into the gap between mechanical parts, leading to premature wear or failure. The back-up ring bridges this gap, providing a rigid surface that keeps the seal in place and protects it from damage, thereby supporting the overall reliability of the hydraulic circuit.