Back up ring for Link-Belt LS308-11

The CBA0403 back up ring serves as an auxiliary component within hydraulic and pneumatic sealing systems. Its primary function is to provide mechanical support to primary seals, such as O-rings or lip seals, by being positioned behind them. This support prevents the primary seal from extruding or deforming into the gaps between metal surfaces when the system is subjected to high pressure, thereby maintaining the integrity of the hydraulic circuit.

This component is compatible with Link-Belt LS308-11 and LS308H-ll cranes. These machines utilize hydraulic systems for lifting and positioning tasks, where back up rings are typically installed within hydraulic cylinders for the boom, outriggers, or steering assemblies. By ensuring the primary seal remains in its correct position, the component helps prevent fluid leakage and maintains the operational efficiency of the crane's hydraulic functions.

In general engineering, a back up ring is used to bridge the clearance gap between mating parts in a hydraulic assembly. By resisting the pressure that would otherwise force a softer seal into the clearance space, the back up ring helps preserve the sealing function of the primary seal. Proper installation of this component is necessary to ensure the hydraulic system operates within its design parameters.