Back-up ring for Link-Belt 2800Q

The LBB0353 back-up ring is an auxiliary component used in conjunction with dynamic seals, such as O-rings or piston seals, within hydraulic and pneumatic systems. Its primary function is to prevent the extrusion of the main seal into the clearance gap between sealing surfaces during high-pressure operation. By providing a rigid support structure, this component ensures the primary seal maintains its integrity, preventing fluid bypass and maintaining system pressure.

This component is specifically designed for the Link-Belt 2800Q crane. It is intended to be installed within the gland or piston groove alongside the primary sealing element. Proper fitment is required to ensure the ring provides adequate support without interfering with the movement of the seal or causing excessive friction during operation.

In heavy machinery, back-up rings are essential in high-pressure hydraulic circuits, such as those found in boom cylinders, outrigger cylinders, and steering systems. When a system operates under significant load, the pressure can force a softer primary seal into the gap between moving parts. The back-up ring acts as a mechanical barrier that bridges this gap, allowing the system to manage pressure spikes effectively while protecting the primary seal from premature deformation or failure.