Back-up ring for Terex BT4792

The back-up ring is a component used within the topping cylinder assembly of the Terex BT4792 crane. This part functions as a support element that works in conjunction with primary seals, such as O-rings or piston seals, to prevent them from extruding into the clearance gap between mating surfaces when the hydraulic system is under high pressure.

This specific component is compatible with the Terex BT4792 model. It ensures the primary seals maintain their intended shape and sealing capacity during the operation of the lifting cylinder. Proper installation of this ring helps maintain the integrity of the hydraulic sealing system.

In hydraulic cylinders, back-up rings are used to protect softer sealing materials from being forced out of their housing under extreme pressure. By providing a rigid support surface, they prevent seal deformation and failure, which would otherwise lead to hydraulic fluid leakage and a subsequent loss of system pressure.