Back-up ring for Manitowoc 600E

The back-up ring, part number 7755435609, is a component used within the lift cylinder assembly of Manitowoc National 600E cranes. It functions as a support element within the hydraulic sealing system, working in conjunction with O-rings to maintain the integrity of the cylinder under operational loads. By providing a rigid interface, this ring prevents the extrusion of the O-ring into the clearance gaps between mating surfaces when the system is subjected to high hydraulic pressure.

This component is specifically engineered for the Manitowoc 600E lift cylinder. Proper installation of this back-up ring ensures that the primary sealing elements remain in their correct position, which helps prevent fluid leakage and maintains the operational efficiency of the hydraulic lifting system.

In hydraulic systems, back-up rings are used to protect softer sealing materials from being forced into gaps due to system pressure. By supporting the seal, the back-up ring allows the hydraulic assembly to operate effectively without the premature deformation of the O-ring, thereby reducing the risk of internal or external fluid loss during crane operation.