BACK -UP RING (Clark CL3290575)

A worn back-up ring can allow seal extrusion under high pressure, leading to fluid leaks. This aftermarket replacement part references Clark as the OE maker and cross-references part number CL3290575. The back-up ring functions as a rigid support positioned behind a seal to prevent deformation. Its plain mechanical role is to fill the clearance gap between mating surfaces. A common failure consequence is seal blowout, which causes sudden loss of system pressure. Verify the serial number or application, then call (562) 693-7748. Keeping a back-up ring in sound condition helps maintain seal integrity during cyclic pressure spikes.

Part number variants: CL3290575, cl3290575