BACKUP RING (Hyster HY154359)

A worn backup ring can allow pressurized fluid to extrude the primary seal, leading to gradual leakage and reduced system efficiency. The Hyster catalog reference for this aftermarket replacement part is HY154359. This retaining ring type provides axial support to the O-ring or lip seal within a gland or groove. Its plain mechanical function is to close the clearance gap between mating components under pressure. A concrete generic failure consequence is that a missing or degraded backup ring accelerates seal wear and can cause sudden fluid loss. Keeping a backup ring in sound condition helps maintain consistent sealing force during cyclic pressure changes. Verify the serial number or application, then call (562) 693-7748.

Part number variants: HY154359, hy154359