RING - BACK UP (Hyster HY153858)

A damaged back-up ring can allow seal extrusion under pressure, leading to fluid bypass and system inefficiency. The Hyster catalog reference for this aftermarket replacement part is HY153858. This retaining ring type provides axial support to a primary seal within a groove. Its plain mechanical function is to close the gap between the seal and the groove wall. A concrete generic failure consequence is that a worn or missing ring permits seal nibbling and eventual leakage. Keeping a back-up ring in sound condition helps maintain consistent sealing force over the service interval. Verify the serial number or application, then call (562) 693-7748.

Part number variants: HY153858, hy153858