RING - BACK UP (Crown CR670748)

CR670748: A damaged back-up ring can allow seal extrusion under pressure, leading to fluid leakage and reduced system efficiency. This aftermarket replacement part references Crown as the OE maker and cross-references part number CR670748. The ring functions as a mechanical barrier that supports a primary seal within a groove. When the ring fails, the seal may deform and lose its sealing ability, causing gradual pressure loss. Keeping a back-up ring in sound condition helps maintain consistent sealing force in static or dynamic applications. Verify the serial number or application, then call (562) 693-7748. No catalog specifications or material qualifiers are provided for this item.

Part number variants: CR670748, cr670748