RING - BACK UP (CAT CT19370C39)

A worn backup ring can allow seal extrusion under pressure, leading to fluid leaks and reduced system efficiency. This aftermarket replacement part references CAT as the OE maker and cross-references part number CT19370C39. The ring functions as a rigid support that prevents the seal from deforming into the clearance gap. In high-pressure applications, a failed backup ring often causes sudden seal blowout and contamination ingress. Keeping this component in sound condition helps maintain proper sealing force over the service interval. Verify the serial number or application, then call (562) 693-7748.

Part number variants: CT19370C39, ct19370c39