Caterpillar Incorporated 5J-8225 U-Cup Rod Seal

CAT 5J-8225 U-Cup Rod Seal is Caterpillar's genuine replacement seal for hydraulic cylinders, designed as the primary rod seal in Cat IT-series machines such as IT12B, IT14B, IT14F, IT14G, IT18, and IT62G. The U-cup geometry provides a robust, lip-style seal that encases the cylinder rod during extension and retraction, helping to prevent fluid leakage and shield the internal hydraulic system from dust and contaminants. This part's footprint aligns with standard Cat cylinder configurations—commonly listed as 2-1/4 x 2-3/4 x 3/8 inches (rod diameter x bore x cross-section)—supporting straightforward replacement with OEM components. As a Caterpillar component, 5J-8225 is intended to meet Cat sealing performance expectations for medium- to heavy-duty hydraulic applications in IT-series equipment, offering predictable wear characteristics and compatibility with the referenced machine models. The seal is typically used in cylinders where a U-cup style rod seal is specified to maintain hydraulic pressure while allowing smooth rod movement under demanding operating conditions.