The Caterpillar 3J-7354 O-Ring is a high-integrity, high-durometer hydraulic boss seal. It is engineered to maintain exceptional pressure containment and prevent fluid leakage across straight-thread tube fittings, control valves, and high-pressure fluid passage connections subject to relentless machine vibrations and thermal cycling.
Material & Manufacturing Specs Material Grade: Premium high-density Nitrile / Buna-N (NBR) rubber elastomer. Coating & Finish: Specialized friction-reducing surface treatment or identification coating to minimize seal twisting, cutting, and extrusion during high-pressure installation. Sealing Type: High-integrity stationary static boss seal with superior resistance to compression set.
Equipment & System Compatibility This specialized hydraulic boss seal is standard heavy-duty hardware deployed across a vast selection of large-scale Caterpillar heavy machinery and high-horsepower engine platforms: Engine Platforms: Integrated into fuel injection manifolds, oil delivery lines, and cooling passage plugs for CAT 3406, 3408, 3412, C15, and C18 engine series. Hydraulic & Power Train Systems: Extensively used within hydraulic control valves, straight-thread O-ring boss (ORB) adapter fittings, pump interfaces, and transmission control valves across various CAT fleets. Large-Scale Equipment: Deployed in fluid circuit connectors, heavy accessory groups, and vital steering/braking control networks for Caterpillar mining trucks, wheel loaders, and track-type tractors.
Part Cross-References Alternative Part Names: Straight Thread O-Ring, Boss O-Ring, Hydraulic Fitting Seal. Alternative Part Numbers: 3J7354, 3J-7354, 185-1153.
