The Case IH STX Series tractors, encompassing models STX275 through STX450, represent robust, high-horsepower agricultural machines designed for large-scale operations. Known for their articulated steering, these tractors offer enhanced maneuverability in demanding field conditions. Engineered with powerful Cummins turbocharged and intercooled diesel engines, they provide a range of horsepower options to tackle heavy draft work and extensive tillage. The STX Series is built upon Case IH's long heritage in agricultural innovation, emphasizing reliability and operator comfort for extended working periods, making them a staple in commercial farming and large agricultural enterprises. This comprehensive service manual provides detailed information for the maintenance and repair of the Case IH STX Series tractors. It covers essential areas including powertrain, chassis, hydraulic, and electrical systems, offering in-depth procedures for preventive maintenance, troubleshooting, major repairs, and component replacement. The manual also includes technical specifications, diagnostic guidance, and information on special tools, ensuring that owners, mechanics, and technicians have the necessary resources to maintain optimal performance and longevity of these powerful agricultural machines.