The Case IH JX90 Tractor, produced primarily in the mid-2000s through the early 2010s, is a versatile utility tractor designed for a wide range of agricultural and operational tasks. Built with a philosophy of robustness and reliability, the JX90 emphasizes ease of maintenance and dependable performance, making it a competitive option within its market segment. It commonly features a 4-cylinder turbocharged diesel engine, offering approximately 88-92 PTO horsepower, and is available with either a synchronized shuttle transmission or an optional powershift transmission, providing flexibility for various operational demands. Its design prioritizes operator efficiency and durability, reflecting Case IH's established heritage in agricultural machinery. This comprehensive workshop service manual provides detailed information for the repair and maintenance of the Case IH JX90 Tractor. It covers essential systems including the powertrain, hydraulics, chassis, steering, braking, and electrical systems, along with the operator station. Within its extensive pages, users will find procedures for regular maintenance, component disassembly and reassembly, troubleshooting guides with fault-finding charts, and critical technical specifications such as torque values and fluid capacities. This manual is intended to assist owners, mechanics, and technicians in effectively maintaining, diagnosing, and repairing the JX90, ensuring its continued optimal performance and longevity.