The McCormick XTX Series Tractors, encompassing models XTX185, XTX200, and XTX215, represent robust heavy-duty agricultural machinery designed for demanding farm operations. These tractors, produced primarily in the mid-to-late 2000s and early 2010s, build upon McCormick's historic legacy in agricultural engineering. They are characterized by their powerful Cummins diesel engines, typically around 8.3 liters and delivering between 185 to 215 horsepower, coupled with advanced powershift transmissions. Engineered for reliability and performance, the XTX series is intended for farm owners, agricultural contractors, and experienced mechanics who require dependable power and advanced features for efficient fieldwork. This workshop service repair manual provides comprehensive coverage for the McCormick XTX Series Tractors, offering detailed guidance for service and repair operations. It is designed to assist owners and technicians in maintaining optimal tractor performance and addressing potential issues. The manual covers all essential systems, including detailed diagnostics and repair procedures for the engine, transmission, hydraulic system, electrical system, powertrain components, operator station, cooling system, and fuel system. Furthermore, it includes systematic troubleshooting guides, step-by-step repair instructions, and essential technical specifications, ensuring that users have the necessary information to perform scheduled maintenance, complex repairs, and in-depth diagnostics.