The McCormick GX40, GX45, and GX50 tractors represent a line of reliable and durable compact utility vehicles, building on McCormick's extensive heritage in agricultural machinery. These diesel-powered tractors, with estimated horsepower ranging from approximately 40 to 50 HP, are designed for a variety of agricultural tasks. They feature robust engineering, typically equipped with manual synchromesh gearboxes, essential hydraulic systems for implement control, and often include Roll-Over Protective Structures (ROPS) for operator safety. The GX series embodies a commitment to functional design and operational efficiency, making them a valuable asset for owners, mechanics, and agricultural workshops. This comprehensive Workshop Service and Repair Manual provides detailed information for the McCormick GX40, GX45, and GX50 tractors. It covers essential areas including general information, engine overhaul and repair, clutch and gearbox service, power take-off (PTO) systems, hydraulic and steering system maintenance, brake system adjustments, and electrical system diagnostics with wiring diagrams. The manual's scope includes step-by-step procedures, troubleshooting guidance for common issues, scheduled maintenance schedules, and technical data, all presented with detailed exploded views. This resource is designed to empower owners and technicians to effectively maintain, diagnose, and repair these tractors, ensuring their continued performance and preserving investment value.