The Case David Brown 990 Tractor, a robust agricultural machine originating from the United Kingdom, was produced from the late 1950s through the 1970s. Designed as a versatile, medium-horsepower tractor, it served a variety of farming operations. While specific production years and detailed features may vary across its lifespan, the 990 is recognized for its functional design and reliable performance in agricultural settings. Its engineering focuses on practical application, providing the power and utility necessary for field work and other farm-related tasks. This comprehensive workshop service repair manual in English provides detailed information for the service, repair, and maintenance of the Case David Brown 990 Tractor. It covers essential systems including the engine, drivetrain, hydraulics, electrical components, and braking systems, offering step-by-step repair instructions, diagnostic guidance, and troubleshooting procedures. The manual is intended for independent service professionals, farm owners with mechanical aptitude, and anyone seeking to understand and maintain their tractor. It includes technical specifications, maintenance schedules, fluid recommendations, and insights into common wear items, empowering users to perform effective upkeep and repairs.