This manual covers the David Brown 780 Tractor, a versatile and reliable machine produced approximately between 1965 and 1970. Known for its robust engineering and suitability for agricultural and utility tasks, the 780 Tractor represents a significant part of David Brown's heritage in agricultural machinery manufacturing. This workshop service manual is designed to provide comprehensive information for maintaining and repairing this esteemed model, ensuring its continued performance and longevity. The purpose of this comprehensive 93-page workshop service manual is to offer detailed guidance for mechanics and DIY enthusiasts. It covers all essential systems, including the engine, transmission, drivetrain, hydraulic system, electrical system, brakes, steering, cooling, fuel, chassis, and bodywork. Procedures for maintenance, troubleshooting, repair, disassembly, assembly, adjustment, installation, testing, and specifications are thoroughly explained with clear language and supporting illustrations. Safety precautions are integrated throughout, highlighting critical DANGER, CAUTION, and NOTE remarks to ensure safe operation and prevent damage.