The David Brown 1390 Tractor represents a significant offering from a manufacturer renowned for its robust and reliable agricultural machinery. As a diesel-powered, 4-cylinder tractor, the 1390 is engineered for demanding work, likely producing approximately 70-80 horsepower, making it a capable machine for various agricultural tasks. Its heritage is rooted in a lineage of well-regarded tractors, built during an era when David Brown was a prominent name in the industry. This model embodies the brand's commitment to durable engineering, designed to provide dependable performance and longevity in the field. This workshop service manual provides comprehensive guidance for the repair and maintenance of the David Brown 1390 Tractor. It covers a wide array of systems, including detailed procedures for the engine, transmission, hydraulics, electrical system, axles, steering, brakes, power take-off, cooling, and fuel systems. The manual offers step-by-step instructions for disassembly, assembly, adjustments, troubleshooting, and component testing, supported by diagrams, photos, and factory specifications. It is an essential resource for mechanics and DIY individuals aiming to ensure the reliability and extend the operational life of their tractor.