The David Brown 1390 tractor, produced from the mid-1970s into the early 1980s, represents a robust and reliable machine within the agricultural sector. As part of a line of tractors known for their strong build and dependability, the 1390 was manufactured in the United Kingdom and is characterized by its functional design and operational efficiency. This model is equipped with a diesel engine and a mechanical gearbox, often featuring multiple forward and reverse gears, alongside a standard power take-off (PTO). Its engineering prioritizes durability and performance for demanding agricultural tasks, making it a valued asset for owners and operators. This comprehensive factory service repair manual provides in-depth information for the service and repair of the David Brown 1390 tractor. It covers all essential systems, including engine overhaul, drivetrain, hydraulics, electrical systems, brakes, and steering. The manual details scheduled maintenance, component disassembly and assembly, troubleshooting guides, and critical technical specifications such as torque values and fluid capacities. Designed for owners, mechanics, and technicians, this manual offers factory-accurate data to facilitate efficient maintenance, accurate diagnostics, and cost-effective repairs, ensuring the longevity and optimal performance of the tractor.