The David Brown 1390 Tractor represents a robust and reliable piece of agricultural machinery, produced likely between the late 1970s and early 1980s. As part of the David Brown 100/1200 series, this mid-range utility tractor was engineered with a focus on durability and performance, featuring a typically 4-cylinder diesel engine with approximately 70-75 PTO horsepower. Its design emphasizes mechanical functionality, with a 12-speed constant mesh gearbox and a dual-stage clutch for transmission and PTO engagement. The tractor's sturdy build, with an operating weight around 6,000-7,000 lbs, makes it suitable for a wide range of farm operations, reflecting the quality and engineering heritage of David Brown Tractors Ltd. This Factory Service Repair Manual provides comprehensive information for the service and repair of the David Brown 1390 Tractor. It covers essential maintenance procedures, including routine and preventative tasks, alongside detailed troubleshooting guides for diagnosing and resolving mechanical, hydraulic, and electrical issues. The manual offers in-depth repair instructions and overhaul procedures for major components such as the engine, transmission, and hydraulic system, as well as specific guidance on adjustments and torque specifications. This resource is invaluable for farm owners, mechanics, and technicians seeking to maintain optimal performance, extend the lifespan, and reduce repair costs for their David Brown 1390 Tractor.