The David Brown 1390 is a robust agricultural tractor, produced likely in the late 1970s to early 1980s, representing a lineage of dependable British engineering. Known for their strong engines and solid construction, David Brown tractors of this era were designed for demanding farm work. The 1390, estimated to have a diesel engine displacement of around 3.5 to 4.0 liters and producing approximately 70-80 PTO horsepower, embodies this heritage. Its manual transmission, likely featuring multiple forward and reverse gears, coupled with a substantial operating weight, makes it a capable machine for a variety of agricultural tasks. This comprehensive factory service repair manual provides detailed information for the David Brown 1390. It covers essential areas including general information, technical specifications, engine, cooling system, fuel system, power train, clutch, transmission, front and rear axles, brakes, electrical system, and hydraulic system. The manual offers complete disassembly and reassembly instructions, standard maintenance procedures, and troubleshooting guidance, all presented with step-by-step instructions and hundreds of photos and illustrations. This resource is designed to assist both do-it-yourself owners and experienced mechanics in maintaining and repairing the vehicle effectively.