The David Brown 1594 is a robust agricultural tractor, part of the esteemed '90' series produced in Meltham, England, from the mid-1970s to the early 1980s. Known for their durability and operational efficiency, David Brown tractors have a strong legacy in agricultural machinery. The 1594, typically powered by a 6-cylinder diesel engine around 5.9L and offering approximately 90-100 PTO horsepower, is designed for heavy draft work and general farm operations. Its engineering emphasizes reliability, featuring a Synchromesh gearbox, a dual-clutch with live PTO, and substantial torque delivery, making it a dependable workhorse for farm owners and agricultural businesses. This service and repair manual provides comprehensive coverage for all services and repairs, including routine maintenance, for the David Brown 1594. It details procedures for the engine, transmission, hydraulics, electrical systems, braking, steering, cooling, and fuel systems. With easy-to-follow, step-by-step instructions, troubleshooting guides, advanced diagnostics, and complete rebuild procedures for major components, this manual is an essential resource. It includes pictures and wiring diagrams, enabling farm owners, mechanics, and agricultural repair businesses to perform DIY repairs, maintain the vehicle effectively, and save on mechanic costs, offering a complete alternative to limited factory documentation.