The David Brown 1390 represents a robust and capable tractor, a testament to the engineering quality and reliability David Brown was known for. Produced likely in the late 1970s and early 1980s, this model was a significant part of the '13' Series, offering substantial power and performance for its class. Its design emphasizes durability and practical functionality, making it a valuable asset for agricultural and industrial tasks. The 1390 is characterized by its strong construction and a focus on mechanical integrity, embodying the legacy of a respected manufacturer. This comprehensive workshop service manual is your essential resource for the maintenance, repair, and overhaul of your David Brown 1390 tractor. Covering a wide array of systems including the engine, fuel, cooling, lubrication, transmission, hydraulics, electrical, braking, and steering, this manual provides detailed, step-by-step instructions. It includes routine maintenance schedules, advanced troubleshooting guidance, full overhaul procedures, and detailed wiring diagrams, all written with the accuracy and clarity expected from original manufacturer-level information. This manual is designed to empower both professional technicians and advanced DIY mechanics to keep their David Brown 1390 operating at peak performance, ensuring longevity and minimizing downtime.