The David Brown 1690 is a robust agricultural tractor produced from the late 1970s into the 1980s, a period when David Brown Tractors Ltd. was renowned for its dependable and powerful machinery. Building upon earlier designs, the 1690 incorporated improved features and significant power output, typically featuring a diesel engine with a displacement of approximately 5.8 liters. Its engineering emphasizes durability and heavy-duty performance, making it a capable workhorse for demanding agricultural tasks. The tractor is equipped with a David Brown 8-speed constant mesh gearbox, often with a high-low range, a standard rear Power Take-Off (PTO), and a rear differential lock for enhanced traction, reflecting its focus on practical functionality and reliability. This comprehensive full service repair manual for the David Brown 1690 provides extensive coverage for repair, maintenance, rebuild, refurbish, restoration, and diagnostics. It includes detailed information on all major systems, such as the engine, transmission, hydraulic system, electrical system, braking system, and steering. The manual offers step-by-step instructions for routine maintenance, component replacement, and complex rebuilding procedures, alongside crucial troubleshooting guides and wiring diagrams. Designed for both professional technicians and experienced DIY mechanics, this manual aims to ensure the longevity and optimal performance of your David Brown 1690 by offering detailed procedures, accurate specifications, and essential maintenance schedules.