This manual covers the CASE I.H. (David Brown) 1690 tractor, a robust agricultural machine produced during the late 1970s and 1980s. Known for its reliability and solid engineering heritage from David Brown, further enhanced by Case's market presence, the 1690 was positioned as a capable utility or row-crop tractor. This model benefits from the synergy of David Brown's established manufacturing and Case's agricultural technology. The manual is designed to provide comprehensive factory-level information, ensuring the proper function and longevity of your tractor. The purpose of this Factory Service Repair Workshop Manual is to equip owners and technicians with the detailed knowledge required for all aspects of maintenance, troubleshooting, and repair. It covers all systems, including the engine, transmission, hydraulics, electrical system, drivetrain, chassis, steering, braking, PTO, cooling, fuel, and lubrication systems, as well as bodywork and the operator station. With step-by-step instructions, exploded views, and detailed diagrams, this manual facilitates complete disassembly and reassembly, offering a cost-effective alternative to professional service and ensuring your CASE I.H. 1690 tractor remains in optimal working condition.