The International Harvester 786 Tractor represents a robust piece of agricultural machinery, produced from approximately 1976 to 1981. As part of the esteemed 86 series, it succeeded earlier models with updated styling and enhanced features, building on International Harvester's legacy of producing reliable and durable equipment. These tractors, often equipped with powerful diesel engines such as the DT-466B or DT-402, and typically featuring an 8-speed syncro-mesh transmission with an optional Power-Shift, were designed for demanding farm work. Their engineering quality and inherent reliability made them a valuable asset for farmers and operators requiring dependable performance. This comprehensive factory service repair manual provides essential information for the maintenance, repair, and troubleshooting of the International Harvester 786 Tractor. It covers a wide array of systems, including the engine, transmission, hydraulics, electrical system, PTO, chassis, steering, brakes, fuel, and cooling systems, as well as the operator station. Detailed procedures for routine maintenance, engine overhaul, transmission repair, hydraulic system servicing, electrical diagnosis, component removal and installation, and adjustments are included. The manual also offers critical technical specifications, torque values, wiring diagrams, and hydraulic schematics, making it an indispensable resource for owners and technicians aiming to preserve the longevity and optimal performance of their tractor.