The International Harvester 766 is a robust tractor, part of IH's renowned agricultural machinery lineup, generally produced between 1969 and 1975. Known for its strong engineering and reliability, this model was designed to meet the demanding needs of the agricultural sector. While specific engine horsepower and torque figures vary by configuration, the 766 series typically featured diesel engines and offered options such as the PowerShift transmission, reflecting the practical technology of its time. Its heritage as a product of International Harvester signifies a commitment to durable and dependable performance in field operations. This comprehensive factory service repair manual provides in-depth information for the International Harvester 766 tractor, covering all styles and essential systems. It details procedures for engine, lubrication, cooling, fuel, clutch, transmission, drive chain, rear axle, brakes, front axle, steering, shocks, body work, intake/exhaust, hydraulics, and electrical systems. The manual includes routine maintenance, advanced troubleshooting, disassembly, general repair, separation, rebuild, refurbishment, and restoration procedures, along with wiring diagrams. With step-by-step instructions, detailed illustrations, and diagrams, this manual is an indispensable resource for owners and technicians seeking to maintain and repair their equipment, offering factory-level detail to ensure optimal performance and longevity.