The International Harvester (IH) 1206 Tractor, produced from approximately 1963 to 1967, represents a significant advancement in agricultural machinery of its era. This robust machine, built in Rock Island, Illinois, is renowned for its strong frame, powerful IH diesel engines featuring 7-bearing crankshafts, and the pioneering use of an 8-speed, on-the-go Power-Shift transmission. Designed as a versatile agricultural tractor, the 1206 bridged the gap between utility and row-crop models, offering approximately 73 HP at the drawbar and 82 HP at the PTO. Its innovative design and performance made it a highly regarded and top-performing tractor in its class, celebrated for its durability and advanced transmission technology. This comprehensive Factory Service Repair Manual provides in-depth technical information for the International Harvester 1206 Tractor. It covers all essential systems, including detailed procedures for the IH D-361 and D-354 diesel engines, the 8-speed Power-Shift transmission, and the IH Traction-Control hydraulic system. The manual also details service for the electrical, steering, braking, front and rear axles, cooling, and fuel systems, as well as the PTO and three-point hitch. Owners and technicians will find extensive guidance on scheduled maintenance, troubleshooting, repair, overhaul, and critical technical specifications, ensuring the optimal performance and longevity of the 1206 Tractor.