This factory service repair manual provides comprehensive information for the International Harvester 856 series tractors, typically produced from the mid-1960s to the early 1970s. Known for their durability and reliability in agricultural applications, these tractors offered robust performance with options for diesel and LP-Gas engines, manual transmissions, and the versatile Torque Amplifier system. This manual is designed to cover all styles of the IH International Harvester 856 Tractor, reflecting the engineering quality and intended use of these workhorses. The purpose of this manual is to serve as an authoritative resource for owners, mechanics, and technicians. It details a wide array of systems, including the engine, transmission, hydraulic system, electrical system, brakes, and more, with specific procedures for overhaul, repair, and maintenance. With factory-level detail, numerous illustrations, and clear, numbered instructions, this manual equips users with the knowledge to perform diagnostics, tune-ups, and extensive rebuilds, ensuring the continued optimal performance and longevity of the International Harvester 856 tractor.