The International Harvester 1086 Tractor, produced from approximately 1976 to 1981, represents a significant advancement in agricultural machinery, building upon the legacy of International Harvester's robust and reliable equipment. This model was part of the successful '86' series, designed to offer enhanced operator comfort and improved technology for demanding farm operations. Known for its powerful diesel engine, typically a 6-cylinder around 436 cu. in. (7.15L), and its versatile transmission options including a 16-speed manual or an optional Power-Shift, the 1086 was engineered for durability and performance. Its substantial operating weight and strong torque output made it a capable workhorse for a wide range of agricultural tasks. This comprehensive service and repair manual provides essential information for maintaining and troubleshooting the International Harvester 1086 Tractor. It covers a broad spectrum of technical details, including in-depth procedures for engine overhaul, transmission service, brake system repair, and electrical system diagnostics. The manual also details maintenance schedules, lubrication requirements, and offers guidance on common issues such as potential transmission wear or hydraulic system concerns. Designed for owners and technicians alike, this resource aims to empower users with the knowledge needed to ensure the longevity and optimal performance of their tractor through detailed instructions and clear explanations.