The International Harvester 1086 is a robust agricultural tractor produced approximately between 1976 and 1981. This model represents a significant advancement in IH's tractor lineup, known for its power, versatility, and improved operator comfort compared to earlier designs. Equipped with an International Harvester DT-436 turbocharged diesel engine, it delivered substantial performance for demanding farm tasks. Its engineering prioritizes reliability and efficiency, making it a capable workhorse in various agricultural applications. The 1086's design and features positioned it as a competitive option in the agricultural machinery market of its era. This comprehensive service repair manual provides extensive coverage for the International Harvester 1086, focusing on repair and maintenance. It details procedures for the engine, transmission, hydraulic system, electrical system, drivetrain, braking system, steering, cooling system, fuel system, body, and operator controls. The manual includes step-by-step instructions for disassembly, assembly, cleaning, reinstallation, adjustments, and troubleshooting, along with torque specifications and detailed diagrams. Its purpose is to equip professional technicians and advanced DIY mechanics with the factory-level knowledge necessary for accurate and efficient servicing, ensuring the longevity and optimal performance of the tractor.