The International Harvester 966 tractor, produced approximately between 1971 and 1976, represents a significant contribution to agricultural machinery from a renowned manufacturer. As part of the highly successful 66 series, it succeeded earlier models and became known for its robust construction, reliable performance, and operator comfort, setting a benchmark for its time. This tractor was engineered for demanding tasks, offering substantial power and durability suitable for a wide range of farming operations. Its design emphasized productivity and longevity, making it a valued asset for farmers and agricultural professionals. This comprehensive Service Repair Manual provides in-depth information for the International Harvester 966 tractor. It covers essential maintenance procedures, detailed repair instructions, and diagnostic guidance for all major systems, including the engine, transmission, drivetrain, hydraulics, electrical, braking, and steering. The manual also includes technical specifications, troubleshooting charts, and clear illustrations to assist owners, mechanics, and technicians. Its purpose is to empower users to maintain their tractor effectively, perform necessary repairs, and ensure optimal performance and longevity, thereby saving on service costs.