This comprehensive workshop service repair manual provides detailed instructions and illustrations for servicing and repairing International Harvester tractors, specifically the Series 544, 656, 666, 686, Hydro 70, and Hydro 86 models. This manual covers all aspects of maintenance and repair, from basic troubleshooting to complex engine and transmission overhauls. With its clear and concise language, accompanied by numerous diagrams and photographs, this manual makes even the most challenging repair tasks manageable. It is an invaluable resource for both professional mechanics and DIY enthusiasts, enabling them to confidently perform repairs and keep their tractors running smoothly.

The International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86 tractors represent a diverse range of agricultural machines, each tailored to specific tasks and needs. These models were known for their robust construction, reliable performance, and versatility, making them popular choices among farmers and ranchers. The Series 544, a compact and maneuverable unit, was ideal for smaller farms and gardens. The 656, 666, and 686 models offered increased horsepower and capabilities for heavier-duty tasks like plowing, cultivating, and harvesting. The Hydro 70 and Hydro 86, equipped with hydrostatic transmissions, provided smooth and responsive control, making them suitable for a wide range of applications. Each model within this series was equipped with a range of engine options, including diesel and gasoline powerplants, providing flexibility for different fuel preferences and operating environments. The tractors also featured various transmission types, from manual to hydrostatic, allowing users to choose the best option for their specific requirements. The International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86, though diverse in their capabilities, shared a reputation for durability and dependability, making them valuable assets on farms and ranches for generations. The workshop manual, designed to comprehensively guide repairs and maintenance, ensured these tractors stayed in top working order for years to come.