This comprehensive International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86 Tractor Service Repair Workshop Manual provides detailed information for all repairs, servicing, and troubleshooting procedures. It's a valuable resource for both professional mechanics and technicians as well as DIY enthusiasts. The manual contains hundreds of pages with detailed photographs and diagrams that guide you through every step of each repair or maintenance task. This manual is designed to help you understand the intricacies of your tractor, enabling you to perform repairs and maintenance with confidence.

The International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86 tractors were a line of versatile and powerful agricultural machines manufactured by International Harvester (IH) during the latter half of the 20th century. These tractors were known for their robust construction, reliable performance, and wide range of applications. They were popular choices for farmers and ranchers involved in various agricultural tasks, including plowing, discing, harvesting, and transporting goods. These tractors were equipped with powerful diesel engines, providing ample torque and horsepower for demanding agricultural work. The International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86 tractors featured a variety of transmission options, including manual, synchronized, and hydrostatic transmissions. The hydrostatic models, such as the Hydro 70 and Hydro 86, offered smooth and responsive control, making them ideal for operations requiring precise maneuvering. These tractors were also available with various hydraulic systems, providing the power to operate implements and attachments. The International Harvester Series 544, 656, 666, 686, Hydro 70, and Hydro 86 tractors have become a staple in the history of agriculture, contributing significantly to the development of farming practices and the efficiency of agricultural operations.