This workshop service repair manual covers the International Harvester 684 Tractor, produced from the mid-1970s to the early 1980s. Renowned for their durability and robust construction, International Harvester tractors have a significant legacy in the agricultural industry. The 684 model is a key part of this heritage, offering reliable performance in the medium-horsepower utility tractor segment. This manual provides comprehensive factory-level service and repair information, including detailed substeps, notes, cautions, and warnings, to help you understand and maintain your tractor effectively. This manual is designed for both do-it-yourself owners and experienced mechanics, offering hundreds of pages of essential information. It covers all major systems, including the engine, lubrication, cooling, fuel, clutch, transmission, drive train, rear and front axles, brakes, steering, suspension, bodywork, intake and exhaust, and hydraulic and electrical systems. Detailed procedures for disassembly, servicing, routine maintenance, and advanced troubleshooting are provided, along with wiring diagrams and part identification illustrations. The manual's extensive coverage ensures you have the resources needed for effective maintenance and repair.