The International Harvester 674 is a robust agricultural tractor, produced approximately from the mid-1970s to the early 1980s. Known for its reliability and versatility, this model was a significant part of International Harvester's successful range of medium-duty tractors. Engineered for demanding farm work, the 674 features a diesel engine, typically a 3- or 4-cylinder International Harvester D-Series, providing ample power for various agricultural tasks. Its design emphasizes durability and straightforward operation, making it a dependable workhorse for farmers and agricultural professionals. This comprehensive workshop service and repair manual provides detailed information for the International Harvester 674 tractor. It covers essential areas including complete service, repair, maintenance, diagnostics, and overhaul procedures for all major systems such as the engine, transmission, hydraulics, electrical components, and chassis. The manual includes step-by-step instructions, periodic maintenance charts, troubleshooting guides, and technical specifications, making it an invaluable resource for professional technicians and owners alike to ensure the optimal performance and longevity of their tractor.