This manual covers the International Harvester 424 and 444 tractors, renowned for their durability and effectiveness in agricultural and industrial applications. International Harvester has a long legacy of producing robust equipment, and these tractor models likely represent a significant part of that heritage. Designed for versatile utility, the 424 and 444 series are built to handle a wide range of tasks, embodying the engineering quality and reliability expected from the brand. This comprehensive factory service repair manual provides in-depth information to ensure these tractors continue to perform optimally. The purpose of this manual is to serve as a complete guide for the maintenance, repair, and restoration of the International Harvester 424 and 444 tractors. It contains factory-level technical information, including detailed step-by-step instructions, troubleshooting guides, diagnostic procedures, and comprehensive coverage of all major systems such as the engine, transmission, hydraulic system, and electrical system. With hundreds of pages, including illustrations and wiring diagrams, this manual is an essential resource for owners, mechanics, and technicians aiming to maintain these tractors with factory-trained precision and to avoid costly shop labor.