The International Harvester 1456 is a robust mid-size utility and row-crop tractor, produced from the mid to late 1960s through the 1970s. Known for its powerful International Harvester diesel engines, including the D-239, DT-239, D-282, and DT-282 variants, and available transmission options like the Hydro-Trans and manual Power-Shift, this model offered significant versatility for its era. It featured a capable IH hydraulic system, designed with operator productivity in mind, and competed effectively with other major manufacturers of the time. The 1456 represented an advancement in tractor technology, embodying International Harvester's reputation for durable and reliable agricultural machinery. This comprehensive factory service repair manual provides detailed information for the International Harvester 1456. It covers a wide array of systems, including engine diagnostics and overhaul for multiple diesel engine variants, transmission repair for both Hydro-Trans and Power-Shift models, and in-depth guidance on the hydraulic system. The manual also details procedures for the electrical system, power take-off, axles, steering, brakes, cooling, fuel, frame, and operator's station. Included are essential maintenance schedules, troubleshooting guides, disassembly and assembly instructions, torque specifications, and special tool requirements, enabling owners and technicians to maintain and repair the tractor effectively.