The Case IH 1255 and 1455 tractors, produced in the late 1980s and early 1990s, represent a robust lineage in agricultural machinery, building upon the legacy of International Harvester. These models are powered by a Case IH 6.6L 6-cylinder turbocharged diesel engine, offering approximately 125-155 PTO horsepower, designed for demanding farm work. Featuring advanced technology for their time, such as a 16-speed Powershift transmission with electro-hydraulic control for seamless gear changes, these tractors were engineered for reliability and efficiency. Their sturdy construction, including a ROPS-equipped operator station and hydraulically assisted wet disc brakes, underscores their commitment to performance and safety in agricultural operations. This comprehensive Parts & Complete Workshop Service Repair Manual in English provides essential information for owners, mechanics, and agricultural technicians. It covers all major systems, including detailed engine overhaul procedures, transmission diagnostics and repair, hydraulic system maintenance, and electrical system troubleshooting with wiring diagrams. The manual also details chassis, steering, and operator station components, along with routine maintenance schedules and repair instructions. With clear illustrations, exploded views for parts identification, and diagnostic charts, this manual is an indispensable resource for maintaining the operational integrity and longevity of your Case IH 1255 or 1455 tractor, enabling significant cost savings through effective self-service.