This manual covers a comprehensive range of Case IH tractors, including models 743, 745, 844, 845, 743XL, 745XL, 844XL, 845XL, 856XL, 956, 956XL, 1056, and 1056XL. These tractors, primarily produced from the late 1970s through the early 1990s, represent a lineage of robust and reliable agricultural machinery with a heritage rooted in International Harvester. They are known for their durability and powerful performance, designed to be dependable workhorses in various farming applications. The manual addresses a wide array of engine variants, including D-155 through D-358 and their turbocharged DT counterparts, ensuring detailed coverage for the diverse powerplants equipped in these models. The purpose of this Factory Service Repair Manual is to provide detailed technical information for the maintenance, diagnosis, and repair of the specified Case IH tractor models. It encompasses extensive coverage of all major systems, including engines, fuel systems, electrical components, steering, power train, and hydraulics. Users will find step-by-step instructions for routine maintenance, troubleshooting common issues, and complete overhaul procedures, supported by essential technical data such as torque specifications and fluid capacities. This manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance, longevity, and proper upkeep of their Case IH tractors.