This manual covers the Case IH 235, 235H, 245, 255, 265, and 275 series tractors, representing a range of utility and row-crop agricultural machinery. These tractors, likely produced during the 1980s and 1990s, were designed with a philosophy of reliability, durability, and ease of maintenance for demanding agricultural environments. Built under the Case IH brand, which carries a rich heritage from the merger of J.I. Case Company and International Harvester's agricultural division, these models feature robust mechanical, electrical, and hydraulic systems. They are powered by naturally aspirated diesel engines and equipped with various transmission types, including manual sliding gear, constant mesh, synchromesh, and hydrostatic options, catering to diverse operational needs. This comprehensive Service Repair Workshop Manual provides expert-level technical information essential for the upkeep and repair of these Case IH tractors. It details all major mechanical, electrical, and hydraulic systems, including the engine, drivetrain, steering, brake, and PTO systems. The manual offers step-by-step instructions for scheduled maintenance, component removal, disassembly, repair, reassembly, and installation, alongside detailed troubleshooting guides and diagnostic procedures. With searchable text, clear illustrations, and diagnostic charts, this manual is an indispensable resource for owners, operators, and maintenance personnel aiming to maximize the lifespan and performance of their equipment.