This Service Repair Manual provides comprehensive information for the CASE 540 Series Tractor. CASE, a manufacturer with a long heritage in agricultural and construction equipment, produced the 540 Series tractors, likely during the late 1970s through the 1980s and possibly into the early 1990s. These tractors are known for their robust build and utility in agricultural applications, typically featuring naturally aspirated diesel engines in inline 3 or 4-cylinder configurations, producing between 40-70 HP. They were designed for reliable performance in demanding field operations, with a focus on essential mechanical and hydraulic functionality rather than advanced technology. This manual serves as an essential resource for owners, mechanics, and technicians, offering factory-level technical data for maintaining, diagnosing, and repairing the CASE 540 Series Tractor. It covers all major systems, including detailed engine service, transmission repair, hydraulic system maintenance, electrical diagnostics, power take-off (PTO) service, steering, and braking systems. The manual includes routine maintenance procedures, troubleshooting guides for common and uncommon faults, engine and transmission overhaul instructions, and information on specialized tools. Its extensive coverage ensures that users can effectively manage the upkeep and repair of their equipment.