The Cockshutt 40 Tractor, produced primarily in the 1940s and 1950s, represents a robust piece of agricultural machinery from Cockshutt Farm Equipment Ltd. of Brantford, Ontario, Canada. Engineered for dependable performance, this tractor, often powered by a diesel engine in the 40-50 PTO horsepower range, was designed to meet the demanding needs of farming operations. Its construction emphasizes durability and straightforward functionality, making it a valuable asset for tasks requiring consistent power and reliability in the field. This comprehensive service repair manual provides detailed information for the Cockshutt 40 Tractor. It covers all major systems, including the engine, transmission, clutch, front and rear axles, brakes, electrical system, hydraulic system, and power take-off. The manual offers step-by-step procedures for maintenance, disassembly, assembly, repair, and adjustments, supported by troubleshooting guides, diagnostic charts, and technical specifications such as torque values and fluid capacities. This resource is intended to empower professional technicians and experienced DIY mechanics to effectively maintain and repair the tractor, ensuring its continued operational efficiency.