This manual covers the Oliver 550 Tractor, a robust utility tractor produced during its original production era, typically from 1954 to 1958. Known for its versatility and reliable construction, the Oliver 550 was a staple in agricultural applications. This document provides factory-correct information essential for owners and operators to understand and maintain their equipment, ensuring continued performance and longevity. This comprehensive manual serves as an invaluable resource for owners, operators, mechanics, and restoration enthusiasts. It details ownership, operation, and maintenance procedures, including break-in, daily care, and minor adjustments. The manual extensively covers the tractor's various systems, such as the engine, fuel, ignition, electrical, cooling, clutch, transmission, differential, brakes, final drive, and steering. Numerous diagrams, illustrations, and charts are included to facilitate understanding of maintenance tasks and technical specifications, ensuring the Oliver 550 Tractor remains in optimal working condition.