The Allis-Chalmers WD45, produced from 1953 to 1957, stands as a testament to robust engineering and enduring utility. This versatile tractor, powered by a Continental Y-112 gasoline engine (with optional LPG or JD-302 Diesel variants) and featuring a 5-speed forward transmission, was designed for a wide range of agricultural and industrial tasks. Its approximately 45 PTO horsepower and substantial torque made it a capable workhorse, while its sturdy construction and reliable components solidified its reputation. The WD45 is widely recognized as a dependable utility tractor of its era, appreciated by owners, mechanics, and restoration enthusiasts for its straightforward design and operational efficiency. This comprehensive Workshop Service Manual provides in-depth guidance for all service and repair needs of the Allis-Chalmers WD45. It covers essential routine maintenance, detailed engine overhaul procedures, transmission service, hydraulic system maintenance, and electrical system diagnostics, including wiring diagrams. The manual is presented in English and includes step-by-step instructions, troubleshooting guides, and diagnostic procedures, all enhanced by pictures and diagrams. Its purpose is to empower owners and technicians to maintain, repair, and restore their WD45 tractors, saving money and ensuring continued reliable operation.