The Allis-Chalmers WD45 Tractor, produced from 1953 to 1957, represents a significant advancement in agricultural machinery, building upon its predecessor with increased engine power and improved hydraulics. This robust tractor, available with either gasoline or diesel engine options from the \"G\" Series, was designed for demanding farm work and is recognized as a workhorse of its era. Its engineering prioritizes reliability and utility, offering substantial PTO horsepower and a versatile 5-speed forward and 1-reverse transmission. The WD45’s durable construction and practical design made it a staple on farms, embodying the quality and innovation associated with Allis-Chalmers Manufacturing Company. This comprehensive Service Repair Manual provides factory-level repair and maintenance procedures for the Allis-Chalmers WD45 Tractor. It is an essential reference for professional technicians and experienced DIY mechanics, offering detailed step-by-step instructions for overhauling, troubleshooting, and repairing all major systems, including the engine, fuel, ignition, cooling, lubrication, transmission, hydraulic, electrical, braking, and steering systems. The manual covers scheduled maintenance, disassembly, assembly, cleaning, repair, and adjustments, ensuring owners and technicians have the knowledge to maintain the tractor’s performance and longevity. With its thorough coverage and clear guidance, this manual is designed to facilitate accurate and efficient service.