The Allis-Chalmers CA tractor, produced from 1948 to 1957, represents a significant piece of agricultural engineering. This versatile tractor, manufactured in West Allis, Wisconsin, was designed for a wide range of farm tasks, embodying the reliability and robust construction characteristic of its era. Its inline 4-cylinder, L-head engine, with a displacement of 201.2 cubic inches, provided dependable power for its intended applications. The CA tractor featured a 4-speed forward and 1-reverse transmission, a dry single-plate clutch, and a basic yet functional operator control layout, making it a workhorse for farmers during its production run. This comprehensive Factory Service Repair Manual is designed to be an indispensable resource for maintaining and repairing the Allis-Chalmers CA tractor. It covers essential service and repair procedures, including detailed information on the engine, fuel system, cooling system, ignition system, electrical system, transmission, rear axle, PTO, hydraulic system, steering, brakes, chassis, and front axle. The manual provides step-by-step repair instructions, troubleshooting guides, diagnostic techniques, adjustment procedures, and detailed wiring diagrams. It also includes scheduled maintenance information, fluid specifications, and highlights common wear points and potential issues, empowering owners and technicians to keep their CA tractor in optimal working condition.