The Allis-Chalmers D19 and D-19 series tractors, produced in the late 1950s and early 1960s, represent a significant era in American agricultural machinery. These robust tractors were engineered for versatility and power, available in multiple configurations including LP-Gas, Gasoline, and Turbo-Charged Diesel engine options, as well as Single Wheel Tricycle, Dual Wheel Tricycle, and adjustable axle versions. Known for their reliability and solid construction, they were a staple on farms and are now sought after by collectors and restoration enthusiasts. This manual covers a wide range of these models, providing essential technical data and procedural guidance to maintain their operational capability and preserve their value. This comprehensive shop service and repair manual offers detailed instructions for the maintenance and servicing of the Allis-Chalmers D19 and D-19 Diesel tractors. It covers all major systems, including engine (diesel and non-diesel variants), cooling, fuel, ignition, clutch, transmission, differential, brakes, steering, and hydraulic systems. The manual provides step-by-step repair procedures, tune-up guidelines, lubrication schedules, fluid specifications, and troubleshooting advice for common issues. With abundant illustrations, exploded diagrams, and essential technical data such as torque specifications, this resource is invaluable for farm owners, mechanics, and agricultural repair shops seeking to keep their vintage Allis-Chalmers tractors in optimal working condition.