This workshop service repair manual covers Allis-Chalmers D14, D15, D15 Series II, D17, D17 Series III, and D17 Series IV tractors. These models, produced between 1957 and 1970, represent a significant era of American agricultural machinery, known for their robust construction and functional design. The D-Series tractors, powered by Allis-Chalmers Power-Crater engines in various gasoline and diesel configurations, were engineered for reliability and performance in demanding farm environments. This manual is an essential resource for maintaining these historically important machines. This comprehensive manual provides detailed information for the maintenance, repair, and overhaul of all covered tractor models, engines, trim levels, and transmission types. It includes extensive sections on the engine, fuel system, lubrication, cooling, ignition, and electrical systems, as well as the clutch, transmission, final drives, hydraulic system, brakes, front axle, steering, chassis, bodywork, and hitch system. With step-by-step instructions, detailed illustrations, troubleshooting guides, and technical specifications, this manual is designed to assist owners, mechanics, and technicians in keeping their Allis-Chalmers tractors in optimal working condition.