This workshop service manual covers the Allis-Chalmers 8010, 8030, 8050, and 8070 tractor models, produced primarily in the late 1970s and early 1980s. These tractors, built in the United States, represented advancements in design and technology for their time, often featuring turbocharged diesel engines and robust construction. They were engineered for reliability and performance in agricultural and industrial applications, with various transmission options including manual powershift and fully synchronized gearboxes, alongside robust hydraulic and PTO systems. The 8000 series was well-regarded for its build quality and operational capabilities within its class. This comprehensive manual provides in-depth, professional-quality, step-by-step instructions for all services and repairs, including routine maintenance, component rebuilds, and complex diagnostics. It covers all major systems such as the engine, transmission, hydraulic system, electrical system, steering, brakes, fuel, cooling, exhaust, and operator station. Detailed troubleshooting guides, wiring diagrams, and illustrations are included to assist owners and technicians. The purpose of this manual is to empower users with the knowledge and procedures necessary to maintain and repair their Allis-Chalmers tractors, enabling cost savings and ensuring optimal performance.