The Allis-Chalmers 7020 Tractor, produced in the late 1970s and early 1980s, represents a robust and capable machine from a manufacturer renowned for its durable agricultural equipment. This model, part of the advanced 7000 series, offered significant improvements in power, comfort, and functionality, making it a reliable choice for farm owners, mechanics, and agricultural service centers. Its design emphasizes strong low-end torque for heavy draft work and features like hydrostatic power steering and a synchro-range transmission for efficient operation. The 7020 embodies the heritage of Allis-Chalmers' commitment to providing powerful and dependable tractors for demanding agricultural tasks. This comprehensive factory service repair manual provides essential information for the maintenance, troubleshooting, and repair of the Allis-Chalmers 7020 Tractor. It covers all major systems, including the engine, fuel, cooling, lubrication, transmission, hydraulic, powertrain, electrical, steering, braking, chassis, operator station, and hitch. Detailed procedures for scheduled maintenance, diagnostics, adjustments, and overhauls are included, alongside wiring diagrams and technical specifications such as torque values and fluid requirements. This manual is an indispensable resource for owners and technicians aiming to ensure the longevity and optimal performance of their 7020 tractor, offering factory-level insights to facilitate cost-effective service and repair.