This factory service repair manual covers the Allis-Chalmers 210 and 220 models, representing robust agricultural machinery from the late 1960s to the 1970s. Allis-Chalmers was a prominent American manufacturer known for its durable construction and reliable performance. These tractors were engineered for demanding tasks, offering solid performance in their class. This manual provides comprehensive details to ensure these machines continue to operate optimally. This manual serves as an essential resource for owners, technicians, and mechanics, offering detailed service, repair, and maintenance procedures. It includes in-depth coverage of all major systems, including the engine, fuel, cooling, ignition, lubrication, transmission, clutch, drive axles, steering, brake, electrical, and hydraulic systems. Additionally, it provides step-by-step instructions for component disassembly and assembly, overhaul procedures, adjustments, replacement, and critical torque specifications, along with troubleshooting charts and wiring diagrams. The manual's factory-originated data ensures unparalleled accuracy and detail for effective maintenance and repair.