This manual covers the 616, 620, and 720 tractor models. These machines were produced by a historic American manufacturer, which likely represent a range of utility or compact tractors. These tractors are known for their engineering quality and reliability, offering robust performance for various agricultural and industrial tasks. The manual provides complete information for repair, learning, and field work, ensuring operators can maximize the utility and longevity of their equipment. This comprehensive factory service repair manual is designed to assist technicians, mechanics, and tractor owners. It covers essential areas including complete engine overhaul, transmission service, brake system diagnosis, electrical system troubleshooting, and maintenance of cooling, fuel, steering, suspension, and axle systems. Additionally, it details chassis and body information, emission controls, HVAC systems, and interior components. The manual includes general maintenance procedures, troubleshooting guides, lubrication charts, assembly and disassembly instructions, and calibration adjustments, all presented in English.