The Allis-Chalmers 190 tractor, produced approximately between 1964 and 1969, represents a robust and versatile machine from a significant era of American agricultural equipment manufacturing. This model was designed to be a dependable workhorse, capable of handling a wide range of farming tasks with its estimated 60-70 PTO horsepower and various engine options, likely including diesel variants such as the D-179. Known for its reliability and solid engineering, the 190 contributed to Allis-Chalmers' strong market position by offering practical functionality and longevity for its owners. Its design focused on mechanical efficiency, making it a valuable asset for operations requiring consistent performance and durability. This Workshop Service Manual (WSM) in English provides comprehensive guidance for the Allis-Chalmers 190 tractor. It covers essential maintenance procedures, including routine servicing and fluid specifications, as well as detailed troubleshooting and repair instructions for all major systems such as the engine, fuel, cooling, electrical, transmission, and hydraulics. The manual includes in-depth diagnostic guides, step-by-step repair procedures, overhaul instructions, and adjustment specifications, supported by numerous illustrations and wiring diagrams. Its purpose is to empower owners, mechanics, and technicians with the knowledge to efficiently maintain, diagnose, and repair the tractor, ensuring optimal performance and extending its operational life.