The Allis-Chalmers 190 and 190XT tractors represent robust agricultural machinery with a history of durability and performance. These models are recognized for their engineering quality within the agricultural sector, designed for demanding tasks and built to last. This manual covers the repair and overhaul of these specific tractor models, providing essential information for maintaining their operational integrity and longevity. This workshop service manual offers comprehensive guidance for mechanical technicians and tractor owners. It details engine overhaul, transmission repair, electrical system diagnosis, and bodywork maintenance, along with routine servicing and troubleshooting procedures. The manual includes special tool references, safety warnings, and specifications comparable to those used by authorized dealer service departments, empowering users to perform professional-level repairs and maintenance.