This comprehensive workshop service repair manual covers the Steyr 9105a, 9115a, 9125a, and 9145a tractor models. Steyr, a manufacturer with a rich heritage in agricultural machinery, is known for its robust and reliable tractors designed for diverse farming applications. These models represent a lineage of dependable equipment, built with engineering quality to meet the demanding needs of agricultural work. This manual provides the essential technical data and procedures required to maintain and repair these powerful machines, ensuring their continued performance and longevity in the field. The purpose of this manual is to serve as an exhaustive resource for technicians, mechanics, and tractor owners. It details a wide array of systems and procedures, including engine service and repair, transmission maintenance, brake system overhauls, electrical system diagnostics, suspension and steering adjustments, cooling and fuel system servicing, and much more. With extensive coverage of general maintenance, troubleshooting, repair procedures, circuit diagrams, and safety guidelines, this manual empowers users to perform all necessary upkeep and repairs efficiently. It is designed to provide clear, actionable information, enabling users to understand, maintain, and repair their Steyr tractors effectively.