The Deutz Agrotron MK3 Series tractors, encompassing models 80, 85, 90, 100, and 105, represent a significant evolution in agricultural machinery. Manufactured by Deutz-Fahr, a German company with a rich heritage in agricultural equipment, these tractors are engineered for performance and reliability. The MK3 generation likely incorporates advancements in engine management, transmission technology, and hydraulic systems, offering power outputs ranging from approximately 80 to 105 horsepower. These tractors are designed to meet the demanding needs of modern farming operations, providing robust solutions for a variety of tasks. This comprehensive factory service repair manual provides detailed information for the Deutz Agrotron MK3 Series tractors. It covers all essential systems, including the engine, cooling, fuel, power train, front and rear axles, clutch, differential lock, electrical system, brakes, and hydraulic system. The manual includes step-by-step repair instructions, disassembly and reassembly procedures, component overhaul guidance, and troubleshooting diagnostics for all major components. With hundreds of pages of factory-level detail, this resource is invaluable for owners, operators, and professional mechanics seeking to maintain, diagnose, and repair these agricultural machines effectively.