The Zetor 8011, 8045, 12011, and 12045 series tractors represent a lineage of robust and reliable agricultural machinery from Czechoslovakia. These tractors, likely produced from the late 1970s through the 1980s and into the early 1990s, were engineered for demanding farm work, offering powerful diesel engines typically ranging from approximately 80 to 120 horsepower. Known for their solid construction and straightforward functionality, Zetor tractors of this era are recognized for their dependability in challenging environments. This manual covers models equipped with various configurations, including 4WD variants, and features designed for efficient power take-off and hydraulic operations, reflecting Zetor's commitment to practical and durable agricultural solutions. This comprehensive service repair manual provides detailed information essential for the maintenance and repair of your Zetor 8011/8045/12011/12045 tractor. It covers all major systems, including the engine, transmission, hydraulics, electrical systems, chassis, and body. Within its pages, you will find step-by-step procedures for scheduled maintenance, troubleshooting common issues, and complete overhaul instructions for key components. The manual is designed to assist professional technicians and experienced DIY mechanics in performing accurate diagnostics, ensuring proper upkeep, and executing repairs effectively, thereby maximizing the longevity and performance of your tractor.