This workshop service manual covers Zetor tractor models 8011, 8045, 12011, and 12045, produced primarily from the 1970s into the 1980s. These medium-duty agricultural tractors are recognized for their robust construction, straightforward mechanical design, and versatility, making them well-suited for demanding farm work. Built by a manufacturer with a long heritage in agricultural machinery, these Zetor models were designed for durability and ease of maintenance, offering reliable performance in various operational environments. This comprehensive manual provides detailed information for assembly, disassembly, and repair of all major tractor systems. Coverage includes the engine, transmission, drivetrain, hydraulic system, electrical system, braking system, steering, cooling, and fuel systems. It offers step-by-step repair instructions, diagnostic guides for troubleshooting common issues, and essential technical specifications such as torque values and fluid capacities. This resource is intended to assist owners, mechanics, and technicians in maintaining and repairing these Zetor tractors effectively.