This workshop service manual provides comprehensive technical information for Zetor 5711 and 6711 tractors. These robust machines, originating from the well-established Czech Republic manufacturer Zetor, are known for their reliability and are designed for agricultural applications. The models, typically produced in the mid-to-late 20th century, offer a dependable solution for various farming tasks. This manual is an essential resource for understanding and maintaining these tractors, ensuring their continued efficient operation. This 120-page English workshop service manual is meticulously designed to guide mechanics and DIY tractor owners through every aspect of maintenance and repair. It covers all major systems, including the engine, transmission, hydraulic, electrical, brake, steering, cooling, fuel, axles, and power take-off. Detailed procedures for scheduled maintenance, troubleshooting common issues, component disassembly and assembly, adjustments, and installations are provided. The manual is rich with illustrations, exploded diagrams, and essential service data, including specifications and torque values, all presented to facilitate accurate and safe repair work.