The Fendt Farmer 400 Vario Series, encompassing models such as the Fendt Farmer 409 Vario, 410 Vario, 411 Vario, and 412 Vario, represents a significant advancement in compact agricultural tractor technology. Primarily produced in the early to mid-2000s, this series is renowned for its robust engineering, exceptional reliability, and the integration of Fendt's pioneering Vario continuously variable transmission (CVT). This innovative transmission system offers seamless acceleration and deceleration, precise speed control, and optimized engine RPM management, contributing to enhanced operational efficiency and fuel economy. Built with Fendt's legacy of quality, these tractors are designed for demanding agricultural tasks, offering a blend of power, from approximately 80 HP to 120 HP, and sophisticated control systems that set them apart in their class. This comprehensive workshop service and repair manual provides detailed guidance for all Fendt Farmer 400 Vario models. It covers a wide array of systems, including engine overhaul, fuel and lubrication systems, Vario transmission diagnostics and repair, drivetrain, hydraulic systems, electrical schematics, braking, and steering. The manual offers step-by-step instructions for routine maintenance, such as oil and filter changes, as well as in-depth procedures for component disassembly, repair, and reassembly. Troubleshooting guides, diagnostic trees, and information on special tooling are also included, making this manual an indispensable resource for farm owners, independent mechanics, and agricultural service centers. Its clear, easy-to-follow instructions and diagrams empower users to perform maintenance and repairs effectively, ensuring the longevity and optimal performance of their Fendt tractors.