The Valtra Valmet 8400 is a robust tractor, part of the established Valmet 8000 series, produced from the mid-1990s to the early 2000s. Engineered for demanding agricultural applications, this heavy-duty machine is recognized for its durability and performance. Its design emphasizes reliability, making it a dependable workhorse for various farm operations. The Valtra Valmet 8400 represents a significant step in agricultural machinery, offering a blend of power and operational efficiency. This workshop service repair manual provides comprehensive factory-level information for the Valtra Valmet 8400 Tractor. It covers all essential aspects, including detailed maintenance procedures, in-depth troubleshooting guides with electrical wiring diagrams, and step-by-step repair instructions for complete disassembly and reassembly of all systems. With hundreds of pages, detailed illustrations, and clear guidance, this manual is an indispensable resource for owners and mechanics aiming to maintain and repair the tractor effectively, ensuring its longevity and optimal performance.