This service repair manual covers the Fiat Trattori 680 and 680DT models, likely produced between the 1970s and 1980s. These tractors, representing Fiat's robust agricultural machinery heritage, are known for their reliability and are designed for demanding farm work. The 680 is the two-wheel-drive variant, while the 680DT offers four-wheel-drive capability, both powered by capable diesel engines. This manual provides essential information for owners and technicians to understand, maintain, and repair these workhorses, ensuring their continued performance and longevity in various agricultural applications. The purpose of this comprehensive English-language service manual is to provide detailed guidance on all aspects of repair, maintenance, troubleshooting, and servicing for the Fiat Trattori 680 / 680DT. It covers a wide range of systems including the engine, transmission, brakes, electrical system, cooling, fuel, and chassis. The manual includes procedures for disassembly, reassembly, repair, diagnostics, and adjustments, along with essential technical specifications and wiring diagrams. This resource is invaluable for anyone needing to perform general maintenance, in-depth repairs, or complex diagnostics, enabling efficient upkeep and problem resolution for the tractor.