This workshop service manual provides comprehensive guidance for the 2009 Arctic Cat 700 H1 Thundercat, a utility all-terrain vehicle designed for work, recreation, hunting, and trail riding. Built upon the robust H1 Engine Platform, this model features a liquid-cooled, SOHC, 4-stroke, 4-valve engine, electronic fuel injection, and a selectable 2WD/4WD drivetrain with a front differential lock. Its independent front and rear suspension, combined with hydraulic disc brakes, offers capable performance. The 700 H1 Thundercat is recognized for its power and utility, positioning it competitively within the ATV market. This manual serves as an essential resource for mechanical technicians and experienced DIY mechanics, covering all aspects of mechanical and electrical repair and maintenance. It includes detailed procedures for routine maintenance, engine and transmission overhauls, and advanced diagnostics for all major systems such as the engine, fuel system, cooling, drivetrain, suspension, steering, braking, and electrical components. With step-by-step troubleshooting guides, precise torque specifications, fluid requirements, and clear diagrams, this English-language workshop manual empowers users to effectively maintain, diagnose, and repair their 2009 Arctic Cat 700 H1 Thundercat.