This manual provides comprehensive service and repair information for the 2007 400TRV, an all-terrain vehicle designed for off-road utility and recreational riding. An established American manufacturer, has a history of producing capable powersports vehicles. The 400TRV is known for its versatility and off-road performance, featuring a liquid-cooled, 4-stroke, SOHC engine with approximately 375cc to 400cc displacement, delivering an estimated 25-30 horsepower. Its automatic Continuously Variable Transmission (CVT) includes high range, low range, and reverse drive modes, offering engine braking on deceleration. The vehicle is built on a steel frame and equipped with hydraulic disc brakes for reliable stopping power. This factory service manual is presented in English and covers the automatic transmission system in detail. It includes essential maintenance procedures such as fluid level checks, fluid and filter changes, and drive belt inspections. Diagnostic procedures for troubleshooting common transmission faults, symptom analysis, and electrical system diagnostics are also provided. Repair procedures cover transmission removal and installation, clutch inspection and replacement, gearset repair, and seal replacement. The manual's comprehensive scope empowers owners and technicians with factory-level knowledge to maintain and repair the vehicle, ensuring optimal performance and longevity.