The Polaris 400 4x4 is an all-terrain vehicle (ATV) designed for recreational riders, farmers, hunters, and general utility users requiring robust four-wheel-drive capability. Produced for the 1994 and 1995 model years, this mid-size utility ATV features a 398cc liquid-cooled 2-stroke engine, a variable transmission with high/low range, independent front suspension, and hydraulic disc brakes. Its engineering prioritizes reliability and performance in challenging off-road conditions, making it a capable choice for various tasks and terrains. This comprehensive workshop service manual provides detailed repair and maintenance guidance for the Polaris 400 4x4 models from 1994 and 1995. It covers all major systems, including the engine, fuel, cooling, ignition, drive, drivetrain, suspension, brakes, steering, and electrical systems. The manual includes step-by-step repair instructions, overhaul procedures, diagnostic charts for troubleshooting, and essential technical specifications such as torque values and clearances. Its purpose is to assist professional mechanics, technicians, and advanced DIY enthusiasts in maintaining and repairing the vehicle to ensure optimal performance and longevity.