This manual covers the 850 HO and Sportsman Touring 850 HO models, including their EPS variants, produced for the 2012 and 2013 model years. These versatile all-terrain vehicles are powered by the ProStar 850 EFI engine, a 4-stroke twin-cylinder liquid-cooled unit renowned for its robust performance, delivering approximately 77 horsepower and 57 lb-ft of torque. Engineered for off-road capability and rider comfort, the Sportsman line is recognized for its reliability and advanced features such as Electronic Power Steering (EPS) on equipped models, a Variable Transmission (PVT) with engine braking, and a durable chassis with ample ground clearance. This comprehensive guide is designed for owners and technicians seeking detailed information on maintaining and repairing these capable powersports machines. The purpose of this service repair workshop manual is to provide in-depth, factory-level guidance for the complete maintenance, servicing, and repair of your 850 HO / EPS. It encompasses all major systems, including the Electronic Fuel Injection (EFI), cooling, engine, transmission, clutch, final drive, body, steering, suspension, brakes, and electrical systems. With hundreds of detailed illustrations and photos, this manual offers step-by-step instructions for disassembly, reassembly, component testing, and troubleshooting, covering everything from routine maintenance like oil changes to complex engine overhauls and electrical diagnostics. This resource empowers owners and professional mechanics alike to ensure the optimal performance, longevity, and safe operation of their vehicle.