The 2008 Sportsman 300 and 400 H.O. represent capable mid-size utility all-terrain vehicles, renowned for their versatility and reliability in various off-road applications. These models feature a liquid-cooled, 4-stroke engine, available in 299cc and 375cc (marketed as 400cc) displacements, paired with an Automatic Variable Transmission (PVT) and On-Demand All-Wheel Drive (AWD) system for optimal traction. The engineering emphasizes a smooth ride and robust performance, supported by Independent Front and Rear Suspension (IRS) and a substantial 11.5 inches of ground clearance, making them well-suited for demanding terrain and utility tasks, including a 1500 lb towing capacity. This comprehensive workshop service and repair manual provides essential information for maintaining and repairing your 2008 Sportsman 300 or 400 H.O. ATV. It covers routine maintenance procedures, detailed engine overhaul, fuel and ignition system servicing, drivetrain and suspension repairs, brake system maintenance, and electrical system diagnostics. The manual includes troubleshooting guidance, technical specifications, torque values, and critical clearances, along with high-resolution illustrations and wiring diagrams, empowering owners and technicians to keep their vehicles in optimal operating condition. 🏷️ Basic Information Identification Make: Polaris Model: Sportsman 300/400 H.O. Year: 2008 Product Type: Workshop Service Repair Manual Format: PDF Download 👋 Introduction Market Position Market Segment: Mid-size utility ATV segment, known for versatility and reliability. Competitive Analysis Key Competitors: Competed with models like the Honda Rancher, Yamaha Wolverine, and Suzuki KingQuad in its class. Key Features Atv Powertrain Options: Available in 300cc and 400cc H.O. (High Output) engine variants. Drivetrain: Features Polaris's On-Demand All-Wheel Drive (AWD) system for superior traction. Suspension: Independent Front and Rear Suspension (IRS) for a smoother ride and better ground clearance. 📋 Manual Details Coverage Areas Coverage: Comprehensive repair, maintenance, and troubleshooting for 2008 Polaris Sportsman 300 and Sportsman 400 H.O. ATVs. Page Count Page Count: Estimated 400-600 pages (typical for this type of comprehensive manual) Manual Type Manual Type: Workshop Service and Repair Manual Language Language: English Format Details File Format: PDF 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly for both 300 and 400 H.O. models. Fuel System: Carburetor (for 300) and Electronic Fuel Injection (EFI) system (for 400 H.O.), fuel pump, fuel filter, fuel lines, and tank. Ignition System: Ignition timing, spark plugs, ignition coil, CDI unit, stator, and wiring diagrams. Cooling System: Radiator, fan, water pump, thermostat, coolant hoses, and coolant specifications. Exhaust System: Exhaust pipe, muffler, heat shields, and gasket replacement. Drivetrain Transmission: Automatic transmission (PVT - Polaris Variable Transmission), clutch system (primary and secondary), drive belt inspection and replacement, gear case, and differential. Drivetrain Axles: Front and rear drive shafts, CV joints, axle boots, and hub assembly. Suspension Front: A-arm design, shocks, springs, bushings, wheel bearings, and steering components. Suspension Rear: Independent Rear Suspension (IRS) details, shocks, springs, bushings, and trailing arm components. Brakes Front: Hydraulic disc brakes, brake calipers, master cylinder, brake lines, pads, and rotors. Brakes Rear: Hydraulic disc brake system, parking brake mechanism. Steering System: Handlebars, steering column, tie rods, steering rack, and adjustment procedures. Electrical System: Battery, charging system (stator, regulator/rectifier), starter motor, lighting (headlights, taillights, brake lights), indicators, and electrical switches. Wiring Diagrams: Detailed, color-coded wiring diagrams for all electrical circuits. Bodywork Chassis: Frame inspection, plastic body panels, fenders, racks, seat, and mounting hardware. Procedures Included Routine Maintenance: Oil change, filter replacement, spark plug replacement, air filter cleaning/replacement, chain adjustment (if applicable), and general inspection checks. Troubleshooting: Systematic diagnostic procedures for common and uncommon issues, fault code interpretation (if applicable for EFI). Engine Repair: Top-end rebuild (cylinder, piston, rings), valve adjustment, camshaft service, crankshaft inspection. Transmission Repair: PVT belt replacement, clutch service and adjustment, gear case seal replacement. Brake Service: Brake pad replacement, brake fluid flush and bleed, caliper rebuild. Suspension Service: Shock absorber replacement, bushing replacement, wheel bearing replacement. Steering Adjustment: Tie rod adjustment, steering wheel alignment. Electrical Diagnostics: Testing charging system output, starter motor operation, lighting circuits, and switch functionality. Efi Troubleshooting: Diagnosing fuel pump issues, injector problems, sensor faults, and ECM related problems for the 400 H.O. Technical Depth Depth Of Coverage: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including in-depth diagnostics and component specifications. Diagnostic Codes: Includes information on reading and interpreting diagnostic trouble codes (DTCs) for EFI models. Torque Specifications: Detailed torque values for all critical fasteners and bolts. Clearances Tolerances: Specifications for critical component clearances and wear tolerances (e.g., piston-to-cylinder, valve clearances). 📊 Manual Specifications File Format File Format: Portable Document Format (PDF) Print Quality Print Quality: High-resolution, clear text and images suitable for printing. Binding Type Binding Type: N/A (Digital Download - PDF) Paper Type Paper Type: N/A (Digital Download - PDF) Searchability Searchable Text: Likely includes searchable text for quick information retrieval. Illustrations Illustration Quality: Detailed, step-by-step illustrations and diagrams. ⚙️ Engine Specifications Primary Engine 300 Engine Type 300: Liquid-cooled, 4-stroke, SOHC, 2-valve Displacement 300:...