This factory service repair manual covers the Polaris Sportsman 400 HO, a versatile utility All-Terrain Vehicle produced for the 2008, 2009, and 2010 model years. Renowned for its capability and comfort, the Sportsman 400 HO features a robust 375cc liquid-cooled engine paired with Automatic PVT transmission and on-demand All-Wheel Drive. Its independent front and rear suspension systems, along with substantial front and rear cargo rack capacities, make it an ideal choice for outdoor enthusiasts, hunters, farmers, and recreational riders seeking reliable performance in various terrains. The engineering quality and practical design of the Sportsman line have established the brand as a leader in the powersports industry. This comprehensive manual provides essential information for maintaining and repairing your Polaris Sportsman 400 HO. It details routine maintenance procedures, including oil changes and filter replacements, as well as in-depth coverage of all major systems. Topics include complete engine overhaul, fuel system service, ignition system troubleshooting, cooling system maintenance, transmission and drivetrain repair, chassis and suspension adjustments, brake system service, and electrical system diagnostics. With step-by-step instructions, troubleshooting guides, and critical specifications, this manual is an indispensable resource for both owners performing DIY maintenance and professional technicians ensuring optimal vehicle performance and longevity. 🏷️ Basic Information Identification Make: Polaris Model: Sportsman 400 HO Model Designation: 400 High Output Product Type: Factory Service Repair Manual Codes Manual Product Code: Not Specified in Product Information 👋 Introduction Market Position Vehicle Segment: Utility ATV (All-Terrain Vehicle) Target Audience: Outdoor enthusiasts, hunters, farmers, trail riders, and recreational users. Competitive Analysis Key Competitors: Can-Am Outlander 400, Yamaha Grizzly 400, Honda Rancher 400. Key Features Powertrain Configuration: Proven single-cylinder engine with automatic PVT transmission and selectable 2WD/AWD. Suspension Design: Independent front suspension and progressive-rate fully-independent rear suspension (IRS) for rider comfort and capability. Utility Features: Front and rear cargo racks with substantial weight capacities, tow hitch. Manual Purpose Manual Value Proposition: Empowers owners and technicians with the official, detailed knowledge required for accurate maintenance and repair, ensuring vehicle longevity and performance. 📋 Manual Details Coverage Areas Covered Years: 2008, 2009, 2010 Covered Models: Polaris Sportsman 400 HO Page Count Page Count: Not Specified in Product Information Manual Type Manual Type: Factory Service Repair Manual Language Language: English (Assumed based on typical product offerings for this market) Format Format: Digital (Likely PDF, based on typical online sales of service manuals) 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly procedures. Fuel System: Carburetor tuning, cleaning, and replacement; fuel pump and filter service. Ignition System: Spark plug service, ignition coil testing, CDI unit troubleshooting. Cooling System: Radiator service, fan operation, coolant specifications and bleeding procedures. Transmission And Drivetrain: PVT (Polaris Variable Transmission) operation, belt inspection and replacement, clutch service, AWD system troubleshooting and repair. Chassis And Suspension: Front and rear suspension component inspection, adjustment, and replacement (shocks, control arms, bushings). Brakes: Brake caliper service, hydraulic system bleeding, pad and rotor replacement. Electrical System: Wiring diagrams, starter, alternator, battery, lighting, and accessory circuits. Bodywork And Plastics: Panel removal and installation, fender, rack, and seat service. Procedures Included Routine Maintenance: Oil changes, filter replacements, air filter cleaning/replacement, spark plug checks, lubrication points. Troubleshooting Guides: Systematic diagnostic procedures for common and uncommon performance issues. Component Replacement: Step-by-step instructions for replacing major and minor components. Specifications And Tolerances: Torque values, clearances, and critical measurements for all systems. Special Tool Requirements: Identification and usage of specialized tools for specific repair procedures. Technical Depth Depth Of Coverage: Comprehensive, covering routine maintenance to complete engine and transmission rebuilds. Diagnostic Capabilities: Detailed troubleshooting flowcharts and symptom-based diagnostics. Repair Complexity: Suitable for both amateur DIY mechanics and professional technicians. 📊 Manual Specifications File Format Digital Format: PDF (Portable Document Format) - typical for digital service manuals. Searchability: Likely text-searchable if properly indexed PDF. Print Quality Illustrations: High-quality diagrams, exploded views, and photographs (typical for factory manuals). Binding Type Binding: Not applicable for digital format; if printed, would be spiral-bound or perfect-bound for workshop use. Paper Type Paper Quality: Not applicable for digital format; if printed, would typically be on durable, coated paper suitable for workshop environments. ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, liquid-cooled, SOHC, single-cylinder Engine Displacement: 375 cc (Note: Often referred to as 400 HO due to marketing/performance, but the actual displacement is 375cc) Bore X Stroke: Not Specified in Product Information (but detailed in manual) Compression Ratio: Not Specified in Product Information (but detailed in manual) Performance Horsepower: Approx. 26 hp (Estimate based on typical 375cc engines of the era; manual will have precise figure) Torque: Not Specified in Product Information (but detailed in manual) Fuel System Fuel Delivery: Carburetor (likely Mikuni or Keihin) - Specific model detailed in manual. Fuel Type: Unleaded gasoline Fuel Capacity: 3.0 gal (11.4 L) (Estimated, check manual for exact figure) Lubrication Oil Type: API SG or...