The Polaris Sportsman 400 HO, produced for the 2008, 2009, and 2010 model years, is a capable mid-size utility ATV designed for recreational riders and light farm or ranch work. This model is recognized for its balanced performance, featuring a 375cc liquid-cooled engine, Variable Transmission (PVT) with engine braking, and an On-Demand All-Wheel Drive (AWD) system with VersaTrac Turf Mode. Its engineering emphasizes a durable steel frame and an ergonomic rider position, making it suitable for trail riding and general utility tasks. The Sportsman line is known for its comfort and reliability, positioning the 400 HO as a strong contender in its segment against competitors like Yamaha, Suzuki, Honda, and Can-Am. This factory service repair workshop manual provides comprehensive guidance for the maintenance and repair of the Polaris Sportsman 400 HO. It covers all essential systems, including complete engine service, automatic transmission (PVT) repair, drivetrain components, suspension, steering, brakes, and electrical systems. The manual details routine and scheduled maintenance, diagnostic procedures for troubleshooting issues, and step-by-step repair and overhaul instructions for major components. Technical specifications, such as torque values, fluid capacities, and electrical data, are also included. This resource is intended for professional technicians, experienced DIY mechanics, and ATV enthusiasts seeking to maintain and repair their vehicles effectively. 🏷️ Basic Information Identification Make: Polaris Model: Sportsman 400 HO Model Variant: HO (High Output) Applicable Years: 2008, 2009, 2010 Codes Manual Product Id: N/A (Provided as a download PDF) 👋 Introduction Market Position Category: Mid-size Utility ATV Target User: Recreational riders, light farm/ranch work, trail riding. Competitive Analysis Competitors: Yamaha Grizzly 350/450, Suzuki KingQuad 400, Honda Rancher 400/420, Can-Am Outlander 400. Key Features Powertrain: 4-stroke, liquid-cooled engine, Polaris Variable Transmission (PVT) with engine braking. Suspension Type: Independent Front Suspension (IFS), MacPherson Strut Rear Suspension. Drivetrain Features: On-Demand All-Wheel Drive (AWD) with VersaTrac Turf Mode. Chassis Design: Durable steel frame, ergonomic rider position. 📋 Manual Details Coverage Areas Engine: Complete Engine Service and Repair Transmission: Automatic Transmission (PVT) Service and Repair Drivetrain: AWD/2WD System, Final Drives, Driveshafts Suspension: Front and Rear Suspension, Shocks, Control Arms Steering: Steering System, Tie Rods, Handlebars Brakes: Hydraulic Brake System, Calipers, Lines, Master Cylinders Electrical: Wiring Diagrams, Charging System, Ignition, Lighting, Starters Fuel System: Fuel Delivery, Carburetor, Fuel Pump, Filters Cooling System: Radiator, Coolant, Water Pump Exhaust System: Muffler, Pipes, Heat Shields Body And Frame: Body Panels, Frame Inspection, Plastics Troubleshooting: Diagnostic Procedures and Fault Finding Page Count Estimated Pages: Likely 300-600+ pages (typical for factory service manuals) Manual Type Type: Factory Service Repair Workshop Manual Language Primary Language: English Format File Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine Systems: Engine disassembly, assembly, valve adjustments, piston/cylinder inspection, lubrication system, timing, component specifications. Transmission Systems: PVT (Polaris Variable Transmission) operation, belt inspection/replacement, clutch service, gearbox lubrication and repair. Drivetrain Systems: Front and rear differential service, driveshaft maintenance, AWD engagement system troubleshooting, U-joint inspection. Braking Systems: Brake fluid specifications, bleeding procedures, caliper overhaul, rotor inspection, brake line routing. Electrical Systems: Detailed wiring diagrams, charging system testing (stator, regulator/rectifier), ignition coil and spark plug diagnosis, starter motor testing, lighting circuit troubleshooting. Suspension Steering Systems: Shock absorber adjustments and replacement, control arm bushing inspection, wheel bearing service, steering post and linkage maintenance. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, air filter cleaning/replacement, lubrication points, chain/belt tensioning. Scheduled Maintenance: Specific mile/hour-based service intervals for all major components. Diagnostic Procedures: Step-by-step troubleshooting guides for common and uncommon issues based on symptoms. Repair Procedures: Detailed instructions for component removal, overhaul, and reinstallation. Overhaul Procedures: Complete rebuild instructions for engine, transmission, and differentials. Technical Specifications: Torque values, clearances, fluid capacities, electrical specifications, diagnostic trouble codes (DTCs). Technical Depth Depth: Comprehensive; covers everything from basic rider maintenance to full engine and transmission rebuilds. Target Audience: Professional technicians, experienced DIY mechanics, and serious ATV enthusiasts. 📊 Manual Specifications File Format Searchability: Likely text-searchable PDF for efficient information retrieval. Print Quality Image Resolution: High-resolution images and diagrams suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: 4-stroke, SOHC, 2-valve, Single Cylinder Displacement: 375cc Bore X Stroke: 84.0 mm x 68.0 mm Cooling System: Liquid-Cooled Fuel Delivery: Carburetor (Mikuni VM34SS typically) Ignition System: Electronic Ignition Exhaust System: Single muffler with catalytic converter (check emissions standards for specific years). Performance Horsepower: Approx. 24 HP @ 6500 RPM (Subject to variation by year/tuning) Torque: Approx. 23 lb-ft @ 4500 RPM (Subject to variation) Fuel System Fuel Type: Unleaded Gasoline (87 Octane Minimum) Fuel Tank Capacity: 3.0 gal (11.4 L) 🔧 Transmission Standard Type: Polaris Variable Transmission (PVT) Automatic with Engine Braking Gear Selection: High, Low, Neutral, Reverse, Park Features Drive Modes: 2WD / AWD (On-Demand) Fluid Specifications Transmission Fluid Type: Polaris AGL Premium Gearcase Lubricant or equivalent (e.g., SAE 80W-90 Hypoid...