Polaris Sportsman 300 & 400 HO Service & Repair Manual 2009 (P/N 9921818)

• Covers 2009 Polaris Sportsman 300 and 400 H.O. ATV variants, including models A09LH27AX, A09LH27AZ, A09LH46AQ, A09LH46AX, and A09LH46AZ
• Official 292-page Polaris OEM publication (P/N 9921818, 9921822, 9921819, and 9921823) detailing the 2009 model-year service procedures
• Contains 161 technical specification tables, engine exploded-view diagrams, and detailed torque-sequence charts for both the 300 and 400 H.O. engines
• Remains the authoritative reference for the 300 cc air-cooled and 455 cc liquid-cooled powertrain configurations

Engine Service and Component Documentation

The service manual provides a structured look at internal engine assemblies for the 2009 Polaris Sportsman 300 and 400 H.O. Coverage spans top-end overhaul procedures, detailing valve clearance adjustments, cylinder head reconditioning, and camshaft timing. Mechanics will find comprehensive sections documenting the crankshaft, starting clutch assemblies, and oil pump systems. Exploded views for the ES300PFE and EH460PLE engine platforms offer clear visual references for complex tear-downs.

Additional chapters break down the maintenance of the liquid-cooling circuits, CVT transmission tuning, and chassis components like steering geometry and suspension preload. Working on these heavy-duty powertrain configurations requires strict adherence to factory torque specifications to prevent catastrophic mechanical failure or personal injury. Proper safety gear and standard shop protocols are essential during all testing and diagnostic routines.

Specification Highlights and Technical Reference

Accurate technical data is critical for shop floors and advanced DIY rebuilds. The documentation includes comprehensive torque tables covering bolt sizes from #10 to 1/2-inch alongside metric hardware. Engine data provides exact reference values for bore and stroke, compression ratios (9.2:1 for the 300; 10.1:1 for the 400 H.O.), and idle speed RPM settings. Electrical specifications detail alternator output at 250 watts and outline spark plug gap requirements.

Cylinder compression for the 300 is documented at 120–140 psi. The 400 H.O. is listed at 50–90 psi. Transmission capacity for both models stands at 20.3 oz. (592 ml) of AGL fluid. Intake valve clearance is tightly specified at 0.15 mm.