2003 Polaris Sportsman 500 6x6 ATV Service Manual (P/N 9918067)

This Polaris service manual covers the 2003 Sportsman 500 6x6 utility ATV, model A03CL50AA, with the EH50PLE10 engine. Publication P/N 9918067 documents maintenance, diagnosis, engine disassembly, and chassis repair.

• Engine repair: Engine removal, cylinder-head disassembly, valve-seat reconditioning, piston and crankshaft inspection, camshaft timing, and bottom-end assembly.

• Cooling and lubrication: Cooling-system pressure testing and bleeding, oil-pressure checks, oil-pump priming, and water-pump mechanical seal replacement.

• Fuel and carburetion: Mikuni BST 34 carburetor disassembly and assembly, float adjustment, needle-and-seat leakage testing, and fuel-pump service.

• PVT and transmission: Clutch overhaul, bushing replacement, belt and alignment adjustments, gear-selector service, and internal transmission disassembly and assembly.

• AWD final drive: Hilliard roller-clutch service, front drive axle and CV boot replacement, front gearcase repair, and middle/rear axle bearing service.

• Steering and brakes: MacPherson strut cartridge and ball-joint replacement, concentric swingarm service, caliper repair, and dual hydraulic caliper bleeding.

• Electrical diagnostics: Full-vehicle wiring diagram (PDF p. 247), ignition and charging flowcharts, starter testing, instrument-cluster diagnosis, and Electronic Throttle Control tests.

Suited to experienced workshop technicians equipped for precision measurement and component overhaul; the PVT section specifically requires Polaris MSD training and factory-authorized tools.

Operational and Maintenance Documentation

The periodic maintenance schedule, pre-ride inspection protocols, and lubrication charts cover chassis fittings, drive-chain adjustment, and transmission shift-linkage inspection. Fluid-capacity references accompany the engine, coolant, transmission, and front gearcase service information.

General workshop references include decimal equivalent charts, tap drill charts, and unit-of-measure conversion tables.

Engine and Cooling System Repair

Cylinder-head work extends to valve-guide replacement and valve-seat contact checks. Bottom-end procedures cover crankcase separation, bearing inspection, and crankshaft and counterbalancer end-play adjustment.

Cylinder-head torque sequences and the EH50PL oil-flow diagram support reassembly and lubrication diagnosis. Component torque references include the crankshaft slotted nut and cylinder base bolts.

Cooling coverage includes system routing, radiator-cap testing, and thermostat operating specifications. The water-pump mechanical seal can be replaced with the engine installed using puller P/N 2872105; crankshaft, counterbalancer, and oil-pump service require engine removal.

The seal-puller procedure warns that side loading can bend the water-pump shaft, turning an in-frame seal job into engine removal and crankcase separation.

Carburetor, Clutch, and Drivetrain Service

Altitude jetting and clutch calibration charts relate carburetor and PVT setup to operating conditions. The fuel section explains vacuum-slide operation and diaphragm inspection, with separate fuel-pump testing procedures.

PVT service details spider, roller, and bushing inspection, plus belt deflection, clutch offset, and center-distance checks. Transmission coverage extends to gears, engagement dogs, shift forks, and the selector assembly; front gearcase procedures include ring-and-pinion inspection and seal installation.

The AWD section warns that an armature plate displaced from the Hilliard roller cage can damage the roller clutch when the vehicle is driven.

Steering, Suspension, and Hydraulic Brakes

Steering and swingarm illustrations show tie-rod orientation and pivot-bushing placement. The dual hydraulic rear-caliper cutaway distinguishes its separate fluid circuits and bleed points, with inspection and reassembly procedures for both front and rear calipers.

Follow the manual's lifting and support precautions during axle, strut, and brake work.

Electrical Fault Isolation

Instrument-cluster flowcharts distinguish electrical AWD-control faults from hub-mechanism problems, helping direct diagnosis before front-hub disassembly. Coverage also includes wheel-speed sensor tests and gear-position switch checks.

Ignition information includes stator-plate timing adjustment and a typical ignition timing curve. Peak-voltage tests, charging-system checks, and starter voltage-drop diagnosis extend the electrical coverage beyond component replacement.

Examples of Valve, Cooling, and Charging Data

These are a few of the engine, cooling, and electrical specifications included in the manual.

For the EH50PLE10 engine, intake and exhaust valve clearance is 0.006 in. (0.15 mm), checked cold at TDC on the compression stroke. Radiator-cap relief pressure is 13 PSI.

The charging-system flowchart specifies 13.0–14.6 V DC at the battery with the engine running at 3,000–4,000 RPM.

PDF Search, Chapter Access, and Page Count

Text navigation and wiring detail: The workshop text is searchable, with embedded bookmarks for all ten chapters. Labels within the full wiring diagram are not searchable; its small wire codes and connector labels require zooming for comfortable reading.

Supplied as one printable, English-language 247-page PDF. The total comprises 246 manual pages, including the indexes and notes pages, and one nontechnical introductory page.