2008 Polaris Ranger 500 2x4 / 4x4 EFI UTV Service & Repair Manual (P/N 9921267)

This Polaris service manual, P/N 9921267 (copyright 2007), covers the 2008 Ranger 500 2x4 (R08RB50AA) and 4x4 EFI (R08RH50AF, R08RH50AR, R08RH50AT), with maintenance, diagnostics, and repair procedures for the EH50PLE engine platform.

• Periodic maintenance: Severe-use service schedules, lubricant selection, valve clearance adjustment, and inspections of the cooling system, transmission, and gearcases.

• Engine repair: Cylinder head inspection, camshaft timing, crankcase disassembly, lubrication-system checks, and water pump mechanical seal replacement.

• Fuel systems: Carburetor cleaning and adjustment, EFI fuel pump pressure testing, sensor diagnosis, and Throttle Position Sensor initialization.

• PVT and transmission: Drive and driven clutch service, clutch alignment, belt inspection, and internal transmission disassembly and inspection.

• Final drive: Centralized Hilliard front gearcase diagnosis, rear differential service, axle inspection, and front and rear CV joint boot replacement.

• Chassis and brakes: Steering alignment, MacPherson strut and independent rear suspension service, brake caliper repair, brake bleeding, and parking brake adjustment.

• Electrical diagnosis: Power Distribution Module tests, DC/CDI ignition checks, charging and starting fault tracing, and model-specific wiring diagrams.

Written primarily for certified Polaris Master Service Dealer technicians, the manual assumes knowledge of mechanical theory, tool use, and workshop procedures, with access to a properly equipped service shop.

Engine Overhaul and Water Pump Service

Engine procedures cover component measurements, torque tables and sequences, camshaft timing, and crankcase assembly. The EH50PL oil flow diagram supports lubrication-system diagnosis, while the maintenance charts distinguish routine servicing from severe-use requirements.

The water pump mechanical seal procedure allows replacement without removing the engine or splitting the crankcases when the specified service tools are used. Side-loading or bending the pump shaft can turn that repair into an engine-removal and crankcase-separation job.

Mikuni Carburetion and Visteon EFI

The 2x4's Mikuni BST 34mm CV carburetor section includes cleaning, float adjustment, needle-and-seat testing, and a high-altitude jetting chart. Jet needle or piston slide replacement requires a complete carburetor because of the tamper-resistant diaphragm cover.

For the 4x4 EFI, Visteon system coverage includes fuel pressure testing, TPS initialization, sensor checks, and a diagnostic blink code chart. MAP-sensor diagnosis requires separate dealer-only Digital Wrench software.

Fuel pump replacement requires a complete pump/tank assembly; altering the fixed throttle stop requires throttle body replacement.

Because servicing high-pressure fuel injection and ignition systems carries inherent risks, the documentation emphasizes proper depressurization and electrical isolation protocols to maintain a safe shop environment.

PVT Clutches, Transmission, and Final Drive

Polaris Variable Transmission coverage includes a clutch shift weight chart, clutch alignment, and drive and driven clutch service. Separate transmission exploded views identify the 2x4 and 4x4 configurations.

Hilliard front gearcase procedures address AWD engagement and internal component inspection. Rear differential coverage includes locking-system diagnosis, but the rear pinion assembly is not intended for disassembly; pinion and ring gear shimming procedures are outside the manual's scope.

Steering, Suspension, and Brake Repairs

Chassis procedures cover steering alignment, MacPherson strut components, independent rear suspension bushings, and shock spring adjustment. Brake chapters document front and rear caliper service, master cylinder replacement, bleeding, and parking brake pad adjustment, with inspection limits for worn components.

Electrical Fault Tracing

The 2x4 Power Distribution Module and DC/CDI ignition sections accompany charging-system and starter diagnostics. Thermistor reference values, ignition timing data, and cooling-system break-out diagrams support component testing, while separate 2x4 and 4x4 EFI wiring sheets distinguish the electrical configurations.

Valve Clearance and Fluid Capacity Examples

These examples represent a small selection of the manual's adjustment and lubrication specifications. Both models specify intake and exhaust valve clearance of 0.006 in. (0.152 mm), with the engine cold and the piston at TDC on the compression stroke.

The engine oil-and-filter change procedure specifies 2 quarts (1.9 L), followed by an oil-level check. For the 4x4 EFI, the transmission chapter lists 15.2 oz. (450 ml) of Polaris AGL synthetic gearcase oil, while the front gearcase maintenance section specifies 5.0 oz. (150 ml).

PDF Navigation and Wiring Diagram Detail

Search, bookmarks, and diagram detail: Main text is searchable, and bookmarks provide access to chapters and individual procedures. Some diagram labels are not searchable. Small connector labels and wire codes in the full wiring sheets require zooming for clear reading.

Download one printable, English-language PDF containing 355 pages: three opening pages, one blank page, 342 chapter pages including eight notes pages, a four-page index, and five wiring-diagram sheets. All are included in the stated total.