2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 279Get this manual
FINAL DRIVE 5Inspect the rollers for nicks, scratches, and flat spotsAlso inspect the roll cage for cracks and ensure the rollers are able to slide up and down and in and out freely within the roll cage sliding surfaces
Coil Testing
Refer to the following tests in Chapter 10
ADC Differential Hydraulic Circuit Bleeding
1Make sure vehicle is parked on flat ground and allowed to sit at least 30 minutes prior to bleeding hydraulic circuit2Thoroughly clean area around and on remote reservoir and hydraulic bleeders3Remove reservoir cap and diaphragm assembly4Make sure hydraulic oil inside reservoir is free of debrisIf any debris is found, use clean rag or suction device to remove from the reservoirNOTE: Debris in reservoir may block porting and produce inadequate bleeding of the systemDecreased performance may be encountered with inadequate bleed of the hydraulic circuit5Begin the bleeding process by filling reservoir to MAX' line with clean Polaris ADC oil6Locate bleeder valves found on either side of differential and remove the protective caps7Turn bleeder valves counter-clockwise to loosenLoosen bleeder screw slowly, allowing oil and any trapped air to flow out of fittingIMPORTANT: Do not allow hydraulic fluid in reservoir to drain below minimum fill lineClose bleeder valve before oil level falls below minimum fill lineRefilling empty reservoir will result in air pockets becoming trappedNOTE: If empty reservoir is encountered, filling of fluid is still possibleVerify air is not trapped before proceeding with step 78Continue steps 6-8 on both sides in sequence until no air bubbles are seen when bleeding occurs9Re-torque both bleeder valves to specification and reinstall cover caps