2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 289Get this manual
FINAL DRIVE 3Turn the screw in until it is lightly seated, then turn the screw out 14 turn4Set the gearcase uprightRotate the input shaft at least timesThis ensures the ring gear completes one full rotation
FRONT DRIVE (CV) SHAFT
Inspection
Check the front and rear driveshaft CV boots for any tears or leaking greaseIf the driveshaft boot loses all grease, CV joint failure will occur
5If tight spot is felt during rotation, loosen the backlash screw another 18 turnPerform the step 16 againRepeat this procedure until the pinion shaft rotates smoothly times (1 revolution of ring gear)