2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 281Get this manual
FINAL DRIVE 6Remove the armature plate (C)Inspect the armature plate for wear, distortion or other damageReplace component as required8Remove and inspect the bearing surfaces of the second output clutchVisually inspect the clutch plate areaIf plates are steel-on-steel, or if the friction material is worn, the assembly should be replaced
9Thoroughly clean all parts10Inspect the rollers (A) for nicks, scratches and flat spotsInspect the roll cage (B) for damage or cracksThe rollers must slide up and down freely within the roller cage surfacesInspect the ring gear (C) for inconsistent wear patternsSurfaces should be free of nicks or burrsB