2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 94Get this manual
ENGINE 5Inspect mating surface of crankcase and oil pumpCheck for nicks, burrs, or surface irregularities9Measure pump end clearance using feeler gauge and straight edge6Remove the three screws and strainer screen from pump7Clean screen thoroughly8Remove pump body screw and feed chamber coverPump End Clearance: Std: .001-.003 (.0254-.0762 mm) Wear Limit: .004 (.1016 mm) 10Measure rotor tip clearance with feeler gauge