2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 100Get this manual
ENGINE 4Measure the distance from the PTO crankcase mating surface to the bearing using the same method outlined in Step 1, 2, and 35Add the readings obtained in Step and Step 46Subtract the counter balancer shaft width measured in Step from the figure obtained in Step 57Subtract the thickness of the existing shim from the result of Step to determine if different shim is neededThe result must be within the specified range listed at belowCounter Balancer Shaft End Play: .008"-.016" (.02-.04 cm) 4Subtract the thickness of the existing shim from the result of Step to determine if different shim is neededSee "Pump Shaft End Play" specification belowPump Shaft End Play: .008"-.016" (.02-.04 cm)
ENGINE REASSEMBLY
Pump Shaft Oil Seal Installation