2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 95Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 95

ENGINE Oil Pump Assembly 1Clean and dry all parts thoroughlyApply clean engine oil to all partsDo not use gasket sealer on
crankshaft gears, the marks must be aligned during reassembly Counter Balancer Shaft RemovalInspection 1Remove the shim washer
(A) from the counter balancer shaft4Inspect the balancer drive gear and pump shaft drive gear 5Replace the shaft if gear
teeth are abnormally worn or damaged6Inspect the balancer shaft bearingsNOTE: Due to extremely close tolerances and minimal
wear, the balancer shaft ball bearings must be inspected visually and by feelLook for signs of discoloration, scoring or
gallingTurn the inner race of each bearingThe bearings should turn smoothly and quietlyThe outer race of each bearing should