2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 97Get this manual
ENGINE Crankcase Bearing Inspection
1Remove the seal from the PTO side crankcase
Oil SealMechanical Seal Removal (Engine Disassembled)
NOTE: The water pump mechanical seal can be removed without removing the engineRefer to Water Pump Mechanical Seal InstallationReplace the pump shaft seal and water pump mechanical seal whenever the crankcase is disassembled
2Inspect the crankshaft main bearings, balancer shaft bearings, and pump shaft bearingNOTE: Due to extremely close tolerances and minimal wear, the 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 fit tightly in the crankcaseThe inner race should be firm with minimal side to side movement and no detectable up and down movement3Support the crankcase and drive or press the main bearings out of each crankcase4To remove balancer shaft bearings and pump shaft bearing use blind hole bearing pullerNOTE: Bearings are stressed during the removal process and should not be re-used!