2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 123Get this manual
CRANKCASE BEARING INSPECTION
1Remove the seal from the PTO side crankcase2Inspect 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!