2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 86Get this manual
ENGINE 2Note the alignment dots on the balancer and crankshaft gears, the marks must be aligned during reassembly
CRANKSHAFT REMOVALINSPECTION
3Turn the shaft until balancer counter weights clear the crankshaft and remove the balancer shaft from the crankcase4Inspect the balancer drive gear and pump shaft drive gear5Replace 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 fit tightly in the crankcaseThe inner race should be firm with minimal side to side movement and no detectable up and down movement