2004 John Deer Buck Utility ATV 500, 500EX and 500EXT Service Manual, Page 82Get this manual
Remove bearings no28 and oil seal no31Discard oil sealWater pump bearings no28 must turn smoothly and freelyIf not, change the bearings For installation, reverse the removal procedureInstall new oil seal no31This seal must be replaced each time the shaft is removed
Remove water pump shaft no26Using suitable puller, remove bearings no28
For installation, reverse the removal procedureTo determine if the ceramic seal no27 is still good, check if coolant trickles by the leak indicator holeIf so, replace the ceramic seal