2005 Kawasaki KAF620 Mule 3010 Trans 4x4 Service Manual, Page 256Get this manual
FINAL DRIVE 12-35 Drive Shaft and Axles
the universal jointsCheckjoint does not work smoothly without rattling or stickIf any ing, the joint bearing is damagedReplace the axleVisually inspect the splines on the shaftIf they are badly worn or chipped, replace the axleClean off the joint parts
CAUTION
Never clean the boots with mineral oil or gasoline because they will deteriorate the boot