2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 240Get this manual
FINAL DRIVE 11-23 Front Final Gear Case (KAF400-AC)
Bevel Gear Inspection
Visually check the bevel gears [A] for scoring, chipping, or other damageReplace the bevel gears as set if either gear is damaged
Differential Gear Inspection