2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 248Get this manual
FINAL DRIVE 11-31 Bevel Gear Case (KAF400-AC)
Bevel Gear Inspection
the drive the driven Visually checkfor scoring,bevel gearor[A] anddamagebevel gear [B] chipping, other Replace the bevel gears as set if either gear is damaged