2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 228Get this manual
FINAL DRIVE 11-11 Front Final Gear Case (KAF400-AC)
Front Final Gear Case Assembly
pinion gear Visually check thedamageand ring gear for scoring, chipping, or other Replace the bevel gears as set if either gear is damaged since they are lapped as set in the factory to get the best tooth contact
Assemble the gear case temporarily for the gear backlash adjustmentClean the mating surface of the front final gear case and Install:
coverPinion Gear Unit [A] Shim [B] Ring Gear Assembly [C]