2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 229Get this manual
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11-12 FINAL DRIVE Front Final Gear Case (KAF400-AC)
Stake [A] the pinion gear bearing holder [B] with punch to secure it
Apply grease to the oil seal lips, and install it in the gear case<