2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 235Get this manual
11-18 FINAL DRIVE Front Final Gear Case (KAF400-AC)
If the preload is out of the specified range, replace the ring gear shim(s)To increase preload, decrease the size of the shim(s)To decrease preload, increase the size of the shim(s)Change the thickness little at timeRecheck the preload, and readjust as necessary
Measure the preload using torque wrench [A]Pinion Gear Preload Torque: 0.5 Nm (0.05 kgfm, 4.4 inlb) or less
Special ToolPinion Gear Holder [B]: 57001-1632