2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 197Get this manual
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9-28 TRANSMISSION 2WD4WD Shift Mechanism (KAF400-AC)
inspect: Visuallyon Shifter [A] Dogs
Refer to Bevel Gear Case in the Final Drive chapter2WD4WD Shift Mechanism Inspection