2005 Kawasaki KAF620 Mule 3010 Trans 4x4 Service Manual, Page 314Get this manual
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FRAME 16-11 Seat and Seat Belts
Install the front [A] and rear seat belts so that their installation angle is 40 60 [B]
Tighten:
TorqueSeat Belt Buckle Mounting Bolts: