2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 139Get this manual
6-12 ENGINE LUBRICATION SYSTEM Oil Temperature Sensor (KAF400-AC)
Oil Temperature Sensor Removal
Maintenance chapter) Sensor Lead Connector Oil Temperature Sensor [A]
Remove:oil (drain, see Engine Oil Change in the Periodic Engine