External Bow Thruster Install on a H41DS

[seadaddler]

The unit had a drain screw on bottom outside and added oil and let it drain again and everything was good no real water or metal and been fine.
You need to look your manual or contact manufacturer.

 

[Nodak7]

You could drain the oil when ever hauling as for new bottom paint and check for water
and helped a friend do this recently with other unit.
We drained the oil and refilled with new and at same time check for metal bits or water.

Sea, interesting.... I went back to my manual and it states the unit is "absolutely maintenance free". I have a inquiry in to the representative to confirm. Thanks.