A new problem detected

[drh1965]

I was doing maintenance on my Hurth tranny and noticed that it was quite overfilled. I drained it to find that the fliud was contaminated with a lot of water. On a small diesel like my Universal M18, would the transmission be equipped with some type of water jacket? I'm assuming not. How else would water get in the tranny? I assume it must have got in the through a vent but that implies the boat has been filled with an awful lot of water at some point. The engine was not contaminated...

I can't find any details on the Hurth tranny on the net. The owner's manual says virtually nothing about it. Can anyone help me out here?

Thanks.