[C320-list] Transmission fluid

[Richard A. Walsh]

I have a 2000 320 with the Yanmar european engine, I believe the transmission is a Hurth.  In reading thru the Yanmar manual they don't seem to specify the transmission fluid to use.  I have been told a regular 30wt oil will do and someone else said must use atf, any insight?  I also notice the figure in the book showed a high and low point, mine only has a low point on the dip stick?