yeah on a lot of kubota tractors, the hst filter is right under the floor, kinda beside the transmission. It is in an area that commonly gets dirt/grass/etc in there. When you change the filter, sometimes a tiny piece of grass (one blade) can get in between the filter seal and the filter mount resulting in small leak. Most of the time you never see it until you take the filter back off. It takes VERY little to make the seal, lose it's seal. Additionally make darn sure your old filter still has it's gasket on it. I have double-gasketed a filter once and it cost me a $5000+ engine. In my own defense it was on a machine that the oil filter is mostly inaccessible, you just feel around for it. Can't see it. Still shoulda checked the old filter though, but alas, dealer work....fast as possible so the next customer will quit crying about you being too slow.
