In Reply to: Re: Still Need Help! 2N Hydraulics posted by Jack - Iowa on October 01, 2018 at 11:58:42:
I may be getting my lefts and rights confused, but there is a steel tube that transfers fluid pressure from the pump flange up to the top cover. If the turbulence you saw was near that tube, they have been known to rust out and spring a leak. If necessary replacing the tube is possible, but I'd have to do a search for photos and description.
The tube shows up in some of the photos in the FO-4 so you should be able to determine if that lines up with your turbulence.
I dropped the pump on my tractors as soon as I got them because there was no way to know if they had any maintenance in the last 30 years, and they were full of sludge that I felt could only be properly cleaned manually thru the big holes. Complete rebuild kits for the pumps were expensive last time I checked, but individual gaskets, seals, and parts were not bad if specific problems were discovered. Fortunately, the one time I had a problem with the pump, I had a spare on hand that I could swap in there. The broken pump is in my stack of stuff to be rebuilt or sold for parts some day.