What Allan was talking about is the snap ring on the end of the shuttle valve. The shuttle valve is accessed by removing the recessed square plug the arrow is pointing to in Allan's photo. Once the plug is out there is a cap with a slot in it that you unscrew to get to the shuttle valve. The snap ring is on the end of the valve under the cap. In the parts diagram (Power Train > B-10 Power Train, Center Section Body And Related Parts, Tractors With Hydrostatic Drive) the shuttle valve is # 9 and the snap ring # 13.
As far as what I was talking about, I understood that the problem only occurred once when you were operating the tractor. Then after you shut it off the problem again would only occur once the next time the engine was run. As long the tractor was not shut off the problem only occurred one time.
Hopefully you are checking the trans/hydraulic oil level only after the tractor has been run for at least two minutes at 1200 RPM or above. There are no oil seals as such that seal between the hydro section and the rear frame, only shields that restrict the oil flow. With the engine off the oil will quickly drain out of the hydro section until the level equals that of the rear frame. At low idle there may not be enough flow to fill the hydro section so the engine need to run at a faster idle to be sure it fills with oil before checking.
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