Well, thank you for your explanation of what the tube is and why it was made that way..... but I already knew all that. I still disagree that the original tube was "light duty".
Yes, the relief valves are under pressure, when it is running. Not much pressure. A few hundred pounds. Charge pump pressure on a non-hydraulic lift machine should be around 150#.
The whole deal with it rolling after it had been sitting and after you released the valves.... that's normal. They can't stick open and the hydro function. If it was stuck, it wouldn't have moved with the machine running... so no. It wasn't stuck open.
Can they leak.. yes. Can they spray.... yes. Not usually the manual relief valves though. Usually the automatic type are the ones that spray.
Looking at the pic of the leak under your machine, I'd say you have a seal leak on the right side swashplate shaft. If it was the relief valves, it would be leaking all over the place, and running down and dripping in the middle. Looks like you will need to pull the rear if you want it fixed.
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