That seems most unusual. I, like you, am under the impression that these systems are not vented. First off leaking into the engine crankcase. It appears as though your seal in you pump is either leaking (seems to be pretty common) or some pressure (which I would have to believe was on the input line) was forcing the seal out. I am assuming that when you say it pushes fluid out of the top of the rear cylinder you mean the fast hitch cylinder? I would think it would take incredible pressure to do that as that seal is under pressure when it's running and should me more than capable of holding back ~1000 psi. Do any of these leaks occur while running?
I am only guessing at this point but if it was me, I'd try filling up the system, run the tractor for a little bit, shut it down and then VERY CAREFULLY loosen and remove the fill plug on the unit and see what happens. That should eliminate building pressure or not. Beware they will usually build a small amount of pressure while running (as they heat up) and you will likely hear this release as you remove the filler plug. Best of luck, Sam
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