I don't know how you would have bolted it together with the valve plate not on the locating pin. It should have gotten stupid tight before coming together.
Second, you can't run a pump not pumping for 15 minutes and not expect damage. Why don't you go drain the oil out of the motor in your car and run it for 15 min. Hydraulic pumps don't splash lube. They are pressure fed. If nothing is working, the worst thing you can do is keep running it.
The ONLY seal that requires disassembly of the pump to change is the left side trunion shaft seal, and they almost NEVER leak. You shouldn't have even taken it apart.
Well.... lesson learned. You ruined your own pump. Find a good used one.
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