Not sure I should say this, but I'd go back to the original belt drive idea, but with a good cog belt and pulleys. Its a very dangerous plan to run gear pumps and motors from the same reservoir as piston pump/motors.
It is very possible that under a sudden heavy load either your gear pump or motor will momentarily "seize" as the gear defects from pressure and gouges into the housing. This can happen also is initial break in procedures are not followed. And its particularly prevalent in the "cheap' components. Once the relief reacts the gear relaxes.
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