if the motor was out of alignment, like having a cable on each side of the motor, it should still turn, just sound horrible.
How's the motor height? And how do the brushes look?
Sounds like it may very well be a mechbox issue at this point. What I've done in the past is take the mechbox out and try to cycle the piston back aprt ways by hand, use a small flat head to turn the bevel gear. It's hardened so you shouldn't be able to damage it in any way.
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