Did you get it apart ? If you are having a hard time separating the halves you can loosen the screws slightly and just lightly tap the head of the screws. You should not need a big hammer, just the handle of a screwdriver should work.
Did you get your new one yet ?
Theory only works perfect in a vacuum.
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Tapping the loose screws is a good method. Have not messed with it yet. Have the replacement motor & very lazy in installing it. Not feeling like lying / kneeling right now. Wife hasn't yet complained about doing dishes by hand