Bought water tower from Trainz. Hooked it, pushed the button, motor hums, water spout does not move. Removed motor and can work the spout up and down by hand. I can see the gears, even the one where the motor goes, working when I move the spout. Replaced the nylon pinion gear on the motor shaft with a recommended new brass gear. Put the motor back in and the spout locks up and not move either up or down. Any guesses as to where the problem might be? What would be the next step? Thanks
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