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Re: Fisher Price Overheating Troubles
Make sure you aren't blocking any vents on the motors. I don't know about the 673s, but similar motors have vents on the same side as the output shaft that are supposed to draw "cool" air over the electrical elements and out the back. Installing the motor in a gearbox will most likely block the vents. There is a thread describing how a team modified their gearbox to allow for cool air to enter at the vents.
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