Finding a gearhead ratio without a part number.

First, separate the gearbox from the motor.

On the first stage of teeth, make a notch on one of the teeth. Not a big one or it’ll make noise when it’s put back together. Then turn the shaft of the motor until the notch makes a full revolution. The number of times that you have to turn the shaft is your gear ratio.

Then measure the diameter of the output shaft so I can tell if the gearhead it’s metric or inch standard.

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