The drive motor is stopped when the ram reaches its top travel limit. To turn the motor clockwise to lower the ram and counter clockwise to lift the ram, this switch controls supply current going to the motor start windings. If you hear rapid tamping when the ram returns to the top, you should replace the top limit and directional switch. If the motor will not start or reverse directions when it reaches its bottom travel limit, you may need to replace the top limit and directional switch.
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