Remove the cover from the motor unit. I'm sure you will find white sawdust all over and the drive gear will be stripped. It is a white nylon gear just in front of the motor. The part number is 41A2817 and comes with instructions. It is available at any door opener service company.
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Remove the cover from the motor unit. I'm sure you will find white sawdust all over and the drive gear will be stripped. It is a white nylon gear just in front of the motor. The part number is 41A2817 and comes with instructions. It is available at any door opener service company.