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Craftsman 1/2hp GDO open and closes 6'

Posted by gmwest (My Page) on
Mon, Jul 23, 07 at 13:49

replaced the gear sproket and worm on my GDO model #139.53975SRT1 door would only open and close 6". Adjusted up and down limits, checked sensor and wiring. Just replaced RPM sensor and still only goes up and down 6". Light on the side of GDO blinks 5 times then repeats.


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RE: Craftsman 1/2hp GDO open and closes 6'

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the rpm sensor is plugged in. If none of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.


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