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Sears GDO

Posted by billy_barker (My Page) on
Tue, May 25, 10 at 20:19

I have a Sears 3/4 hp GDO that is approximately 5 years old. It hasn't ben working for the last year or so. It was doing some extra work due to a door alignment problem. I also had a wiring issue that I figured out by taping the safety sensors together (yes, for diagnositc purpose only!). Before I went through the trouble of replacing the wiring and remounting/adjusting the chain I decided to push to open button on the wall switch. The motor starts and runs for 3-4 seconds in the counter clockwise direction and then reverses direction for the same 3-4 seconds. I expected it to run for the usual 7-10 seconds and then stop. This doesn't seem normal, does it? Do I perhaps have another problem? I did check the internal gears and they all seem fine with plenty of grease etc. This site has excellent posts regarding GDOs and I have already learned a lot. Thanks in advance for any advice you can give!

Follow-Up Postings:

RE: Sears GDO

If the main light flashes 10 times when the door reverses you still have a door sensor problem.

If it doesn't then your problem is most likely the RPM sensor board which is a small printed circuit just in front of the motor. First make sure the black plastic interrupter cup is on the end of the motor shaft and is pressed all the way on. That too can cause your problem.

RE: Sears GDO


Thanks so much for the speedy reply - I'll give it a shot. I saw the RPM sensor, just didn't know what it was for. I did spin it a few time, but didn't notice if it was inserted all the way. I will post what I found.

Thanks again!

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