1/2 Craftsman opener only closes a few inches and then opens

carp1977December 13, 2006

The garage wouldnt go up yesterday and when I took the cover off I relized the drive gear had been stripped down and not making contact. However, the motor itself was still going through its cycles. I replaced both the worm and drive gear and thought my project was over. However, now the opener will only run the down cycle for a few seconds and then stops and goes back to the up cycle for a couple of seconds. I thought it might have been a part I put in so I stripped the opener down to nothing except the motor and the motor runs the same way without anything else hooked up to it. Therefore, I am thinking my problem may now be the motor. Please give any advise thay you may have. Thanks.

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I have noticed a lot of people asking this same question on various sites. I found the solution to my problem and maybe yours. My problem was I like to test things before I put all the parts back together. When replacing the worm gear you have to take a plastic cap off along with bearings and washers to pull the motor out. I replaced all the bearing along with the worm gear and tested the opener. It would go in one direction for a couple of seconds...stop...and then go in the reverse direction for a few seconds. I tried everything to fix this. However, the only problem was the black plastic cap that fits over the bearings at the end of the motor shaft. This plastic cap (when operating) turns through the RPM sensor. Without it turning in the RPM sensor the motor automatically would stop and reverse after a few seconds. Took only about 1 to 2 seconds to pop the cap on and now the opener works perfectly. There is no mention of this on any troubleshooting or in the directions for installation of the worm gear. Hope this helps someone else.

    Bookmark   December 13, 2006 at 2:01PM
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Carp is correct. Also make sure the RPM sensor is plugged in as well.

    Bookmark   December 13, 2006 at 3:20PM
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This sound like it may be my problem (see Overhead Door posting earlier) I'm not a door expert: is there a diagram or picture showing how to get to the black cap and would this be true for the OHD model 551 chain drive unit?

    Bookmark   December 13, 2006 at 9:59PM
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