Liftmaster GDO problem Part 2

mikegtoltdApril 23, 2006

This is a follow up to my previous post. On disconnecting the power and removing the housing, a broken nylon gear was found on the opener shaft. Turning the motor shaft manually succeeded in sending the rest of the gear flying across the garage (and me to once again thank those who insisted I wear safety glasses as a rule and not an option). The motor shaft was very tight to turn with the opener gear engaged with the worm gear; both shafts turn freely now. My question now is what could be the cause and solution to this problem, ie temporarily stuck motor, failing motor etc. Again, thanks for any help with this.

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I don't know which post to answer. It sounds like your original problem was the door opened too far and the trolley jammed against the bolt in front of the motor unit. Post back and we will go from there.

    Bookmark   April 24, 2006 at 2:42PM
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There doesn't appear to be any way the trolley could jam in a "stuck on to" way but there is evidence on the trolley and the stop bolt of contact wear. When I took the cover off, the trolley did not appear to be jammed, but unfortunately it is not something I thought to look for. Thinking back, this gdo did have a bang and shudder when the opening cycle completed, but it didn't sound like anything to be alarmed about, just thought it was a noisy gdo. After removing the cover and finding the broken nylon gear and the possibility that it was opening too far, ie jamming against the bolt, is it possible that all this jamming cracked the nylon gear which eventually broke, jamming itself against the worm gear and causing the motor hum? As it stands now, I have a motor that runs free but no nylon gear on the opener shaft. Ideally, I would like to replace this gear and adjust the door so it doesn't happen again, if the above seems like a reasonable explanation. If so I would need advice on the following:
1. How do I remove the pins on the shaft to install a new gear? Where do I get a new gear?
2. The troubleshooting part of the owner's manual suggests a broken spring; this is an aluminum section door and I can lift it easily. How do I test the spring? If the spring was broken, would this cause the motor hum or would there be a straining sound instead?
Thanks for the help.

    Bookmark   April 24, 2006 at 6:05PM
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