Craftsman Garage Door Opener drive gear replacemnt

bamcobraApril 22, 2009

I have and older (probably prior to 1984) model #139.664956 that has stripped the drive gear. Sears Parts Direct indicates the replacement gear kit (4A1425) has been discontinued. The original gear had 24 teeth. E-bay shows lots of individual drive gears and several gear kits. However, all the ones I can find indicate that the drive gear has 32 teeth, is 2 3/4" in diameter and has a 1/2" shaft bore. The old 24 tooth one has the 1/2" shaft bore, but is so badly stripped, I cannot determine the original diameter. Question is: Can I interchange a newer 32 tooth gear for the original 24 tooth gear (my old worm gear looks OK) or must I also change the worm gear to match the pitch of the teeth on the drive gear. Thanks for any advice.

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The drive gear and worm gear must match. Your opener was the Cadillac at the time it was made but is now so outdated it should be retired. The new models are much safer.

    Bookmark   April 22, 2009 at 9:30AM
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Thanks, Don. I kind of expected that, but was hoping to get one more Summer out of it for the $9.95 wheel. Planned to replace doors and all this Fall. Guess maybe now is the time instead. I have not done a lot of research yet, but noticed the I-drive units from Dalton. Would like to go with a torsion spring this time and I'm a DIY'r. Do you have any opinions on them? It's an uninsulated, detached garage, so I don't need the high end doors, which should keep them pretty light.

    Bookmark   April 22, 2009 at 10:31AM
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The I-drive by Dalton has the worst reputation of any opener on the market. If you are really interested in this type opener you should check out the jackshaft opener by Liftmaster. You can get information on this from any Liftmaster dealer. They are expensive!

    Bookmark   April 22, 2009 at 1:59PM
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Thanks for the tip about the I-drive. Based on your comment, I'll probably end up with a more traditional opener. This garage and neighborhood does not justify the "expensive" models, even though you noted that the original Craftsman was at the high end in it's day. Something basic and safe will suffice.

    Bookmark   April 22, 2009 at 10:27PM
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