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I have a 3220.51 Stanley garage door opener. It is probably close to 20 years old but averages 1 opening/closing a week. The chain keeps popping off of the gear on the motor. I have tightened the tension, unhooked the carrier and ran without the door attached and it still jumps off with a sudden BANG. I can see nothing wrong with the chain. I can see no restriction that might be catching and it doesn't seem to be happening at the same spot. I ran the motor without the chain on it and noticed a "slight" wobble but wouldn't think it enough to cause this problem. Any ideas??

Posted by olsong2 on

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5 Related Answers

Anonymous

  • 16 Answers

SOURCE: garage door close but motor keeps running

The close setting limit switch needs adjusted. Once it is adjusted it should work just fine.

Posted on Jan 12, 2009

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Mike Schmidt

  • 227 Answers

SOURCE: Garage door shakes as if off balance when closing

  • The garage door may be out of balance or a spring may be broken. Close the door and use the emergency release handle to disconnect the trolley. Open and close the door manually. A properly balanced door should stay at any point of travel while being supported entirely by it's spring(s). If it does not, disconnect the garage door opener and call a garage door professional. Do not increase force to operate the garage door opener.

Posted on Feb 21, 2009

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Don Maggard

  • 3197 Answers

SOURCE: Garage door opener won't open or close door

The drive gear is stripped. Remove the cover and you can see it just in front of the motor. It is white nylon and the part number is 41A2817. Available from Sears or any good door opener service company. It will come with instructions.

Posted on Jun 06, 2009

J. Bradshaw

  • 121 Answers

SOURCE: echo cs3450 tension screw won't tighten chain. I

If you remove the bar you will be able to access the acrew and nut to see what the problem is

Posted on Jul 11, 2009

joecoolvette

joecoolvette

  • 5660 Answers

SOURCE: chainsaw chain will not tighten on the guide bar

The two nuts on the bolts for the chain bar, need to be loosened.

Then the tension screw is tightened by turning it Clockwise. (To the Right)

If the chain doesn't tighten,

1.Insure that the nuts are loose enough, so that the chain bar may slide.

2.Insure that the tension adjusting screw does not have stripped threads, nor the threaded part of the case it screws through.


Posted on Oct 17, 2009

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