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Craftsman garage door opener won't go down!

Posted by Keith on March 15th, 2003 09:10 AM
In reply to Motor hums but door won't open by Andrew Margrabe on January 29th, 2003 06:47 PM [Go to top of thread]

I just fixed mine. The drive belt had broken inside the drive unit (the opener up on the ceiling). Like yours, when I push the button the motor would hum but the door did nothing... broken belt.
I simply replaced the belt. It was a 31 inch belt part number 4L-310... you can find it at a auto parts store or the internet... piece of cake.

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