Opener just hums when you try to open/close the door?

Asked by Richard Stock on 12/17/2008 2  Answers
0 I think it's the gear or flywheel (not sure that's the right term) but it looks quite worn or stripped. I'm hoping it's relatively easy and inexpensive to replace either the part or the motor assemby so not to have to replace the whole appliance.
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0 A file was uploaded I found this manual. 139.53500.pdf
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