If the gears were stripped, do you think the motor would spin rapidly.
Having no load?

I really don't know, never worked on a device as this. If memory serves the
OP said the motor hummed but didn't turn.

--

Christopher A. Young
Learn more about Jesus
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www.mormons.com


wrote in message
oups.com...
The other day it made a funny
noise and wont move the chain at all to put the door down or up

Check for worn plastic gears in the unit. Also, confirm whether correct
springs were used for offsetting the weight of the door. With the drive
disconnected via the "pulldown disconnect", very little force should be
required to open the door. Similarly, the unit should see very little
load when operating, otherwise, accelerated wear takes place. Homedepot
(if you're in the US) sells springs if it's necessary to repalce them.