On 7/15/18 6:14 PM, GOM wrote:
Garage Door wont work. Motor €œgrinds€� but the chain/retracting cable
does not move. Unit is a Chamberlain security 1/2 horse power.

Are the door's counterweight springs intact?

If one or both failed, the unsprung weight of the door exceeds the
motor's lift capacity and it may grind- or just lock up.

--
The democracy will cease to exist when you take away from those who are
willing to work and give to those who would not.
- Thomas Jefferson