won't open with weight of door, but opens/runs when detached

by Bob
(Kentucky)

Overhead Door Legacy 496cd/b model. Intermittently will open with door attached, but more often than not, we have to pull cord and push open. Then we can hit button and the chain/motor will run to "open" position. It will lock into position and reengage the door. It then closes with no problem.

I know this is fixable, just don't know what to replace/fix. I am very handy and can fix about anything.


OK Bob. When the door does open with the remote, does it open smoothly or is it hesitant?
What about when it doesn't - does it move at all?
After you disengage the door, do you feel any binding as you open the door manually?
Does it feel heavy?

Check the track - is it straight? Any bends?
What about the rollers? Are they worn or loose, do they work freely?
What about the spring? I assume it is not broken or the door would never open with the motor and would feel very heavy when opening manually. It may feel heavy if the spring is out of adjustment.

Check those then we can go from there.

Donald

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Jun 21, 2016
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Reply to Donald
by: Bob

OK Bob. When the door does open with the remote, does it open smoothly or is it hesitant?

Smooth, no hesitatation.

What about when it doesn't - does it move at all?

Easily. It feels like the motor is just too weak to pull it up. It will take door down no problem.

After you disengage the door, do you feel any binding as you open the door manually?

Nope.

Does it feel heavy?

Nope.

Check the track - is it straight? Any bends?

No bends, runs great when pushed up manually.

What about the rollers? Are they worn or loose, do they work freely?

All work freely, runs fine when emergency disconnect is pulled.

What about the spring? I assume it is not broken or the door would never open with the motor and would feel very heavy when opening manually. It may feel heavy if the spring is out of adjustment.

No spring, chain drive.

Check those then we can go from there.

Really appreciate all your help! I'm really thinking its a motor or capacitor (if so equipped). It works every one in a while on its own, but mostly it doesn't and only after I disengage it, push the button so the chain goes back into position and then locks back in when door is up. Then it goes down without a problem.


Is there no spring on the torsion bar above the door? If not, this must be a very lightweight door.

I suspect you are correct and the problem is with the electronics, most likely on the control board. It usually takes someone experienced to find this kind of problem which means you will likely have to call your local service center.

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