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My lynx 455 automatic doorman is not opening or closing door , i had a closer look at it the motor is running and the little shaft is turning but the cog wheel on the shaft isn't turning the chain

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6ya6ya
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Posted on Jan 02, 2017

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  • 3197 Answers

SOURCE: Hi, I have a Lynx 455

Check the sensors in the doorway. Sounds like they may be misaligned. They need to be pointing at one another to work properly.

Posted on Sep 28, 2010

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  • 3197 Answers

SOURCE: Automatic Doorman model 455 learn button location?

The button should be on the back of the motor unit. You may have to remove a light lens to find it.

Posted on Oct 06, 2010

  • 3197 Answers

SOURCE: installed two new springs on

Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

Posted on Sep 06, 2011

  • 21 Answers

SOURCE: I have a Craftsman/Chamberlain 1/2 hp 315mhz Garage door opener model 139.1845.DM just stopped working. The motor runs the chain moves, the door doesn't open. Whether I use the remote or pad still n

All garage door openers have a quick release. Have you checked to make sure that is locked in place? Most have a cord hangin from it and you pull it which releases it from the chain. Make sure that is engaged and it should work.

Posted on Dec 02, 2011

SOURCE: my stanley garage door opener's chain snaps everytime i open with remote

have you checked the chain tension adjustment for proper amount of deflection? This is listed in the manual that comes with your garage door opener. Usually, the chain is too loose from the problem that you are describing. I would check online for the manual if you don't have access to yours. Also, the travel adjustments for stop (up and down resting positions) would be explained as well.

Posted on Oct 07, 2012

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1 Answer

How & where would I get parts to repair my Lynx 455 garage door opener, installed in 1989 ?


Wow - lots of hits. Google: Lynx 455 garage door opener parts

This will start with service vendors who have parts and are close to you. After that, you will see the manufacturer pages.

Mar 03, 2015 | Building Materials

1 Answer

Where does the wires hook from motor to where? Automatic Doorman 455


Is the door opener motor bad? You say, "the wires"--is there a plug on the end of the wires that can be plugged into an outlet? If so, thy plugging it into an extension cord instead of the outlet in the garage ceiling and see if you still trip a breaker. If you do, it's a problem in the opener. There are things to do to locate the source of the problem. It the breaker trips instantly when you press the button then there's a dead short somewhere. Does the motor get warm or hum before the breaker trips? If so, then maybe the door mechanism is locked up and the motor cant turn. Did you check to see if your garage door is locked?

Nov 26, 2014 | Building Materials

1 Answer

Installed two new springs on automatic doorman model 455 and it won't close or open. chain will not move door where are adjustment screws? I think that may be the problem


Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

Sep 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Automatic Doorman Model 455, problem is door goes down with no trouble, but lifting it goes about 10" and stops. I have changed the "V" belt, the problem still exists. I did an...


You are probably right about the motor going.Does it get to a point where the door stops and the motor is making a humming sound? If so the motor is going for sure...In the mean time to get you by,try putting more tension on the spring of your door to give the electric door opener a little extra help as its opening.

Nov 15, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Automatic Doorman model 455 learn button location?


The button should be on the back of the motor unit. You may have to remove a light lens to find it.

Aug 01, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have an Automatic Doorman 455 garage door opener. The door while going down hit the top of a garbage can and instead of going back up, was stuck with motor running for 2-3 mins. before I pulled the plug...


I am assuming that the motor runs but the belt slips (until you give it an assist).
The belt got glazed when it sat there stuck with the motor running, and now it is too slippery.
Take the belt off. If the pulleys have a blackened coating (melted rubber) in the v, you should clean them up. Steel wool works well for that.
You might be able to salvage the belt by roughing up the friction surface with sandpaper (about 100 grit). If the belt is old and has cracks, just buy a new belt.

Mar 30, 2010 | liftmaster Chamberlain Garage Door Opener...

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