Question about Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener

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My garage door Chamberlain1/2 HP

The chain does not pull the door up nor down. The motor makes whine sound. When it's attached to rail.


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  • Anonymous Feb 02, 2009

    the door open half and clost ,clost half and open.



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  • 118 Answers

You have a stripped gear inside the opener. When you take the cover off it will be full of small white flakes. Replace the entire gear and sprocket assembly

Posted on Jan 30, 2009


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1 Answer

How do I stop my craftsman garage door opener from whining? it whines on the inside of the motor

is it gear or chain, is it genie or liftmaster. check for smooth operation of door by disconnecting motor. check tightness of cable/chain running down rail. this may be putting undue stress on gears and ruining plastic drive gear.

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1 Answer

Attaching chain to rail . chain seems to be to short?

If this is a new opener make sure the rail is pressed all the way into the motor opening.

Sep 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

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I have a Craftsman 1/2 hp garage door opener. Last night I had to open it using the emergency release due to power failure at house. Now it won't catch the door to open it although the chain mechanism...

That lever that the red handle pulls down is made to catch in the unlatched position. You can pull down on it again, and then pull the cord for and aft (parallel to the chain rail) and let it snap back up. Then either run the trolley or move the door and it will click back in.

Feb 13, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

The motor on my Genie Chain Glide garage door operator runs but the chain does not run or move.

If the chain does not move but the motor runs then you have stripped the internal gears. I would replace here. These chain glide units are not very strong. There might be a chance the chain is telescoping down the rail but the trolley is not hooked up. Pull the red cord back toward the motor to engage. Thanks BB

Dec 29, 2009 | Genie Company Genie PowerLift Excelerator...

1 Answer

Craftsman garage door opener 1/2 hp will not open door

It sounds like your chain is out of sync with the limit switches. Loosen the chain enough so that you can remove it from the sprocket on top of the motor unit. Now run the opener until the sprocket runs counterclockwise and stops. Now with everything attached and the door in the open position replace and tighten the chain. You are now in sync. You may need to tweak the up and down limit controls which are on the side of the motor unit.

Aug 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

On my craftsman 1/2 hp garage door opener connected to our 20 year old garage door, lately it has been getting stuck only about a foot off the ground, the chain is saggin so that when the garage is open...

It may not be the opener causing the problem.Unhook the opener from the door by pulling on the red disconnect handle. Push the door down or pul;l it up by hand by pushing or pulling on the top center of the door where the opener link hooks to door.See if it moves freely or sticks at the place you described.You could have a door spring problem if the door works ok manually the gear/sprocket in the opener is worn.This is an expensive repair and it might be cheaper to replace the opener.The loose chain could be a sign that the sprocket bearing is worn also.If it is not worn the chain is adjustable at the trolley assembly that slides on the rail.

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1 Answer

How do I disconnect my opener and manually open my garage door?

Check up by the motor. There should be a latch you can pull down that will disengage the chain from the door. After that, just pull the door up or down as needed.

Feb 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers


is bulb on motor flashing 10 times. then you have electric eye problem. otherwise, sounds like you need to increase down force a hair. adjustement is on logic board, right knob.

Jan 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

5 Answers

Chamberlan 1/2 hp security + not working

sounds like it is out of you have a manual on this model

May 19, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

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