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

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Chain on garage door not moving but motor is running. Model 1255SCR 1/2 HP.

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This means that the nylon drive gear in your unit has been stripped. This can be replaced and is common in openers. You can get a replacement at chamberlain.com. It does take moderate skill to do and should take about an hour to complete. You can order the gear by itself or the whole drive shaft. Make sure and set the limits per the manual and do a 2x4 safety reversal test afterward. Thanks BB

Posted on Sep 16, 2010

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Posted on Jan 02, 2017

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1 Answer

Garage door moves few inches and stops, springs are fine, sensros are fine.


If it is not blinking when it stops, then the capacitor is blown. Replace the capacitor and it should resolve the problem.

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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.

Dec 02, 2011 | Home Security

1 Answer

Have a Craftsman 1/2 HP Garage Door Opener, been working fine. Now when you start it you hear the motor running as normal but the chain doesnt move?


You must ensure the drive chain is engaged to the door puller.
Sometimes the emergency release if pulled (red cord) the drive and the coupling come separated.
Make sure the pin is back in place (pull release cord and make sure pin springs back in).
The run an open close cycle, it should pick up the drive again.


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Please dont forget to vote this answer was helpful and accept my answer.


Many thanks

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Feb 22, 2011 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My Craftsman 1/2 HP Garage Door Opener stopped working. The motor is running but chain isn't moving. The actual door goes up and down fine.


Remove the cover and take a look. I'm sure you will find the drive gear is stripped. It is a white nylon gear just in front of the motor. You can buy one at any good door service company. The part number is 41A2817 and it comes with instructions.

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

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...

1 Answer

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You should check the gears inside the box, After years , the gears get dry and die, you can by online or from Sears the kit and replace the old gears. I just changed mine...not too difficult :) .

Mar 11, 2009 | Chamberlain Powerdrive PD422D 1/2 HP...

1 Answer

Motor sounds like it is running but sprocket doesnt move


how old is unit. sounds like gears are shot, takes $25 of parts and 2-3 hours to fix if you are handy. Take cover off, If it has white powder (Not ****), gears are shot.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door model PD200


Take the back cover off and see if the Gear that turns the shaft that operates the chain to lift or close is in good condition.
The gear is probably plastic and 3" or 4" in diameter.
UNPLUG THE OPENER AND DISCONNECT THE POWER BEFORE DOING THE ABOVE.SAFETY IS ALWAYS FIRST.

Jan 16, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

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