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

3 Answers

Chamberlain Power Drive 1/2 HP - motor runs but does not move chain

When I try to open the garage door the motor runs and runs until I push the button again to stop it but the chain never moves and therefore the door does not open.

Nothing is straining, the chain is not too tight, the motor does not sound like it is working hard, it just does not move the chain.

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  • Anonymous Nov 29, 2008

    Not this one but a Stanley chain drive unit.

  • savnagaj Apr 03, 2009

    Hi Edward i have the same problem...Where u able to find part. Could u give me more details...

  • Anonymous Apr 30, 2009

    I have same problem but i am not sure how to replace it. Do i have to remove the whole unit down to replace the part or i could do it while the unit is tied up.



    Let me know if you guys know to repair/replace the part.

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I have the same problem with the worm gear shaved. I bought the replacement part and replaced the worm gear. The door did not travel to the full distance between the limit switch. It hit the upoer limit, stopped. When I pressed the remote again, it only reverse for a short distance and never hit the other end of the limit switch. Any hints what the problems are?

Posted on Jun 12, 2009

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You probrbly need to replace the gear and sprocket kit inside the opener. Also make sure the trolly is not disengaged. Tug the rope!

Posted on May 19, 2009

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I have the same problem. I just removed the cover and discovered a nylon gear had been worn out. I found lots of shavings inside the cover. The nylon gear is beneath the exterior chain gear. I am looking for information on how to replace it, if I can find the part. If you decide to look at yours, unplug the power and remove the sheet metal screws securing the bottom portion of the cener cover to the front and back covers. Then just remove the upper screws from the center cover. Good luck.

Posted on Oct 26, 2008

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1 Answer

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


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

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CHAMBERLAIN USES STANDARD BICYCLE CHAIN.

LINK AND MATER LINKS ARE READILY AVAIABLE.

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The easiest way to fix this would be to take the chain off the sproket with the door and the trolley in the down position. Next hit the wall button and pay attn. to weather the gear is turning clockwise, you want it to turn that direction, wait until the unit stops by itself, next put the chain back on and now you should be able to adjust the limits. otherwise you should call a local professional. They will usually service your door as well as fix your opener.

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Have NO IDEA what you are saying. Do you mean you adjust limits and chain moves too far? Or is chain not moving. Bad gears. Toss unit unless you are handy and can rebuild gears.

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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.
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UNPLUG THE OPENER AND DISCONNECT THE POWER BEFORE DOING THE ABOVE.SAFETY IS ALWAYS FIRST.

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