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

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Garage door doesn't open or close

Once again my wife left this morning and the garage door would not close. It's a Liftmaster 1/2 HP Security Plus chain driven opener. The motor hums but nothing happens. The chain doesn't move or the stocket on top of the motor doesn't move either. Any suggestions?

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  • 13 Answers

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 :) .

Posted on Mar 26, 2009

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1 Answer

Motor runs but door won't open. checked chain, seems to be ok


Hello,

The problem is not the chain, it is the plastic gear in the unit of the liftmaster Garage Door 1/2 Hp.The plastic gear is not engaging, although it sounds like it is working.

You will have to replace it with a new one, then the liftmaster Garage Door 1/2 Hp will be able to open up once again.

Once you open and remove the old gear, Be sure to thread the screws in all the parts before you install them. Pre-threading them once would really help. Secondly, label the wires on the back of the opener before lowering it to the ladder, so you can put them back in their proper place.

Hope this was helpful.
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COULD BE THE SAFETY EYES OR THE RPM SENSOR.

IF HOLDING DOWN THE WALL BUTTON ALLOWS IT TO CLOSE NORMALLY THEN IT WOULD BE IN THE SAFETY EYES.
IF NOT CHECK TO SEE IF THE RPM SENSOR IS IN THE CORRECT POSITION ON THE MOTOR SHAFT.
IF YOU NEED FURTHER DIAGNOSTICS GOTO LIFTMASTER.COM AND SOWNLOAD A FREE PDF FILE OF THE OWNERS MANUAL.

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The shaft on these garage door motors are not direct drive systems. You'll have to open up the box to see what the actual problem is. I have had stuff like this happen where a gear just slipped out of place.

http://www.aaadooropeners.com/?gclid=CLH3wt628p8CFVZS2goduwSLYQ

Here is a link for a parts supplier. I don't know your model but it looks like most of the Liftmaster worm screw gears and drive gears are plastic so it's possible that one of them has cracked.

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The motor is probably either stalling because the door is too stiff, or you have a beam break detector that is being triggered when the door is halfway down.

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If you have a Craftsman/Liftmaster can you push and hold the wall button to make it go all the way down? If you can than photo eyes are your issue. Check and see if they are both lite.

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