Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Garage door will not work

I have 1/2 hp chamberalin door opener. the worm gear and the other plastice grar wore out I replaced these 2 gears now my door open and close only 1 foot,

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  • jenandjeff3 Jan 17, 2009

    I Have the same problem, everything looks to be connected. my door only moves 6-8 inches and then goes in the opposite direction. Can somebody help this is so frustrating.

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  • 98 Answers

Check to see if you plugged in the 4 wire limit assy. harness.

Posted on Jan 06, 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.
Goodluck
Elect_Comp

Jun 27, 2011 | liftmaster Garage Door 1/2 Hp

1 Answer

Liftmaster 1/2 HP Garage Door opener won't open or close. Has been working fine until I pulled out this morning. The door will move freely if I disengage from opener. Went up ladder to see chain not...


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.

Feb 14, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have replaced the worm gear assemble twice in my craftsman 1/2 hp garage door. what am i doing wrong. why does it keep turning to dust


Use that small tube of grease in the kit and smother the gear teeth with it. Use it all. Also disconnect the opener from the door and lift the door by hand. It could be the springs are either broken or so heavy the opener can't survive lifting it.

Feb 12, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Had 1/2 hp sears/craftman chain drive garage opener for a number of years but recently garage door did not open all the way. Discovered worm gear and main gear worn out so replaced them with kit from...


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.


Jan 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 hp garage door opener, model 139.53970SRT, 8-99 Was working fine, then the plastic drive gear got stripped. I replaced the worm and drive gears and all works great mechanically, except...


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.


Nov 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door only opens 4 inches then reverses and stops


you need to replace gear when the door is fully closed. then do your tweaking.

Jun 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Need part 41A2817 drive/worm gear kit for Sears


as long as the door is less than ten years old, sears will stock the part you need. you can contact them through this link.

http://www.searspartsdirect.com/partsdirect/index.action?psid=58709328&sid=PSx20071217x00001a

Apr 22, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Opener goes 12"+/- and then returns


havent heard any of yu say you adjusted the down force.

Jan 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener motor will not open garage door


It sounds like you did a really good job! My Craftsman 1/2 hp gar. dr. opener has a red reset button on it on the l/h side as you are looking at the light/motor from the garage door opening. You have to take the light cover off to be able to see it. My reset button is on the same side as the ground wire. You might check the ground wire while you're there. I really hope that this fixes it for you (and me). I'm quite sure it will as you know your way around the garage door opener already. Good Luck and Let me Know (Please) if it fixed it or not. If I think of anything else, I'll let you know. Have a Good Day!

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

3 Answers

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


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.

Oct 08, 2008 | Chamberlain Powerdrive PD422D 1/2 HP...

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