Question about Chamberlain 12HP Power Drive Chain Drive Garage Access System

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The garage door is up and travels down a few inches and goes back up chamberlain 1/2 horse heavy duty. I fix the gear worm and bushing kit I tried it with the door off and on no difference manufactured 6/93

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If your garage door has the sensors at the base with a laser light, check the aim of them.

Posted on Feb 13, 2011

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Posted on Jan 02, 2017

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Have a chamberlain 132c2105-4 u it. Door moves up a few inches and down a few inches. Have played with limits and travel and sensitivities but can't get it to travel further. Help. Gordon


The chamberlain garage door openers have a label with the model number close to the light bulbs. The number you gave is the number of a label. Also, the "PART NO:" is just the receiver board part number.
Pull the cord to release the opener and check the full travel of the garage door. If it binds or catches, that might be stopping the opener from working. If that's not the problem, check the main gear by unplugging the opener and removing the shell. Then plug it back in and see if the gear contacting the worm gear on the motor shaft slips.That is the most likely worn part that needs replacing.

Aug 17, 2016 | Building Materials

1 Answer

I changed the gears in my craftsman 1/2 hp , chain-driven garage door opener and now the door only goes up a few inches before it goes back down. Any ideas what to do next?


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 10, 2010 | Sears Craftsman LiftMaster Chamberlain...

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

Liftmaster 1265 won't motor more than a foot in the down


Check, The black interruptor cup. See if it has powder from gear on it , Remove particles, And run a Q-Tip between the two little towers on the RPM sensor, Which the interruptor cup rotates into to count rpm cycles.

Dec 31, 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

Door won't open or close


If you have a Chraftsman/Liftmaster:
1.Check to see if the door is running correctly.  A. Run the door down and pull the emergency release. See if the door will run easily by itself.
  1. If it runs hard by hand try lubricating the rollers and hinges with silicone spray or some form of lubricant (not WD 40)
  2. If the door is heavy and falls back to the ground, you probably have a spring issue (either broken or needs more tension) in this case call a professional door repair company in your area.
2. If the door runs fine your gears might br out of your opreator. Open the case and look for a white powder. If you see that and your gears look worn repace the gears with 41c4220a gear kit.
( with the 5 flashing the traveler is jammed up against the top bolt. The same part will fix the problem be sure to replace the bottom bushing on the motor bracket.)

Feb 06, 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...

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