Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Door only travels about a foot then comes back

The plastic gear was worn out, and after replacing the door still only travels about a foot and comes back. The sensors are working properly.

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Check your spings above the door.

Posted on Jul 19, 2009

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1 Answer

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

2 Answers

The motor runs but the chain does not move, we just had it worked on 1 month ago and now this, please help


IF THE MOTOR IS JAMMED (JUST HUMS) LOOSEN THE CHAIN AND ADJUST THE LIMITS AND TIGHTEN CHAIN.

IF THE MOTOR ACTUALLY RUNS AND THE CHAIN DOES NOT MOVE THE DRIVE GEARS NEED TO BE REPLACED. THEY SELL A KIT THAT INCLUDES THE BUSHINGS AND SHAFT. DO NOT BUY THE SMALLER KIT AND DO NOT REPLACE ONLY ONE GEAR (THE OLDER WORN GEAR WILL CHEW UP THE NEW GEAR) THIS MAY BE WHAT YOU HAD DONE - IF SO CALL THE SERVICE GUY THAT DID THE POOR REPAIR AND HE SHOULD REPLACE BOTH GEARS UNDER HIS SERVICE WARRANTY. ANYONE WORKING ON THESE SHOULD KNOW BETTER.

GOOD LUCK.

STEVE

Dec 14, 2014 | Sears Craftsman 13953754 Wireless Garage...

1 Answer

Hello, I replaced a worn out garage door motor with a new craftsman model. The door try's to travel down when the opener is pushed, even though the door is fully closed. I'm no garage door expert, but...


Yes, reread the directions travel needs to be set for both up and down, and MUCH MORE IMPORTANTLY the safety settings must be set. This allows the door to close on a foot and not cause damage....VERY IMPORTANT to set correctly....

Apr 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have replaced new gears and put back chain will only travel down 1 foot and back 1 foot light keeps flashing. Trying to get a full cycle?


When it only travels a short distance, and back up and the light flashes, that means that it's encountered too much resistance and the safety mechanism puts it in reverse and makes it go back up. This prevents children or pets from being crushed. Make sure that the gears are aligned and the chain is not getting hung up. There has to be some resistance causing the safety mechanism to go off. Also, if there is a safety Infra Red sensor hooked up to the system, make sure that it's wired correctly and free of obstruction. This can cause similar problems.

Mar 07, 2011 | 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

Door goes up about a foot and stops


The sensors have nothing to do with your door opening. First thing to check are the door springs. One may be broken. Next remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It may be stripped.

Jun 30, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener will not work after gear replacement


check the end shaft platic cap is installed and runs freely between the rpm sensors.. that might be ur problem..

Mar 15, 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

Chain gear is stripped//garage door opener //lift master 1/3 hp


I made a webpage that includes the instructions that come with the gear kit. How to replace the gears, reset the travel settings, lots of pictures, part lists and numbers.
http://tinyurl.com/gearfix
cb953ba.jpg

Nov 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

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