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

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Replaced drive gear and now with door down and not attached to belt ,i push the button on wall and motor runs for two feet then stops push button again runs a little then stops

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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.

Posted on Dec 31, 2010

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2 Answers

Garage door opener won't work


Motor has overheated; the motor unit does not operate or trolleyis stuck on stop bolt = Motor unit hums briefly; RPM Sensor =Short travel 6-8" (15-20 cm).• Unplug unit to reset. Try to operate motor unit, check diagnostic code.• If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace RPMsensor.• If motor unit doesn't operate, motor unit is overheated. Wait 30 minutes andretry. If motor unit still will not operate replace logic board.

Aug 30, 2012 | Craftsman 3/4 Hp Garage Door Opener System...

1 Answer

It's not a remote part that I replaced it's the plastic gear of the garage door on the ceiling of my garage. Now it does not work. Only goes up and down 2 feet when I press the wall button in my gara




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 16, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Replaced the mini belt without incident, actually pretty easy to do. Reinstalled the unit onto the screw and hung in place. Reinserted the wires by color and plugged in the power. The rack and connected...


Start over by removing the belt.

Release the door from the trolley.

Then slide the door/trolly latch mechanism toward the motor assy half way,

Reinstall the belt but not the door to the trolley.

Ativate the remote and where the door stops, assuming it is closing , is the lower/closed limit.

Remove the belt, again.

Then side the door latch mechanism near the end of the trolley.

Reinstall the belt and activate the remote.

It should be close enough to fine tune using the limit switches.

Jul 26, 2011 | liftmaster Chamberlain 20B17 Mini Drive...

1 Answer

HI, AFTER REPLACEING PLASTIC GEARS IN SAERS GARAGE DOOR O[ENER, OPENER WILL NOT GO THROUGH COMPLETE CYCLE. WHEN BUTTON PUSHED TO OPEN, OPENER GOES INTO CLOSE CYCLE AND HITS STOP BOLT. ATTEMPTED TO ADJUST...


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Mar 28, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I replace the internal gears on my Craftsman 1/2 HP opener. after re-assembling it. i tested the opener the door raised only half way and would stop. it would start down but stop also. it would go only...


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.

Feb 20, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My craftsman automatic garage door opener made an odd humm noise after I pushed the button and it stopped opening. I helped it open up. after pushing the button again to go down, it just made the same...


Hello. Plug the motor back in but do not attach the door to the trolley. See if the motor runs the trolley up and down. Also manually run the door up and down a few times to check and see if there is anything binding. If there is binding, find the problem, often a loose wheel, also grease the track and lube the wheels with WD-40 penetrating oil. Finally, if the motor runs the trolley up and down with no problem but bawks when the door is attached to the trolley your motor is on it;'s last legs and needs to be replaced. J.

Jun 21, 2010 | Garden

1 Answer

Door goes up just past eye and stops. If I hold button down will go up all the way. Must hold button down for down position also or stops every couple feet.


Check your door springs and also remove the cover and check the drive gear. It is a white nylon gear just in front of the motor and may be stripped. You need to check your door sensors also. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit if necessary.

Mar 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I recently replaced the gear drive on my craftsmen chain drive opener. However, now the opener only moves a couple of feet and then returns back. adjustments dont work. What is the problem?


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.

You should also loosen the chain enough that you can remove it from the sprocket above the motor. Now with the door closed and everything else attached run the motor until it runs clockwise and stops. Replace and tighten the chain. Some adjusting of the up and down limits will be required.


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

1 Answer

Stripping plastic drive gear in Chamberlain opener: Won't lift


If you are a do it yourselfer you can do it. The new part can be bought at any good door opener company and they will most certainly have them on the shelf. The part should come with a set of instructions. Don't let them sell you a part without the instructions. The part number is 41A2817 Drive Gear. If you do find the job is to much for you they will gladly install it for you for the labor costs. One plus is that they will also check and service the door for you. Door maintenance gets overlooked most of the time.

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

4 Answers

CRAFTSMAN GARAGE DOOR OPENER PROBLEM


i have a garage door opener craftman 1/2 hp model 13953985 the light is flashing 10 times . now you have too hold down on the button to raise and lower .

Feb 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

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