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

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Craftman garage door opener closes via the key pad and immediately reverses and reopens. have adjusted travel limit as well as force. Any suggestions

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If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors or the wiring to them.

Posted on Oct 12, 2010

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Genie trac drive


Over time, grime gets into the tracks, lubricant gums up in the rollers, and more pressure is needed.

On the ceiling mounted motor unit, there should be a pair of adjustment screws.
On my LiftMaster, they're labeled "OPEN FORCE" and "CLOSE FORCE".
These will increase the force exerted in the respective direction.
Make sure you are not adjusting the two screws that control the travel limit.
Adjust a LITTLE (like 1/8 to 1/16th of a turn at a time) and test before adjusting further.

Oct 07, 2013 | Building Materials

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New Sears craftman 1/2 horsepower garage door opener not staying closed, trolley is hitting bolt stop and auto reversing.Have tried to adjust the down force and the distasnce down setting to no avail?


The 'down limit' on the side of the motor housing is what needs to be adjusted. Turn this control in the opposite direction of the arrow printed on the cover. I usually adjust this so it stops short by quite a bit and then fine tune it.

Oct 15, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door reverses after fully closing, how do I determine if problem is due to adjustment to force or travel limits


If the door fully closes, the travel limit must be adjusted, as you suggested.
If the door were to open before fully closing, that would be too much rolling resistance.
Gary

Jul 12, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door loses travel settings after a day or two.Door closes then reopens after hitting the floor.I made the proper travel adjustments on the side of the unit then after 1 or 2 days the door hits the...


I have been having almost the same problem. My up limit setting is changing. I intend to replace the limit switch assembly. I know of nothing else that can cause this problem.

Dec 31, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have Craftsman ½ HP Garage Door Opener Model 139.18458D. It reopens immediately after closing. Sometimes it works normally, and sometimes gives this problem. I have tried adjusting the close force,...


It sounds like the door is traveling too far in the down direction. When it hits the floor the safety causes it to reverse to the open position. You need to adjust the 'down limit' not the force.

Sep 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My Craftsman garage door opener opens fine. It


It could be closing too far or the sensitivity could be set too sensitive.

Lube the springs, wd-40 rust may be the whole problem.

If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.

Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.

If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.

Hope this helps.


Jul 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2HP Door Opener won't stay closed


Loosen the chain and run the opener until the sprocket runs in the counter clockwise direction and stops. Now with the door in the open position replace the chain. This will get everything back into sync but I hope you remembered where all those controls were. You need to put them back in their original positions.

Jun 06, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

CRAFTMAN 1/2 HP OPENER


You say it only opens two feet?? Then closes?? If I may if you a little bit more costly option. Dont replace the gears. They used to be really good 8 years ago but the way they make the gears now there too soft and often strip out much faster. I would suggest that you do what we call a motor head change out. Take off your old chain drive motor head and buy a new one. Pretty simple. Two things though one always make sure you put the new one in with the door down. And the traveler in the down position ( The traveler is the metal thing hooked up to the chain) but far and your gear that you have it sounds to me that you dont have the gears close enough.. but 100 percent on that but a door should never close on it own. It's not safe.

Feb 09, 2009 | Sears Craftsman LiftMaster Chamberlain...

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