Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
This started last winter, went away all summer and now as the cold sets in is back. The door stops opening half way up. If you start to put it down and then hit the up button again it will go past that point. As of this past week it now stops at 2 or 3 points on the way up. What could be causing this. I have greased the screw drive regularly and have inspected for burrs or screw damage and there is not any. It acts like there is a binding or dead spot on the screw motor but the seasonality is odd.
I had the same problem when it was cold the door would only raise a few inches and I had to keep pushing the opener numerous times before it would raise all the way.
On the back of the opener where the wires are connected there are 2 adjustment screws, one for up pressure and one for down. I increased the up screw and now it rsises all the way. Hope this helps.
Posted on Dec 10, 2008
Because I disengaged the door and the motor and chain continued acting up, I found the following:
The controls (potentiometers) that regulate force get dirty in time and make poor contact inside which become evident when cold as the contact springs separate from the track. Cleaning the inside of them is the solution, I injected 91% alcohol with a fine hypodermic (G27)needle through any spaces I could see leading to the inside of the potentiometers while turning them.
I suppose one can use any alternative electronics cleaner or the good old carbon tetrachloride.
I experienced a de-programing of the remote possibly due to wetness of of the board and I had to use a blow dryer to bring her back to function because I powered it while still wet; and reprogrammed it after. It works well now, I have too doors and fixed both the same way. Good luck.
Posted on Dec 27, 2009
I have the same problem also. i used silicone lubricant on all rollers and have moved the side rails away from the door.( my door would rub against the rails in cold weather) then i adjusted the up tension higher and that seems to have worked so far.
Posted on Jan 23, 2009
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Posted on Jan 02, 2017
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