Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Ok let me try to tell you the problem I'll push door button to open door door opens about 18 inches then reverses maybe back 8 inches.So I'll push botton again samething happens over and over never closeing or opening all the way so you have to keep pushing button to get it back closed.This a 1/2 hp door opener Thanks for any help you could give.
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.
B. If the door runs fine then check the up and down force on your operator (the box that hangs from the ceiling and reads Craftsman). If the light(s) on your operator go from front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.
C. If this does not solve your problem the top bushing could be going out of your operator. Open the case and see if a lot of black filings are on the top of the big gear. If so the gear assy. will have to be replaced part # 41C4220A
Posted on Jan 04, 2009
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Posted on Jan 02, 2017
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Use the pull cord and disconnect the opener from the door.
Operate the opener and let the carrier slide back away from the door.
Is the carrier moving smoothly when disconnected?
Next, lift the door by hand from the bottom to the top. Is it moving smoothly?
If not, lubricate the axles of all the rollers on both sides of the door.
Check the cable pulleys at the top sides of the door channel, lubricate them as
well. Are all cables in all the pulleys, there are 4.
After checking those things, there is a "up force" and "down force"
adjustment on the opener, try increasing the "up force" by turning the
adjustment in the direction of MORE force.
Give me some thumbs up if this helps you.
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