Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
My garage door will not open fully when I push the bottom on the wall. The problem started the door will only open a small amount when I push the button, but at that time I can push and hold the button to open it fully. Now even with push and hold the button it only opens about 2 feet.
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). If the light bulb(s) on your operator are on the 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
Tips for a great answer:
Open the garage door fully by pressing the wall control button. The bottom section of the door should be right at the header in the "full open" position. If it is too far back, the door cable can become misaligned. If it is not back far enough, you may not be able to get your vehicle in and out of the garage.
Position a stepladder behind the garage door opener motor. Locate the limit adjusting screws on the left side of the motor housing. Have a friend stand by the wall control button.
Insert a screwdriver into the slot for the "up limit" adjustment screw. Turn it to the right to decrease the door travel and turn it to the left to increase it. Turn the screw in small increments.
Close the garage door by having your helper push the wall control button. Notice the seal between the door and the floor--there should not be any light coming through. Adjust the "down limit" screw in the same way if necessary.
Operate the door by the pressing the wall button and check your adjustments.
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