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

4 Answers

CRAFTSMAN I have a Craftsman 1/2 HP opener (no safety photo cells). I just replaced the worn out gear, and put everything back together again precisely. Now when I try to operate the unit, it runs find but one for one second. then it stops, and goes into reverse for one second. It does this with the chain attached, or without the chain attached. No adjusting of any kind changes it. It just runs one second one way, stops, and runs one second the other way. I have busted my brain trying to figure out the problem and have double/tripple checked everything. Someone please help.

Posted by on

4 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 19,396 Answers

The Craftsman HP openers will go automatically to reverse if it does match too much resistance.
If the opener goes to reverse it is because it had been not properly assembled ad geard are not running, the opener stops and start reverse for a couple of seconds.
The opener should be taken apart and re-assembled.

Posted on Feb 18, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 326 Answers

Check out whether you have fitted the gears properly.it will be upside down.just make it proper and check out again.

Posted on Feb 05, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 5,158 Answers

Sounds like the safety switch needs adjustment... it thinks it's hitting something so it stops

Robert

Posted on Feb 05, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,110 Answers

You may have put the chain back on out of "sync" with in internal up and down stops. You may have to take the chain off the motor sprocket and run the motor to make sure it is stopped in the down position ( watch the rotation of the sprocket to determine up or down position) When the motor is stopped in the down position put the chain back on with the chain Carriage in the down position. Then you can fine tune the up and down stop positions with the adjustment screws on the side.

Posted on Feb 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1/2 hp craftsman door opener moves about 12 inches then reverses back & thats all it will do. just replaced the main two plastic drive gears whenthis started


First try adjusting the force limits. They are up on the motor head. If this works do a 2x4 safety reversal test afterward. It also may be the rpm sensor. Sometimes this can go out with the gears. There is an led light on the motor head. If it is flashing 5 times in a row then it is this for sure. You can get replacement parts at searspartsdirect.com. Thanks BB

Sep 19, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman 1/2 hp chain drive starts to close approx 12" then returns to open. replaced main gears 2 weeks ago everything was working. now its about 6" from full open and will only travel 12" then returns...


Make sure you put the black cup back onthe 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 theissue, then you probably did not have the motor shaft pushed all theway back when you tightened the coupler after replacing the wormgear. Loosen that coupler up and from the front of the motor(opposite end in which the coupler is on) push the shaft back as faras it will go. Hold it there while you tighten the coupler back upand then try it.

Mar 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Stripped big gear in craftsman 1/2 hp 11 years


The part number is 41A2817 and is available at any good door opener service company. It comes with instructions.

Jan 17, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Garage Door Wont Close Craftsman 1/2 HP (1998)


What it is is the electric beams at the door are getting blinded buy the sun or out of line. They are the two black boxes on both sides of the door about a foot from the ground. Put a piece of card board in front of them not blocking the beam dut to block the sun. All that they are is safety beams for kids so they do not get hurt. If you have to move them to the top where the sun will not hit them. Sorry to say though you can not remove them all the way. Also make sure the lite on them is not blinking if so they are out of line.

Good Luck and Please Rate FixYa!

Mar 03, 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...

1 Answer

Garage door opener motor doesn't work.


2 flashes is a safety eye issue, but you problen is most likely that the chain is not sync with the limit setting. Take the bottom off the gear and sprocket assemble and rotate center limit srew until it is in the same position as the trolley.

Jan 26, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door opener will not opern


2 flashes indicate safety eye issue. Check you wiring and make sure it is wired correctly and check to make sure the eyes are properly aligned.

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

1 Answer

GDO repair


If unit is pre 1993 (Safety beam era), Sears will not sell you any parts. Google Liftmaster gear kit. Buy for $25-30. Not hard if you are handy. Buy the complete kit with bearings.

Jan 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

Not finding what you are looking for?
Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+ Logo

Related Topics:

23 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sears Garage Doors Experts

Al Clark

Level 2 Expert

290 Answers

Cindy Wells

Level 3 Expert

4751 Answers

Pieter Vleeshouwers

Level 3 Expert

1410 Answers

Are you a Sears Garage Door Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...