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

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Craftsman - chain drive. now open won't travel more than 1 ft.

Door is open. In closing the chain travels about 1 ft., stops and reverses. The infared safety beam is o.k. The behavior is the same even if the door is detached from the chain.

thanks patrick

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Sounds like you have a bad RPM sensor board. This is a small printed circuit board just in front of the motor.

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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As you push remote door travels a shot distance stops,push button and travels short distance again and again. What is wrong?


Most common failure is internal plastic gear. If we assume that this is the failure i would suggest disconnect the travel engage latch to the non engaged position. Cycle the door and observe if there comes a time that the motor is humming and the chain or latch is not moving. Other than reversing for just a brief moment at the end of travel at no time should the motor hum as turning and the latch feature not move.

What I suspect is happening in the down direction door wants to close and as the gear rotates the gear slips . This repair is not so difficult for the DIY with some mechanic skills and tools. Lots of u-tube showing you how, Parts are available. Confirm the right part for your specific model. Purchase the gear and shaft as an assembly if you not sure about the difficulty. Part prices are all over the map. Shop around. You can buy just the gear a little more difficult to replace.




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His 15 minute estimate may be a little optimistic.
Craftsman LiftMaster Garage Door Opener Won Open or Close Fix the Stripped...

Jan 10, 2016 | Building Materials

1 Answer

We have installed the craftsman garage door opener and have continually adjusted the up and down travel limits and the door will not stay down


try adjusting the down force. the force necessary to may it reverse. it may be set too light. increase the down force and see if that helps. usually screw in back of unit. and usually labeled.

Jul 24, 2015 | Craftsman Garage Door Opener 1/2 HP Chain...

1 Answer

Craftsman garage door opener #139.53985 The door reverses in the fully closed position. I can not decrease the down travel limit by turning the adjustment screw clockwise. Please comment regarding a...


TAKE OFF THE COVER & SEE IF THE LIMITS ARE WORKING CORRECTLY.

IF THEY ARE AND THERE IS JUST NOT ENOUGH TRAVEL YOU MAY NEED TO REMOVE THE CHAIN AND REINSTALL IT 4 OR 5 LINKS OVER THIS WILL INCREASE THE LIMIT.

HOPE THIS HELPS

Jun 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener won't close. travels 6-8 in.,


If you cannot get the light on the sensor to come on by tweaking it,making sure it is pointed at the other sensor and your wiring is not broken or shorted then your sensors need to be replaced.

Jan 08, 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...

1 Answer

Craftsman garage door opener won't close completely


look on the side of the openeer usually lekt looking at it from the rear theese are your travel adjusters one turn = 2" travel normally

Jan 07, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears Craftsman 3/4


Open up the caseand look at the travel assy. Sometimes the limit (up or down) do fall off the assy. Just snap it back on.

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

1 Answer

Opener will not reverse


FIRST YOU NEED TO RESET THE CHAIN .

Unplug power
Release the door from the opener close the door manually. take the chain loose and slide the traveler down to reengage with the trolley. Plug in power, run the unit with chain off untill it completes a clockwise cycle and stops. reconnect the chain and set tension.

Adjust the chain tension.

If it still moves 6-8 inches and flashes 5 times. the problem is in the rpm sensor.

Full diagnostics are in the owners manual - FREE at
http://help.chamberlain.com/help/en-us/InstructionManuals

Oct 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

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