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

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Have a sears opener mdl 139.53325srt. replaced gear assemblies. after that the electric leads on the center screw will not stop the trolley when the contacts meet the fin on the screw.

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Make sure the wiring to the limit assembly is correct.

Yellow wire goes to the up contact.


Gray wire goes to the center contact.


Brown wire goes to the down contact.

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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Moter makes a skeeking noise


Check the track rollers. Lube if dry.
Check the trolley, lube as needed.
Check the long lead screw the trolley follows, lube as needed with lube for that type of opener. If it is in the motor housing, is it time for a new opener?

I had an opener that drifted in adjustment, that would go beyond the closed position a little causing the rail to bow upwards a little once closed, putting strain on the gearing shaft bearings and wore them out. I was able to order a package with the pinion gear, drive gear and sprocket and bushings, including the pulley for the opposing end in one kit.

Cautions...
-Disengage the trolley from the belt, chain or lead screw.
-Unplug the power before opening any opener covers and servicing anything inside the unit.
-Readjust the open and close travel positions

May 21, 2016 | Building Materials

1 Answer

1/2 horse garage door opener doesn,t open all the way. I need about a foot more lift. The tried a trolley stops before the stop limit..Therre is no interference. I Tried adjusting the up limit to no...


You said you adjusted the up limit already. Is it adjusted as far as possible? Usually the screw will become harder to turn. You mention a new door and spring but is the opener the same? My guess is you have a new opener as well and it is out of sync with the trolley. Try turning the up limit back and see if the trolley will stop shorter. If it does, loosen the chain or belt so that you can remove if from the opener's drive gear. Bring the trolley to your stop limit and put the chain/belt back on the gear. Adjust the chain/gear tension and try door operation again. If it was a sync problem, the door should close closer to your limit. Adjust up and down travel as necessary to fine tune it. This worked for me so good luck.

Sep 18, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Craftsman garage door opener (model 139.53637SRT - 1/2 HP) that stopped working. It sounds like the motor runs, but the chain and trolley do not move at all


The gears need to be replaced. You need
Chamberlain Sears Craftsman Liftmaster 41A2817 Gear Kit available on amazon for around 20 bucks

Jan 16, 2011 | Sport & Outdoor - Others

1 Answer

Garage door opens 1 foot, then stops.


It sure sounds like you have a broken door spring. While you are at it remove the cover and take a good look at the drive gear. It is white nylon and is just in front of the motor. Might be stripped and unable to take the weight of the door.

Jun 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Stuck garage door - Sears Craftsman 1/2 HP GDO, Model 139.18876


You have to sync the limit switch with the trolly. Take the small white piece off the bottom of the gear and sprocket assembly. Rotate the center screw on the limit switch until it is all the way up. Put the chain back on the sprocket with the trolley in the up position. Put the small white piece on the bottom of the gear and sprocket assembly. Operate the opener with the trolley dissconnected from the door. You will have to adjust the limit screws on the side of the opener accordingly.

Feb 13, 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

Help! chaimberlain/sears 1/2 hp door opener prob.


Fist, turn down the force settings to half. The force settings can damage the door when turned up that high.. Your problem is with the limit settings. This is the three white screws on the bottom with the cover off. You will have to take the bottom off the gear and sprocket assembly and place the limit in the position that the trolley is and adjust the other two screws accordingly.

Jan 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How is the chain supposed to be aligned


sync the motor. the gear kit tells you how. get motor up and position trolley near motor, assuming you left chain/cable attached to trolley). Get motor up by running motor and then pushing button again. if motor reverse, let it run and it will stop in up position.

Jan 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Sears Craftsman Sprocket replacement procedure


You need a gear kit. Amazon sells them. I got mine at a Sears Service center. Beware that you will need to completely disassemble your unit to replace the gears.

http://www.amazon.com/Sears-Craftsman-Liftmaster-Garage-Opener/dp/B000JGLX9C

Mar 31, 2008 | Sears Craftsman LiftMaster Chamberlain...

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