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

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I need a wiring diagram for a Craftsman model 139.53990 3/4 hp garage door opener. Can't get it from Sears.

I took it apart to replace the gears. Several wires came off unintentionally. Should have tagged the other wires but didn't. The wires in question are those on the two run capacitors and the motor itself.

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Posted on Jan 02, 2017

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SOURCE: Sears Craftsman Garage Door Opener Wireless Keypad Model and a LiftMaster Chamberlain Professional Garage Door


I had the same frustrating dilemma with my Craftsman LiftMaster garage door and Keypad, Model 139.53754-01 (dated 10/06; and has the # 315 MHz).

To resolve “the dilemma”, grab your keypad, climb up on a ladder to access the garage door opener’s motor unit. On the right side of the motor unit, remove the white plastic casing by pressing buttons on each side and pulling down. This will expose the programming area, and for our purposes, the “Learn” button.

1. On the motor unit, press and release the “Learn” button. The Learn indicator light will glow steadily for 30 seconds.

2. Within 30 seconds, enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold the ENTER button.

3. Release the ENTER button when the motor unit lights blink. The code has been “learned”/stored/activated.

Good Luck, and I Hope this Helps!
For possible future reference:

How to change an existing, known PIN
(Changing an existing PIN can be done with the wireless remote keypad, and does not require access of the motor unit.)

From the keypad:

1. Enter the four digits of the present PIN, then press and hold the # button. The opener light will blink twice. Release the # button.

2. Enter your new 4-digit PIN and press Enter. The motor unit lights will blink once when the PIN has been “learned”/stored/activated. Test by entering the new PIN, and pressing Enter.

Posted on Jun 24, 2008

  • 118 Answers

SOURCE: motor runs but door does not open

you have a stripped gear on your opener. Replace gear and sprocket kit

Posted on Feb 08, 2009

  • 1 Answer

SOURCE: Sear 1/2 HP Garage door opener with replaced gears

The actual problem is after power on the opener, its initial state is uncertain. It may be in ready to close or ready to open state.

If the garage door is in closed position, likely the opener will still try to close it, because its initial state is uncertain. That's why you guys see it travels 2 seconds and reverse.

In order to fix this problem, after you power on the opener, do NOT hook up the chain, and do NOT mount the sprocket cap(so you can see the sprocket travel direction). While you watch carefully at the sprocket, press trigger button on remote control or ask someone press wall control button. Make sure the sprocket turns clockwise and stop. If the sprocket turns counterclockwise, press the control button again, so it will turn clockwise. Let it finish clockwise turn. At this moment, the opener is in ready to open state.

Cover sprocket cap and hook up chain. Mount door bracket and adjust. Your door must be in close position.

You are ready to go.

Posted on Mar 07, 2009

  • 1 Answer

SOURCE: How to reprogram Sears Mult-Function Keyless Entry garage opener

On the garage opener that actually opens the door the one on the ceilling has a green or orange button that is called the learn button just press and release it you have 30 seconds to punch in a 4 digit code and when your done press and hold the enter button until the lights on the garage open blink once or twice then just press the code again and it will open the door press enter once to reverse the effect and and twice to stop the door completely.

Hope that helps

Posted on Mar 17, 2009

  • 10865 Answers

SOURCE: need part 41A2817 drive/worm gear kit for Sears

as long as the door is less than ten years old, sears will stock the part you need. you can contact them through this link.

Posted on Apr 22, 2009

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Hope this helps

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