Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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How do you shorten the chain on a garage door opener chain

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If chain is too long just take out links. You DO NOT have to go out and buy a chain breaker. If you have a Dremel or grinder, just grind off the top of the pin and punch it thru and you are all set.

Posted on Jul 08, 2012

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Find the link and remove as much as needed replace the link.

Posted on Jun 19, 2009

  • albert getty
    albert getty Jun 19, 2009

    find the link and remove as much as needed replace the link.

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SOURCE: Garage door opener chain out of sync with door

There are two white screws on the sides that adjust the limits. Adjust the "down" screw less. You should have to turn the screw 4 full turns for eight inches. After you make this adjustment, test it without the door being hooked up to prevent damage to the door or opener if it tries to close too far.

Posted on Mar 01, 2009

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1 Answer

I need to take out some links in the chain on a liftmaster garage door opener. How do I do this? It is about 20 months old.


Two ways!

On the cable section of the chain use a cable shorten-er.

On the chain remove excess chain and install a master link/
26357047-x15jo43ndspuozxlydbahatb-3-0.jpg

26357047-x15jo43ndspuozxlydbahatb-3-2.jpg Master link/ You would need to go to a bicycle shop to have the chain shortened.

26357047-x15jo43ndspuozxlydbahatb-3-5.jpg Check to make sure you can not extend the rail before cutting chain. The cable shorten-ers will likely be available at an auto parts store. They are used to adjust the parking brake!

HJope this helps?

Nov 15, 2016 | Building Materials

2 Answers

Cannot open my garage door manually after I disengage it from the garage door opener (chain drive)


They are not light weight but there is no reason if the motor can raise it, then you cannot raise it by hand.

Feb 05, 2016 | liftmaster chamberlain 1/2 hp chain drive...

1 Answer

Don't know Mod. No. lost installation manual, approx. 5 yrs. old Need installation manual.


About 496,000 results (0.43 seconds) Search Results

    [PDF]GARAGE DOOR OPENER Model 3265 1/2 HP ... - LiftMaster

    www.liftmaster.com/.../en.../tucmanuals/114a3044.pdf Chamberlain GroupFasten the manual near the garage door after installation. .... This garage door openerhas been designed and tested to offer safe service provided it is installed, ...

    Manuals Download Craftsman Garage Door Opener Model ...

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    CraftsmanCraftsman has the best selection of Garage Door Openers in stock. Get the Garage Door Openers you want from the brands you love today at Craftsman.

    Craftsman 1/2 HP Chain Drive Garage Door Opener - Sears

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    Craftsman1/2 hp Chain Drive Garage Door Opener Opens by Remote, Inside and from Car Enjoy a great end to every day by ... Owners manual - English (Warranty).

    Free Craftsman Garage Door Opener User Manuals ...

Feb 03, 2016 | Building Materials

1 Answer

How do I update software


About 496,000 results (0.43 seconds) Search Results

    [PDF]GARAGE DOOR OPENER Model 3265 1/2 HP ... - LiftMaster

    www.liftmaster.com/.../en.../tucmanuals/114a3044.pdf Chamberlain GroupFasten the manual near the garage door after installation. .... This garage door openerhas been designed and tested to offer safe service provided it is installed, ...

    Manuals Download Craftsman Garage Door Opener Model ...

    www.craftsman.com/search=manuals%20download%20crafts...

    CraftsmanCraftsman has the best selection of Garage Door Openers in stock. Get the Garage Door Openers you want from the brands you love today at Craftsman.

    Craftsman 1/2 HP Chain Drive Garage Door Opener - Sears

    www.craftsman.com > ... > Garage Door Openers

    Craftsman1/2 hp Chain Drive Garage Door Opener Opens by Remote, Inside and from Car Enjoy a great end to every day by ... Owners manual - English (Warranty).

    Free Craftsman Garage Door Opener User Manuals ...

Feb 03, 2016 | Kenwood DNX-690HD eXcelon DVD Receiver...

1 Answer

Shorten chain on chamberlin garage door opener


There is a special tool for this and is available at bicycle shops. Easy to use.

Nov 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Might need to shorten the garage door opener-can't locate manual


Need a manufacture and model number here to help you. Why do you think it needs to be shortened?

Jul 06, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener model 139.53615sr. can i


You can buy the chain and cable assembly at any good door opener service company. I doubt you will find aftermarket though.

Nov 29, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door chain is sagging


If the chain is adjusted properly the chain will sag slightly on one side when the door is closed and on the other side when it is open. It should not sag enough that it is dragging on the T-rail. You can adjust it at the trolley. If you over tighten it you will hear a clicking sound when the opener opens or closes.

Jul 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door opener (chain) motor runs in reverse. Trolley slides forward trying to close door, even though it is closed, instead of sliding toward motor to open door. Happened out of the blue - was


Loosen the chain enough that you can remove it from the sprocket. Run the opener until the sprocket turns counterclockwise and stops. With the door in the open position replace the chain. You will probably need to adjust your open and close limits per your owners manual.

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

1 Answer

Garage door opener chain out of sync with door


There are two white screws on the sides that adjust the limits. Adjust the "down" screw less. You should have to turn the screw 4 full turns for eight inches. After you make this adjustment, test it without the door being hooked up to prevent damage to the door or opener if it tries to close too far.

Feb 27, 2009 | liftmaster Chamberlain Garage Door Opener...

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