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Hi I'm shawn I have a 139.655000 sears model it won't shut all the way. I tried adjusting chain and everything. If I adjust the arms to make garage door shut then it won't open all the way. Can you help?

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Sears garage door opener, chain adjustment

Loosen the inner nut on the trolley. (That is the lock nut). Then tighten the outer nut on the trolley to increase tension. The outer nut on the trolley is closest to the garage door. The chain tension should be 1/2 inch off the rail at midspan. (The chain is fastened to a threaded bolt on to the trolley. The threaded bolt has an inner and outer nut). Hope this helps.

Posted on Dec 24, 2008

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SOURCE: GARAGE DOOR OPENER

depends on how old, OLD units need to take cover off and adjust cam stops. Not easy if you have not done before,

Posted on Jan 15, 2009

  • 118 Answers

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

  • 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

  • 3197 Answers

SOURCE: need a manual for sears model 139.18856, 1/2

According to Sears your model number is bad. Double check the number and they will have the owners manual with complete installation instructions.

Posted on Sep 25, 2009

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1 Answer

Replaced a garage door opener (motor only) will only go downward a foot then back to the up position...tried the force button and the spring adjustment. why wont it work


Try this.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Oct 08, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Installed two new springs on automatic doorman model 455 and it won't close or open. chain will not move door where are adjustment screws? I think that may be the problem


Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

Sep 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

HI, AFTER REPLACEING PLASTIC GEARS IN SAERS GARAGE DOOR O[ENER, OPENER WILL NOT GO THROUGH COMPLETE CYCLE. WHEN BUTTON PUSHED TO OPEN, OPENER GOES INTO CLOSE CYCLE AND HITS STOP BOLT. ATTEMPTED TO ADJUST...


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Mar 28, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

New , just installed ; 3 feet from closing it stops. Does not reverse. I adjusted the up and down limits to no avail


It sounds like your chain needs adjusting. Try this.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.



Jan 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't open and close properly


Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


Jan 07, 2010 | 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 opens all the way only closes half way down


Hi,
Some of your comments look like they're missing but from what I can see you had to put chain back on and now the door doesn't close all the way.take the cover off and look at the limit switch,this the travel adjustment. The switch for the close side is making contact too soon so it shuts off early.You need to adjust contacts so its further away. Depending on where the trolley was when you reattached the chain, you might not be able to adjust it back enough.But try it first. If you still come up short you will have to take the chain back off and move the trolley back to where the door would be closed and reattach chain. now open position will probably need adjustment leave door unhooked and just let trolley move in case it over shoots the mark either way.

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

1 Answer

Garage door won't shut after changing gears


if you changed gears, you may have chain out of sync. read instructions with gear kit on how to sync chain.

Jan 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman door opener will not stay down


the sensor should shut door off whrn it reaches the closed position (adjust the shut off arm!

Dec 10, 2008 | Sears Craftsman LiftMaster Chamberlain...

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