Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer

My chain drive GDO will only work if i help it...

I have a 1/2 HP Craftsman opener. It will only open or close if I help it along. The motor sounds like it is being jammed, but works just fine if I push up the door or pull down on it. Any thoughts? Thanks in advance.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 173 Answers

The motor will need rewinding, and the condensor will probably need replacing.
That should do it:)

Posted on Jul 27, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Chamberlain chain gdo. goes all the way up until it hits gdo box and gets stuck. unstick it and it works for awhile then it happens again


Unstick it and close the door. While the door is closed locate the 'up limit' control on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover. Should be good to go.

Oct 15, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

My 20 yr. old Craftsman 1/2HP chain drive GDO (139.18590) will click and hum for a second but the door doesn't move when I press a remote or wall console. The door moves freely manually and I checked the...


If your door is stuck in the open position the trolley is most likely jammed against the bolt just in front of the motor unit. You should be able to loosen the chain enough that it releases the pressure on the trolley and then close the door. While the door is closed, locate the 'up limit' control which is on the side of the motor unit. Turn this control 2 full turns in the opposite direction of the arrow printed on the cover and then tighten the chain.

Feb 21, 2010 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

My older Craftsman garage door opener comes down about 6" & then goes back up. I just replaced all the rollers o& the opener worked fine. Then I tightened the chain on the opener & it worked ok...


If the main light flashes 10 times when the door goes back up it is a door sensor problem. You chain should sag just a little. If you tighten it too much it will click as it goes over the sprocket. You can increase the down force which is an adjustment near where all those white wires go. A 1/4 turn should be enough. Release the door from the opener and operate it by hand. It should move freely and when you have the door approximately waist high it should stay put. Neither raising nor closing.

Jan 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Have replaced drive gear on Craftsman GDO. Everthing engages and chain moves but door only opens 3 inches are so. Have ajusted opening cointrol on side to max and only 3 inches. When I unlatch GD from...


Loosen the chain enough that you can remove it from the pulley on top of the motor unit. Now with the door closed run the motor until the pulley turns in the clockwise direction and stops. Put the chain back on the pulley and tighten. You may have to tweak the up and down limits now.

Nov 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

1/2 HP Craftsman Garage Door Opener works but lights don't


I think you are saying that normal incandescent bulbs do not work. If that is correct you should unplug the unit and using a small screwdriver reach into the socket and pull out slightly on the center contact.

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

1 Answer

Liftmaster gdo won't operate with door or remote


Hi there, when the problem first started was the door being used frequently? If your GDO was used quite a few time's in a short period of time the "overload" may have triped. The makers of all GDO's now adays install an overload witch is an electrical safety device protecting the motor. This prevents over heating in turn burning up the motor. To rectify unplug for 15-20 mins. If you have Model number 1270 turn to pg. 7 in owners manuel. Insure all door locks are free. Insure power to electrical outlets by pluging desk lamp in same out as GDO. what model do you have?

Mar 17, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

How do I disconnect my opener and manually open my garage door?


Check up by the motor. There should be a latch you can pull down that will disengage the chain from the door. After that, just pull the door up or down as needed.

Feb 11, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman GDO Will not close


readjust the sensor controls on the side of the unit

Dec 28, 2007 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Garage Door doesn't close


I have this same problem periodically. I fix it by manually closing the door and then letting the truck re-engage the door and everything is fine......unitl next time.

Sep 18, 2007 | Sears Craftsman LiftMaster Chamberlain...

Not finding what you are looking for?
liftmaster Chamberlain Garage Door Opener Transmitter 300MC Logo

Related Topics:

92 people viewed this question

Ask a Question

Usually answered in minutes!

Top liftmaster Electrical Supplies Experts

Vince Heuser

Level 2 Expert

118 Answers

tamska1102

Level 1 Expert

28 Answers

ray gallant

Level 3 Expert

41407 Answers

Are you a liftmaster Electrical Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...