Tip & How-To about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

Inspecting a garage door opener.

Use the pull cord and disconnect the opener from the garage door.

Operate the opener and let the carrier slide back away from the door.

Is the carrier moving smoothly when disconnected?

Operate the opener into the down position, does it run smoothly?

Next, lift the door by hand from the bottom to the top. Is it moving smoothly?

Run the door down, ensuring that it moves smoothly. If not, lubricate the axles of all the rollers on both sides of the door.

Check the cable pulleys at the top sides of the door channel, lubricate them as well.

Are the two cables in all four of the pulley grooves?

Are the cables hooked properly to the bottom of the door?

Now, connect the opener to the door and try it.

After checking those things, there is an "up force" and a "down force" adjustment on the opener, try increasing the whichever is needed by by turning the adjustment in the direction of MORE force.

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1 Answer

door only opens partially and stops.


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Gary

Jan 02, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

my garage door won't close ... starts to close but at different points it stops and opens again


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4.

Dec 31, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

When I activate the garage door moves up about 2 feet then just continues to go up and down as if stuck but there does not appear to be an obstruction


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Gary

Dec 19, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

When the temp gets colder, I seem to start experiencing trouble with my garage door. It lets up fine but when its time to close it, the lights flash quickly and will not close. what could be the issue??


I recommend this to everyone with garage door opener problems:

Use the pull cord and disconnect the opener from the door.

Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected?

Next, lift the door by hand from the bottom to the top. Is it moving smoothly?

If not, lubricate the hubs of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well.

Are all cables in all the pulleys, there are 4.

After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

Dec 08, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

GARAGE DOOR WANT CLOSE, USING CLOSER WILL MOVE A LITTLE BUT LIGHT FLASHES, SENSORS SEEM TO BE WORKING


I recommend this to everyone with garage door opener problems:
Use the pull cord and disconnect the opener from the door.
Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected?
Next, lift the door by hand from the bottom to the top. Is it moving smoothly?
If not, lubricate the hubs of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well.
Are all cables in all the pulleys, there are 4.

Dec 07, 2010 | liftmaster Chamberlain Garage Door Opener...

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