Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I have liftmaster door openner, I replace the gear sprocket kit. Because the gear was striped, the motor was running and nothing was happening. It work OK for two weeks, and now the same thing is happening , what could cause this to happen? Oh the door works freely by hand. Thank you

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  • marty metzger May 11, 2010

    Did you lube the new gear?

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DID YOU REPLACE BOTH GEARS???
MANY TIMES PEOPLE ONLY REPACE THE EASY ONE - THE OTHER ONE IS VERY HARD TO DO
THE WORN GEAR WILL CHEW UP THE NEW GEAR AND YOU HAVE THE PROBLEM ALL OVER AGAIN.
ALSO IF THE CHAIN OR BELT IS TOO TIGHT IT CAN DAMAGE THINGS BUT USUALLY NOT IN TWO WEEKS.

HOPE THIS HELPS

Posted on May 28, 2010

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With my door closed, i push door button to open and the chain and opener continues inthe closing mode. any help?


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    Searsmore info. + -. Chamberlain LiftMaster 41C4220A Gear & Sprocket Assembly Kit. $31.40 ... Chamberlain Sears Craftsman Liftmaster 41A2817 Gear Kit. $27.65 ...

Jan 10, 2016 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How much is gear kit for 1/2 #41A2817?


Gear kits can be purchased for chain drive machines from any of these 3 brand names ...Liftmaster/sears craftsman /chamberlain / All 3 of these brand names are manufactured by Liftmaster the worlds largest maker of garage door openers and related parts ! You can purchase a gear kit on ebay for around $30 or less depending on the seller ! If you go to garage door parts sites it will be slightly higher so your best bet is EBAY , The gear kit only requires the main gear and sprocket housing that attaches with 3 screws , just remember after the gear is installed that you run the motor co that the trolley starts in the door down position otherwise you risk having the trolley smack into the opener , this is crucial for any travel adjustments that are made later! Hope this helps you ,sincerely Glenn

Feb 04, 2015 | liftmaster Garage Door 1/2 Hp

1 Answer

I installed a sprocket and gear assembly kit to the garage door opener. It runs forward and then quickly runs backwards. Tried to adjust sensors and the motor does the same thing. Goes forward for a bit...


Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.


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

1 Answer

The door only moves 15 inches in each direction. I just installed a new gear kit.


Loosen the chain enough so that you can remove the chain from the sprocket above the motor. Run the motor until the sprocket turns in the clockwise direction and stops. With the door in the closed position replace and tighten the spring. This will get everything in sync and you will most likely need to tweak the 'up and down limit' controls to get it just right.

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

1 Answer

Garage door opener motor runs, but the chain drive doesnt turn


If the chain is not moving and the motor is – you need a gear kit.

Unplug the unit - take of the cover – you will find white shavings inside – these confirm the diagnosis. .

Get the gear AND sprocket kit.

It’s a good DIY project but you MUST VERY CAREFULLY Follow the instructions step by step.

HOPE THIS HELPS

Mar 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Hod do I align the sensor lights?


Your problem is not with the safety eyes. You have a stripped gear inside the opener. Take off the cover and you will have white shavings in the bottom of the cover. You can repair this with a liftmaster gear and sprocket kit.

Mar 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

3 Answers

Motor runs but door does not open


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

Feb 01, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Lift master garage door opener. Motor makes noise when switch is hit likes its running but chain/sprocket doesn't move and the door is stuck open. Chain is on sprocket. Not sure if the motor is frozen? ...


I had the same problem. Took the cover off of the opener and found that the gears were stripped on the unit. Motor was fine. You can order gear replacement kit for the unit. They are a plastic type sprocket and worm gears. The kit comes with spindles and all necessary clips. You have to take the unit off the ceiling to replace the gears, but the process if very easy to do. Parts kit about $40 on line, much cheaper than a new door opener. Total process took less than 2 hours, including getting the unit down and back up again.

Jan 24, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

How is the chain supposed to be aligned


sync the motor. the gear kit tells you how. get motor up and position trolley near motor, assuming you left chain/cable attached to trolley). Get motor up by running motor and then pushing button again. if motor reverse, let it run and it will stop in up position.

Jan 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

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