|
| Hello, I have a problem with a Liftmaster 1040-6 Garage Door Opener. All of the sudden it stopped working due to a humming sound. I am pretty sure it's not the door because the same thing happens when the chain is disengaged from the unit.
I searched the net and a common cause of this seems to be a faulty capacitor, so we replaced it. Same thing. Then we noticed that the base plate that is attached to the motor and the worm gear 'jumps' about 1/8" as I press the open or close switch. The end result is that the worm gear won't engage with the main gear. If I hold the base plate down so it won't jump then the motor will actually run! Then we noticed the gear was worn so I ordered the kit and replaced it as well. Still won't work properly however. As a workaround, I actually made the unit work by placing a long screw in a way that will keep the base plate from jumping. At this point I managed to get the garage door opener working again. But I am not comfortable with this, it's not the way it's supposed to be and could be an indicator that something else is faulty. I suspect the worn gear is really a result and not the root cause of the problem. Just to be sure, I tested the safety reverse mechanism and it all works as it should, after a few adjustments. So again what I am trying to find out is, what could be the cause of this base plate/worm gear jumping just enough to not allow the gear to move? Thanks in advance |
Follow-Up Postings:
|
- Posted by don_1_2006 (My Page) on Mon, Jun 8, 09 at 10:14
| There are 4 screws that hold the motor assembly to the main housing. Make sure these are tight. They are installed from the bottom. Also there is a Motor shaft bearing kit that could be the cause of your problem. It is part number 41A2826. If the bearing was worn it could let the shaft shift. That is a Sears part number and may be different for a Liftmaster although they are basically the same machine. |
Please Note: Only registered members are able to post messages to this forum. If you are a member, please log in. If you aren't yet a member, join now!
Return to the Garages/Workshops Forum
Instructions
- You must be a registered member and logged in to post messages on our forums.
- Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review the contents and make changes.
- After posting your message, you may need to refresh the forum page in order to see it.
- It is illegal to post copyrighted material without the owner's consent.
- HTML codes are allowed in the message field only.
- No advertising is allowed in any of the forums.
- If you would like to practice posting or uploading photos, please visit our Test forum.
- If you need assistance, please Contact Us and we will be happy to help.