Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Chamberlain Belt Drive Opener Making Lots of Noise I just installed a Chamberlain the 'whisper quiet belt drive' opener and the motor unit seems to make a lot of noise.  It sounds somewhat like the teeth in the belt are rubbing somewhere.  I looked all over and still can't find the source of the noise.  It's actually louder than my old chain drive opener.  It happens primarily when the door opens but only sometimes when closing.  Does anyone have any ideas where to look?
Document: This was a replacement for an existing door opener (LiftMaster, sub brand of Chamberlain) so the mounting points were already there.I had hoped that this would be a simple replacement of the head motor unit (leave the existing belt and rail in place -- they were all in good condition). Not to be: the belt teeth are different and that translated into a lot of parts swapping if I were going to make this happen. Had to bail on that idea and go with a complete installation.
Took out a 5 year-old screw drive because it is under my son's bedroom and just too darn noisy. Researched like crazy to make sure that this one was quieter. Installed it. Had to use extension kit because I have an 8 foot door. Not happy that the steel track is 5 pieces jammed together. I can see how the motor flexes that steel when the door opens and that is SURE to make the opener noisy.
Since I was replacing a 22 year old Stanley chain drive (which got "zapped" during an electrical storm) I was not able to use much of the old installation. Also the ceiling mounting system for the motor was a make shift job and a foot shorter than this Chamberlain. Taking down the old unit and trying to use the old nuts, bolts and lag screws that were painted over (rather than making a trip to the hardware store) added some time to the job.
The belt drive on this unit makes a world of difference in vibration noise when compared to a chain drive or even a screw drive. I added a couple of rubber washers to the top mounting screws to provide further isolation... now when the garage door opens you can't hear it at all inside the house and can barely hear it running when standing in the garage!The exterior keypad is a really nice feature.
I paid a little extra to get the belt drive. I've always had chain drives, but live in a split level house now where the garage is below a bedroom. Of course, I wanted it to run quieter if possible. Unfortunately, the door is still noisy as the door moving up and down makes a lot of noise. I was disappointed that the operation wasn't that much quieter than the old chain drive I used to have. I also am VERY disappointed with the wireless range of the remotes.
Chamberlain makes excellent products. I would recommend to anyone needing a garage door opener. Belt drive model is quiet and smooth. Relatively easy to install if you are somewhat handy with basic tools. Installation instructions are comprehensive and easy to follow but don't skip any steps!
I've heard some people have had that problem.Good:-The belt drive is noticeably quieter than my old chain drive model.-The unit was pretty easy to assemble.-Once the opener is in and working, the door adjustments are easy to make.-It can support two 100W lights, so it's much brighter than my old single 60W bulb model.Bad:-The rail arm seems pretty flexible or flimsy compared to my old opener.
Replaced a Chamberlain chain drive garage door opener. This belt drive is a lot quieter. Easy to install even though it was longer than the one it replaced and there was a bulkhead in the way. No adjustments needed to the closing sequence.
I purchased this opener to replace an old Stanley chain drive that finally died after 30 years of opening and closing. I had read the reviews before making the purchase and was relieved that I didn't have to purchase any additional kits, like the one for 8ft doors. (My home is 40+ years old and the garage is thankfully 7 feet.)
Bought this for my new home. I have had a chain drive in my previous residence, but after seeing the belt drive Liftmaster at my dad's, I knew I wanted a belt drive. This opener is just as quiet as the $300 Liftmaster. The most noise comes from the old garage door. There is a slight hum in the motor, but can be barely heard if you are not in the garage.
Answer: no