Okay, I spent 2+ hours on this, and finally came to the conclusion. It's not the powerbot, but the rubber brush, when it rubs against the wood it makes this noise. And that's why this noise doesn't happen with the brush off. And you don't hear it as much on carpet. I found out by just litterally putting my face right next to the powerbot. When you rotate the power bot using the remote in a way where it doesn't impede with grooves of the hardwood floor the noise stops suddenly, but when the powerbot is vacuuming in a way, the noise becomes louder. Kinda annoying but if it's this then I won't return the 7070
Hello, I have the same issue amd I used some silicone grease as suggested, but still have the noise. Where exactly am I applying the grease? What is the pulley surface you referred to. On the pulley the belt rides in? Do I remove the white pulley and grease there under there?
I know I am close to a solution I just need a bit more info.
I am having the same issue. It worked great for a month or so, then started with the rattling noise. Following in the hopes that I can figure it out. I got it for a Christmas gift and am very sad I can't use it.
Give this a try. If it does not help, send me a private message with your model code and serial number. http://bit.ly/2CGMMUe