I use this machine all the time...for many hours a day. The only time I have black fuzz is when I have used black thread and forgot to blow out the machine afterwards....
I hope you can find the problem, this is a fabulous machine....

I have this machine, and I've never had that problem.
Try giving it a real good cleaning.
Hope someone can help you. :)

yup, sounds like too much oil to me, too Check your manual and make sure you aren't oiling a hole that isn't supposed to be oiled also.

You might join the Yahoo Juki group and ask them. Very nice friendly group. http://groups.yahoo.com/group/TL98EJuki/

This is a really old post so I'm hoping someone somewhere has some info. This same thing happened to me. I don't believe it is oil from the machine as it only happens when using the walking foot. My machine (TL2010q) is less than a month old and is doing the same thing. I'm sure it's been doing it from the first use but I didn't notice until I was SITD on white fabric. Most of it came out in the wash but some did not. If I take the foot off the machine and cycle the lever that operates the upper feed dogs, you can see it drop a fine dust which smears on a light surface. Does anyone have any ideas?

I like your style!! You just powered through!! I guess it didn't damage your walking foot to set a land speed record? I'm going to give that a try.

I didn't use the walking foot to sew fast. I did clean my walking foot by soaking it in kerosene and let it air dry. Then put a few drops of oil on the moving parts.

I am on a Juki FB page and have seen this mentioned several times. It's a problem with the walking foot rubbing metal to metal and it's tiny metal shavings you are seeing. I have the TL2010q and haven't had the issue, but I think you aren't alone. A new walking foot might help (I've heard people mention a Janome one instead?) but google the issue (Juki walking foot metal shavings) and you will likely find some advice. Hope this helps.

Why are we getting posts from 10 years ago?