Why does my Gutterman thread keep breaking on my 6600? I was told this was a good thread to use a Janome dealer?
Have you got the thread aerial up and using the thread cap on top of the spool of thread to ensure it feeds off smoothly. Also need to look at the thread spool, some of them have a little cut in the top where the thread end is placed to keep neat. If the thread is catching on this, just turn the spool up the other way and use the cap to hold thread away from the edge of the spool.
Gutterman is a good quality thread so you need to check that there isn't something in the thread path catching the thread and affecting the tension which is why it usually breaks. It could be a burr on the bobbin holder, the black plastic tensioning device which sits on a magnet. I have managed to damage 3 of these with my 6600P by trying to stitch too heavy weight seams, the bobbin holder moves and then the needle strikes it, once to the point of piercing right through it!
So have a look in the bobbin area, refer to your manual if you haven't removed the bobbin holder before. There is two little red marks that need to line up when it is in the right location. If you can see damage on the bobbin holder, you could take it out and try to file down the burring with a nail file or very fine grade sandpaper and then put back in again. The needle thread could be catching on a burr as it comes around during the stitch process.
Also, look at the top tension dial, turn it to zero and clean between the discs with the selvage edge of a clean piece of cotton waste. Then turn tension back to 5 and thread up everything and try again.
If you have tried all the above without success then perhaps take it back to the dealer and ask them to test sew it for you and see if they can spot the problem.
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