My Husqvarna diamond top thread keeps breaking while doing loop embroidery. It sews a couple of stitches and then you can hear when the thread breaks. Ive tried changing the needle and bobbin, and cleaning...
Primary causes of upper thread breakage:
-- misthreading: pull all the thread off and thread again, using the manual, step by step. Read each step aloud before you do it. (sounds dumb, but helps.) (And make sure you thread the takeup lever!)
-- thread has wrapped itself around a thread guide or spool pin from one of the breaks. Take the spool off the machine before rethreading.
-- bad or damaged needle. Replace with the right size for the fabric, turned correctly (backwards needles skip stitches)
-- dirty machine, especially in the bobbin case area: review cleaning instructions and do it, using brush and vacuum only
-- bad/cheap thread: should not be slubby or break easy. Try another spool.
-- top thread tension too tight. 4 is normal for most fabrics, most stitches.
1) do a light cleaning (brush and vacuum) every day you sit down to sew.
2) replace the needle if you hear it hit metal, if you've got a really bad thread jam, if you see it deflect as you sew (for instance, sewing over the side seam on jeans when hemming). Replace every 3-8 hours of actual stitching time anyhow.
3) buy good quality thread
4) when your machine isn't sewing right, stop; take all the thread off of/out of the machine (bobbin out of bobbin case, spool off spool pin) and give it a quick cleaning. Rethread from scratch, carefully. If that doesn't fix it, do it again, then replace needle and rethread one more time, manual in hand (yah, even if you've threaded it 8 million times before). #4 is curative about 98% of the time. The other 2% often requires professional attention.