Instead of secure stitch, the top thread gets stuck in the bobbin casing
SOURCE: Thread getting stuck in the bottom.
Mine is also doing this, but it has an auto tension and doesn't have those numbers on it. It is the 7422 Advance. I just bought this machine and have yet to be able to do anything with it. Very disappointed. Taking it back ASAP and never buying Singer again. Machine locks up for nothing, have to turn off and back on and it works, then the thread bunches up at bobbin and I have checked everything. And it was suppose to be able to accomodate a little bulk, (doing a quilted christmas stocking), however the fabric will not feed and it just starts to bunch up. Good luck
SOURCE: Upper thread wraps around bobbin mechanism, while sewing
IT PROBABLY IS THREADED INCORRECTLY. GO SLOWLY BY THE DIAPHRAGM AND MAKE SURE IT IS THREADED CORRECTLY. ALSO MAKE SURE SPOOL PIN HOLDERS ARE IN PLACE THAT HELPS TO GUIDE THE THREAD CORRECTLY.
SOURCE: Singer CG 550 Top thread keeps wraping around the bobbin and jam
Have you checked the top thread is correctly placed in the spring of the bobbin case?
SOURCE: Singer 3820 Bobbin Issues? I can't sew!
Unthread the machine completely, remove the bobbin.
Make sure that the bobbin case is securely in its place.
Turn the handwheel and ensure that the bobbin case is not jamming.
Turn the handwheel until the take-up lever is in the highest position.
Raise the presser foot and rethread the machine.
Chaeck the upper tension setting and set it around 5.
ALways make sure that you start sewing, stop sewing and thread the machine with the TAKE-UP LEVER IN THE HIGHEST POSITION.
Good luck!
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