I've tried several bobbins tried new needles rethreaded machine can't think of what it could be , the top thread when starting the machine winds itself around the bobbin in the lower shuttle rather than sewing then the machine stops after the top thread breaks , I've tried the tension on different settings also ?
It sounds like the lower shuttle is out of place. You should be able to take out the bobbin case and unlatch the shuttle. It will probably be in 2 pieces. Clean out the dust behind it and replace the shuttle pieces. You may have to fiddle with it a little to get them back in place. Then you can test it by manually turning the wheel. Make sure the bobbin is placed into the bobbin case and that the bobbin turns in the direction that you pull the thread.
Good luck.
SOURCE: Top & bobbin thread will not sew
Most likely the needle is in backwards. Weird I know, I have no idea why but if the needle is in wrong, it either hits the bobbin and breaks or won't grab the thread at all. Good luck.
SOURCE: I have a Brother sewing
Check your top tension dial setting is on 5, as this sounds like the thread is not in tension fully so is looping up around the rotary hook and not being held back by the tension device. Is the pressure foot lowered (this turns the tension on) fully and is the thread through the tension discs correctly. Lower the pressure foot and pull the top thread from below the tension dial, it should feel firm to pull, if it comes out easy, its not undertension, device could be faulty and machine will need to be serviced.
Also, check that the bobbin case is fully inserted into the rotary hook in the correct position, bobbin is in and rotating the right way and thread is into the tension spring fully.
If you have the manual pull it out, and carefully check the threading up instructions and follow on your machine - it is probably one of these things causing the jamming.
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