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If the top thread is not pulling up the bobbin thread, is it actually catching the bobbin thread? If not, then the machine may be out of time. Search for sewing machine timing or take it for service.
If it catches the bobbin thread but then the bobbin thread is difficult to pull, then possibly there is a snag somewhere that is catching the bobbin thread, the bobbin tension needs adjustment, or the bobbin case is incorrectly threaded.
Pull at least 6" of thread through the needle's eye and gently holding both thread tails gently when beginning to sew. Might try installing a brand new needle--make sure it is installed correctly. Raise the presser foot BEFORE threading the upper thread.
I'm sure you've done this, but I'll just throw this out there. Did you pull the bobbin thread through the groove that slants on the left side of the needle plate starting from the upper left corner of the bobbin cover?
Check the spindle the thread is mounted on and see if it\'s wrapped around it. Sometimes thread will catch and wrap around the spool spindle and break.
Check thread guides to be sure there are no nicks that might be catching the thread or damaging it.
Replace the needle.. a burr in the eye can cause upper thread to break. Needles should be replaced often, modern fibres can be hard on them, they get dull and that\'s no help for anything either.
Make sure the thread spool is mounted on the spindle with the thread coming off as directed in the manual. Some machines only work when the thread feeds in the right direction from the spool.
It can also be a tension issue.. tight upper tension or tight bobbin tension. Bobbin tension may be adjustable manually, but it\'s pretty rare for it be a problem. Upper tension, I don\'t know. I\'ve yet to get into computer machines so am not familiar with how they set upper tension.
But the mechanism that produces the tension can wear out or break and need replacement.
OK, Nylon thread and vinyl fabric are difficult. Try this: 1. Be sure your machine is *very* clean - no leftovers from previous projects. 2. Take the bobbin receiver out (need a screwdriver to hold the release), clean it and all around it and re-insert. When you re-insert in this machine, hold the release lever with the screwdriver, push the receiver away from you (under the feed dogs) then bring it back toward you so it catches before you release the catch. 3. Use a stitch length just a bit longer than you 'normally' would - 3+ for vinyl. 4. Wind your nylon thread onto a bobbin *very* carefully. It's easy to get it caught so that it won't feed evenly. 5. Be sure your upper thread is in properly, and that it doesn't catch on anything. 6. Adjust your upper tension tighter than 'normal' to accomodate the slippery thread your're using - do this a little at a time, it's easy to miss the 'sweet spot' if you adjust too much. 7. Be sure to bring up your bobbin thread and hold both threads as you start to sew - hold them for 3-4 stitches. 8. Sew slow - this machine can go *really* fast, but don't let it on this project. It will catch better if you take it slow and easy.
Hope all this helps. If not, you'd probably better take it in for service.
make sure to use every thread guide try a new needle make sure the bobbin is inserted correctly if these suggestions don't help & if the machine is still under warrenty take it back & let them check it
Try re-threading, make sure the presser lifer is up so the tension discs are open and the thread will go into them. It sounds like you may have missed either the upper tension discs or the take up lever.
A drop of oil on the hook wouldn't hurt if you haven't oiled in awhile.
Make sure your needle is in correctly. Check your threading again.
If that does not work, remove throat plate, install new needle, turn hand wheel until needle is at its lowest position and observe if the hook is exactly behind the eye of the needle. If that is correct then you do not have threaded correctly. If it is not then the machine needs to be re-timed.
I've just had this exact problem with my model 2037. The problem, according to 3 shops I've taken mine to, is that the shuttle hook (the metal piece that the bobbin sits in) is broken and needs replaced. Problem is, the piece is next to impossible to find.