Singer 8280 (prelude) I had 2 threads coming out from my bobbin area, so I decided to open it up and take a look. I accidentally took out the whole bobbin shuttle. The manual doesn't tell me how to put it back together, it does tell me how to take it apart for cleaning. The actual bobbin is in the case & I wound it up. The case with the bobbin in it snaps onto the hook. But I can't get the bobbin holder and the hook to fit into the machine. The clips won't hold down the holder because something isn't lined up right..Help.

refer online on utube on 'singer installing a front loading bobbin case threading & insertion'

Is the knob on the side, where you loosen the needle to rewind the bobbin, tightened? Also, there may be some threads in the bobbin case messing things up. Unplug the machine if you are checking the bobbin case.

Make sure the bobbin winder is in the position away from the bobbin stopper. When you fill a bobbin, you have to push the "spindle" towards the handwheel. If you do not push the "spindle" back into position (away from the handwheel), the wheel will remain locked.

Remove the bobbin and look for bound up thread in and around the bobbin area. Another thing to check is if the motor still works.

It is in your top threading, try this test, rethread, now with the presser foot up, pull the top thread, it should feed smoothly, now lower the presser foot, it should barely move. Sometimes this seats the thread in the tension discs. Also, make sure that your needle is fresh.

change the needle
clean under the needle plate where the feed dogs are for lint
make sure the thread has not come off the thread take up lever
rethread the machine

Look it up at www.sewusa.com threading diagrams.
Rick

Yes they can indeed go out of time and breaking needles is the most likely cause. To solve timing problems you will need a sewing machine engineer though. The part which needs adjusting would be the area above the needle-the needlebar but it is a fiddly affair only to be attembed by someone who can repair sewing machines. It is also a fairly expensive repair as it is very time consuming. However-don't assume it is that. Firstly make sure the new needle is in correctly-the most common cause of problems is needles in wrong direction! If bobbin opens at front then the flat part of the needle faces the back. If bobbin area opens at side then the flat side of needle faces the body of the machine to the right. Check needleplate for damage so that new needle does not catch. File it smooth if you need to! Check you are using a good quality thread as cheap thread causes no end of problems. Guuterman is the best I found.

15 class bobbins

i think your putting in your bobin backwards,
to check put your bobin in and hold bobin , and bobin case by thread if it unrolls its backwards,
hope this helps!!