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Do you need to wind the bobbin? If you just need put in the bobbin, make sure that the needle is in the highest position and that the presser foot is up. Slide open the cover by moving it towards you. Pull about 4" of thread from the bobbin and hold the bobbin such that the thread is coming off in a counter-clockwise direction. Put the bobbin into the bobbin case and secure the thread in the notch near the center bottom of the bobbin case. Next guide the thread into the notch to the left (near 7 on an analog clock). Hold onto the thread and slide the cover closed. To bring up the thread, make sure that the needle is threaded as well. Turn the hand wheel slowly towards you while you hold the needle thread with your left hand. Turn the wheel until the needle comes back out of the needle plate. Pull gently on the needle thread. You should see a loop of thread around the needle thread. Gently untangle this loop until you get to the end of the bobbin thread. Pull the needle thread through the opening on the left side of the presser foot. Then pull both threads to the back of the machine.
Possible causes: (in order of likelihood)
1. Needle inserted wrong (backwards or not in all the way)
2. Bobbin inserted wrong (thread unwinds in wrong direction)
3. Wrong bobbin type (wrong class or size)
4. Macine timing if off and needs adjustment
have you tried changing the needle? usually flat side goes to the back of the machine rethread the machine top & bobbin make sure the bobbin is inserted correctly into the bobbin case clean under the needle plate & in the bobbin area for lint or loose threads try these sites about timing youtube fixsewingmachines.com sewusa.com
If you have the black bobbin case you must make sure you use only a good mercerised thread, there should be enough gap between the edge of the bobbin case and the silver adjuster to allow the thread to pass through, if there is not then you must slacken off the two screws and move it over a fraction.
Or you can get one locally, its called a "Singer Apollo bobbin case". Also don't forget to add a drop of oil at the meeting of the bobbin case and the outer hook (silver circular part that picks up the thread)
When they break, it leaves a bur sometimes and it will cause thread breakage/jamming.