I have rethreaded the top thread many times. Checked the bobbin for burrs, rewound bobbin and checked it to see if it is bent. Oiled the bobbin.
Where the bobin is at re check the exterior of the part that spins you may have a thread stuck and keeping it in place use a flash light then replace bobbin as you depress the power controller asist the wheel this should free up the bobbin area and should run
SOURCE: my singer sewing machines keeps jamming what can i do
check that the bobbin has not been bent
Oil it! Put a drop of oil on everything hat moves every eight hours of operation," except plastic gears etc". Use only Singer oil on Singer machines. Plastic gears require a grease made from plant.. "Do not use petroleum based oils or grease on your machine,it will dissolve the plastic gears etc". used in your machine..
Testimonial: "but the manual says do not oil this machine"
SOURCE: bobbin bunches up
Classic burr on the hook problem would be my first guess. If the thread remains on the hook when it makes the next revolution all sorts of ugly things happen such as you described. I made a video that might help.
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Thank you for the suggestion. I already used the flashlight plus a big flood light to check for loose threads, there were none. I used a brush to clean the area also. The wheel will not budge.
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