I believe the timing is off - when the needle comes down it hits a part beneath the bobbin and breaks. I took it in for repair and it came back doing the same thing. They said it is a "timing issue". There are no singer repair centers in Colorado and the place I was using was forced to close with 2 days notice by the bank!
1.Remove the machine needle plate.
2. Remove the bobbin case.
3.Insert a new needle.
4.Turn the handwheel towards you by hand, and watch the
needle going down.It should go down all the way, and start coming Up again, WITHOUT TOUCHING ANYTHING.
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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.
I don't know if this will work, but sometimes the thread in my machine gets too tight because I hold it in place with a water bottle cap, but then my needle gets pulled too far away from where it is supposed to go, and it bends and hits the bobbin plate, and then it just breaks.
Hi, actually I can help with your problem but maybe you can help me with mine. A friend gave me the same model...without the instructions. Would you be willing to give me a pdf scan or photocopy of the manual, please? Let me know at firstname.lastname@example.org. Thanks!