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Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.
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Install a brand new needle (make sure it is compatible with the thread and fabric). Remove the top thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning. Verify the thread path is correct. Set the top tension to the midway point and retest your machine. Tweak the top tension until the top and bobbin threads meet in the middle of the fabric.
Install a brand new needle and confirm that the needle is correct for the thread and fabric you are sewing.
ALWAYS RAISE the presser foot and rethread from the beginning. Set the top tension to the midway point. Verify the thread path is correct.
When the presser foot is raised, the thread should pull through with very little resistance. Once the presser foot is lowered, the tension is activated and the thread should not pull through.
It could be the thread is catching a notch or groove. I have a machine that the thread has worn a sharp groove in the finish. I covered it with tape. Fixed.
possibly the top thread is being restricted in movement
check that the thread is between the tension plates and not behind it or knotted up in the way it is threaded
pull on the needle thread and it should move with a steady pull not very hard
if it is not moving fairly easily the check how you have the thread installed
also old thread will break easily as the bonding used to keep the strands together breaks down and is difficult for the thread to slide though the needle
another point is the needle to hook timing and the clearance there as well .
if there is a problem there , the hook will split the thread from the needle and break it
if you still have problems , take it to a sewing machine service center ( any one ) and they will advise of the problem and show you how to fix it
The top thread breaks
1. the needle thread is not threaded properly
2. The needle thread tension is to tight
3. The needle is bent or blunt
4. The needle is incorrectly inserted
5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew
6. the threads were not drawn to the rear after sewing
7. The thread is either to heavy or to fine for the needle
8. Try a different spool or cone of thread
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