I have the bobbin inserted correctly. I've tried numerous times. I've checked the screws - all are tight.
Is your needle in backwards, always the flat shank to the back, make sure it is in all the way up in its housing too. Is it a new needle, not blunt, bent or hooked on the tip, sometimes we don't notice butthe needle is very important and should be changed every 4-6 hours sewing time. The shuttle hook goes around and catches the upper thread during stitch-formation, timing of these two parts is crucial so if this is a machine that has been damaged or do you suspect the timing is out perhaps. If so, technician time.
SOURCE: Elna SU missing stiches and breaking thread
it sounds like the needle hook timing is out. You need to get the needle in the lowest position and measure the gap from the needle to the hook point on the bobbin shuttle. It should be 1/4". You will need to remove the foot and foot plate to be able to see. I use a 1/4" drill bit as a gauge. If you need to adjust it, you will need to remove the free arm cover to the right of the foot and loosen the 2 allen head screws that hold the drive gear. Adjust the gap, tighten the screws and retry. Usually if the needle catches the thread to early, it will make a bad stitch and the upper thread will break. If it catches to late, it will make thread loops and the machine will skip stitches. Good luck, these are a good machine and worth fixing. Phil
SOURCE: will not pick up bobbin thread
Unusual for this machine. Check to be sure the needle is inserted with the flat side to the back of the machine. If it is, remove the needle plate, bobbin and bobbin case. Turn the hand wheel slowly toward you and see if the point of the hook is above or below the eye of the needle when the hook point is aligned behind the needle. If the eye is above the point of the hook the machine is out of time and best taken to qualified technician.
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