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There could be several things causing this. First, be sure the bobbin is in the bobbin case correctly. There is usually a line diagram showing the correct placement or you can check the owner's manual. Second, make sure your needle is inserted correctly. If it is not completely set in the housing, this can prevent the bobbin thread from being caught by the hook. The groove in the needle should be ffacing toward you to assure that the thread interacts with the hook. Third, be certain the upper threading is correct...passing through all thread guides and correctly through tension and take up lever. Finally, make sure the bobbin case is free of lint. The machine brush that came with the machine will clean this area well. I hope one of these suggestions helps you solve your problem. If so, please come back to Fixya and rate my advice!
The upper thread flows from the left to right as it goes through metalstems (posts) with holes, along the top of the machine head, and thendrops down and passes over and under the upper gension disk and thetake up spring. Then, moves back up to the take up arm (which moves upand down like a goose's neck when turning the handwheel) then startsthe trip down to the needle, going through a couple metal loops (calledthread guides) and lastly through the needle thread guide and throughthe needle eye, as I recall from left to right (?), this part is moreobvious when looking at it.
Heres a link to a manual for that machine. hope this helps
indicates needle /hook timing is off check/ adjust or take it to a repair shop for adjustment
singer have a very good manual on how to set timing so download a pdf version from the singer site
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