At start of each sewing session whether on fabric edge or in a continuous stretch, the right hand needle picks up the lower looper thread (red guide) and tacks it into the seam. It then carries it and pulls it with the seam. The seam continues to loop because the thread is still in line. If you snip the thread that has snagged the looper thread, it quits looping. I've rethreaded, changed both needles, changed the thread, and it continues to snag it until it finally snaps the looper thread
SOURCE: needle picks up bobbin thread but then thread gets stuck
I've had similar problems (as well as other problem with the thread breaking all the time and the "shuttle race" thing that holds the bobbin falling out. One very important thing that isn't mentioned in the manual but that the salesman stressed is that you have to use only "Schmetz" brand needles. They are a tiny bit longer, but that makes all the difference in the world if your stitches are skipping. I forgot and used Singer needles and had horrible results.
SOURCE: thread snagging on shuttle
My first guess is a tension problem, my second guess is you could be using cheap thread. Sewing machines don't like cheap thread. But check out your tension first.
SOURCE: Unable to get bobbin to pick up thread from needle.
Check the thread coming out from the bobbins maybe on reverse side,also check the bobbins tension adjust it there is a small adjusting screw.Check also the needle alignment lastly check the upper tension from the tension regulator knob,tension adjustment is depend on the fabrics that you sew.
SOURCE: My white 2000 serger is dropping the thread on the
Could be as simple as poor quality thread (not using MaxiLock thread), the needles not inserted properly (the left is slightly higher than the right), a missing stitch forming pin on the needle plate, the needle bar being too high or a looper timing issue.
As the needles raise, the upper looper should move to the right with the right needle tip slightly above the eye of the looper.
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