Top thread keeps getting wrapped around bobbin case on LX-3125

Make sure needle is not bent and fully inserted. Top thread is not binding (over tension) or snagging on the spool.

This has a transparent bobbin cover? If yes manually advance machine with the hand wheel, keep an eye on the bobbin case, do you see the bobbin case (hook) rotate?

As the needle starts upward, there should be a loop of top thread form. The bobbin case hook captures this loop and wraps it around the bobbin case.

try changing the needle, make sure the machine is threaded correctly,using every thread guide. make sure the top thread hasn't come off the thread take up lever, try a different bobbin, could also be a timing problem

It sounds like the lower shuttle is out of place. You should be able to take out the bobbin case and unlatch the shuttle. It will probably be in 2 pieces. Clean out the dust behind it and replace the shuttle pieces. You may have to fiddle with it a little to get them back in place. Then you can test it by manually turning the wheel. Make sure the bobbin is placed into the bobbin case and that the bobbin turns in the direction that you pull the thread.

Good luck.

Hello Crystal, I also have had problems in the past with drop-in bobbins . I had to experiment with different model bobbins . The cause I found was due to the bobbin was not tall enough in the drop-in bobbin case. When sewing , the bobbin would rock in the bobbin case and the top thread would get caught on the bobbin instead of going over the top of the bobbin, causing the rats nest that you described. I would recommend finding a taller bobbin to fit in the bobbin case. There are about five different bobbins that will fit in there, but only one that will work properly. Knowing the exact model number of your machine would be a great help to finding the correct bobbin.

rethread the machine top & bobbin
change the needle
make sure the bobbin is not warped
clean under the needle plate & in the bobbin area for loose thread or lint

Use a fresh needle and make sure that you place the flat side to the rear when you insert it. Use a coin to turn the needle screw. Also, get a free downloaded manual from www.singerco.com

I would try to re-thread the machine first, make sure you have the tension thread seated on top and make sure that you have the bobin in properly

try these suggestions
1.check needle to see if it bent-roll needle on flat surface & see if it roll true
2.check to see if thread is coming off thread take-up lever
3.check the thread tenison
4.check for lint in the bobbin case area
5.check for loose thread in the bobbin case area
6.check to see if the bobbin is bent or warped

Mine did the same thing. The needle is probably to high. Do not insert the needle all the way to the top. Lower it a bit and it should zig zag!

indicates the needle hook timing is off and the hook is penetrating the thread instead of picking it up cleanly
make sure that the needle is in correctly with the thread groove facing the right way