You do need to provide more details. start here - get a fresh spool of high quality all purpose thread such as Coats and Clarks or Metrosene thread, fill a fresh bobbin, install a new size 11 needle. Follow the threading instructions even if you've threaded the machine a million times, read the instructions again. try sewing on some basic cotton fabric. You'll be able to determine if it's the machine. Breaking thread can be the thread (it does get too old and fragile), the needle, the incorrect needle for the fabric, the wrong thread for the fabric, and a host of other things. So try that and tell us more if that doesn't work.
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Check the tension disk and thread guides of that green thread. Make sure there is no build-up of lint or broken threads hanging up anywhere. Also, make sure the thread coming from the spool and all along the thread path is not wrapped around something causing the thread to hang up. Usually, if the machine will stitch for a couple of inches and then you see the green thread tightening up, then breaking, it is hanging somewhere.
When threading, RAISE the presser foot so the thread will seat properly in the tension disk. Give each thread an extra little tug when threading the tension disk.
Last, set the tension disk to the midway point between high & low number. Then re-test.
If it is still a problem, you may need to take it for service.
Many things can cause the thread to break on a serger. Timing, position of the thread guides, poor thread, and improper tension. One common error is the failure to thread it in the proper order. If the needle are threaded before the lower looper they will cut your looper thread.
The needle 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
Top thread snapping. Do you have an idea of there it is breaking?
First I would check the needle throat plate and needle. If you have stab marks on your needle plate, examine it closely for a crack. (get out the magnifying glass or jewelers loop) I recently fixed a problem I had with an old singer that kept breaking the top thread by replacing the needle plate. The old needle plate was so damaged it had actually made a knife edge which consistently cut the thread right at that location.
Change your needle and make sure it is the proper size for your thread. Too narrow of an eye can shred the thread causing it to break.
Next, check anything along your threading process that could be catching or snagging the thread. A worn or chipped thread guide can be a real problem.
Also make sure your thread hasn't dropped down below your thread cones and wrapped around the thread spindle. This would cause extra tension that might not be readily apparent.
Make sure thread tails are at least 6" long when you put underneath your presser foot. Also, make sure you turn hand wheel toward you until metal take- up lever raises to highest position. Make sure needle inserted ALL THE WAY UP in needle bar goove and secure needle clamp. I M P O R T A N T: presser foot must be raised all the way UP before threading machine and pull thread TAUT when threading machine so thread can locate into the tension slots correctly.
Thread still breaks? Please clean bobbin case and feed dogs for fuzz balls, lint, and anyoose broken threads!
Hope this helps! If so, please give me rating for my free service.
Not sure if you noticed but if you thread a machine with the pressure foot down it will not thread correctly. There are two little things that sorta looks like symbols for the tension on most machines. (learned this when my viking 600e kept breaking thread and I put it in shop) If you thread the machine with the pressure foot down it closes the symbol things and the thread will break as you described. If you have completed that correctly check the spool of thread. You may have a burr on the thread spool that is catching the thread that too has happened to me.
Did you look for a burr near the point of the needle?
If the surface of our needles is a thin layer of chrome it could break lose from the main body of the needle when we hit a zipper too fast leaving a rough spot but I think that constantly pulling a tight thread through the eye of the needle would after a while cut that thin layer ...
here are something you might check
upper thread breaks
1.top tension to tight
2.thread to thick or to fine for needle
3.needle not inserted correctly
4.thread caught on something-spool pin, tension area
6.needle thread is not threaded properly
wrong size needle for fabric
wrong foot is attached
needle clamp screw is loose
also check for lint & pieces of broke needle under the needle plate
also the bobbin case area -take the bobbin & case out & check for pieces of broke needle
here is a tip about needle & thread
Cut 6-8 inch piece of thread of the spool you are going to use for your project
Take the needle you are going to use for the project
& insert the thread thru the eye of the needle
& lift one end of the thread to a 45 degree angle
& if the needle is the right size for the thread it will slide down the thread
But if the needle hangs on the thread you need one size larger needle for the thread
I have found with any serger I have used that you have to cut the looper (bottom) threads before re threading the needle threads. You then rethread the loopers. If you don't do this, the needle threads keep breaking. Hope this helps.