Thread brakeing - Juki DDL-8700

Usually thread breakage is a result of incorrect threading or the thread tension set too tight.

Install a brand new needle.

Remove the upper thread. RAISE the presser foot and rethread from the beginning (verify the threading sequence is correct).

Check that the tension is set at the midway point between the high and low numbers.

Retest. If still breaking, there are other less common problems (thread/needle incompatibility, burrs or knicks catching the thread, etc) that may be the cause. Check the following web sites:

Sewing Machine Thread Keeps Breaking

Why is my thread breaking

Sewing Machine Problem 1 Thread Breakage

How old is your thread? Old thread will break fairly easy, also you want just enough drag to keep the thread from over feeding but not so tight it will brake thread

The top 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
8. Try a different spool or cone of 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


Skipped stitches

1. The needle is not inserted correctly

Remove needle & reinsert needle( flat side towards the back of machine)

2. The needle is damaged

replace with new needle

3. The wrong size needle is being used

Choose a needle to suit the thread & fabric

4. The foot not attached correctly

Check & attach correctly

here are some suggestions
Is machine threaded correctly, check each thread guide, all tension dics
Are needles inserted correctly
Are the needles bent or damaged
Is tension adjusted to tightly
Is tension adjusted to accommodate thickness of thread being used
Are you using good quality thread
Is thread feeding off cone/spool freely
Is the needle size correct for the type of fabric being used
Are the needles being used the correct ones for the machine

The top thread is fine but the thread on the botton is a mess sometimes is has to be cut out

if you are using HUS bobbins make sure you have it in the holder with the H facing up and then wind through the 2 small pieces of metal.. Hope this helps!

Chance the needle making sure it is aligned when you tighten it. Check the bobbin to see if it is bound up by thread and the last thing is try another bobbin.

It might be tension to tight, threaded wrong or the bobin isn't thread the right way.

Check the condition of the top pressure discs and the bobbin case tension. Check for wear in the hook - is the bobbin case seated correctly? Check the tension spring in the bobbin case. I doubt timing has anything to do with the problem. Unless the hook's picking up the top thread a little late, thereby "spearing" the thread. The hook could be catching the thread loop too late. Sounds to me like there's a parts or a small adjustment problem. You don't mention thread or needle size. That's another area of concern at times.