The machine is sewing a few inches when the needle thread somehow disengages, a few skipped stitches occur then the stitches continue for another few inches before all threads disengage completely. I have rethreaded repeatedly, cleaned lint from every tiny place I could find. I made another test stitch sample that was a little longer than the previous ones before the problem started all over again.
Make sure you are threading the machine correctly. Make sure you are using serger thread that isn't old. Make sure you are undoing all the threads when it breaks and thread it from the beginning.
Make sure you have the right needles in their respective places. My Juki MO has two different size needles.
SOURCE: JUKI MO 134 SERGER
How to Thread Juki MO-134 Serger from watching lady at Lyles. Turn upper blade up. Push in first then turn up.It makes threading easier. Blue Thread upper looper first. Pull thread through tension knob. Don'tjust lay it there. (She thought that is what I must have done) Orange Thread lower looper next. Pull thread through tension knob as inthreading upper looper. Adjust lower looper so it is right nextto upper looper so that their points are almost together and directly belowsewing needles. Lower looper will be in front of upper looper (I believe). With tread from upper looper pulledback, slightly lift lower looper above upper looper and thread. I think this isright. Pull thread back with other thread. Tension is the key. Remember that. Yellow: Thread left needle first.Remember tension. Pull thread through curled wire on left side of needle arm. Green: Thread right needle. Rememberabout tension. Pull thread through curled wire on right side of needle arm. b> Note: Before sewing turn the wheel tomake sure the stitches are going together correctly.
SOURCE: skip stitch
The three most obvious causes (other than that of the machine possibly being slightly out of time) are:
1) Too small of a needle size - increase the size.
2) A needle that has a flaw / defect - change the needle.
3) Needle not inserted correctly, either not pushed all the way up into the needle bar, or not installed facing the correct place. On this machine, the small "scarf" in the needle (an indent just above the eye) shouldface the right side of the machine.
SOURCE: I recently purchased a Juki
perhaps you have the wrong needle or its not in the proper position?
SOURCE: Juki DDL-8700--top & bobbin thread won't hold together for stitch
What bobbins do I use on a Juki DDL-8300
SOURCE: Juki dnu-1514s The machine is threaded
Your bobbin system isn't engaged. this can happen for several reasons, mostly when things are a little out of whack.
The 1541 has a 'clutch' it located near center on the bottom surface and is a silver circle below the 'arm'. Bring the needle all the way down, now push the clutch and hold while you turn the wheel back (top away from you) eventually the clutch will click when everythings aligned and engage the bobbin system again.
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