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Singer overlocker 14sh754 thread keeps knotting underneath, it doesnt appear to be coming of the lower looper

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: Lower right thread (green) keeps coming out of its eye!

I am having the same problem with the right (green) thread breaking. I went to the Hancock store where It was purchased and they had the same problem (with their display model) when they tried to show me how to thread it..Help!

Posted on Apr 24, 2008

  • 2 Answers

SOURCE: lower looper threader

check to make sure it is not wraping around the upper looper. just stitch without the material and you will see it. but then you must rethread the upper looper and the lower looper again in the right order. hope this helps

Posted on Jun 25, 2008

  • 1 Answer

SOURCE: thread continually breaking in lower looper needle

I was having this very same problem with my lower looper . I had been using the one needle stitching all afternoon and I was doing quite nice stitching. then I decided to put the right needle back in and do some overlock stitching and guess what I spent the next two hours fighting the looper problem. I had completely re-thread this machine at least 20 times now. I decided to take the needle out and re-insert it and re-thread it one more time (right lower looper- then upper looper- right needle- then left needle) was careful to pull all threads to the back and under the presser foot for about 6 inches.
Held on to the thread, lowered presser foot and did the chaining stitch. BINGO it didn't break, tried it with a piece of cloth and Perfect stitches. I have a Babylock BL402 and used tension settings left to right
4-3-3-3 and default settings for the rest.
Hope this helps someone someday.
Jo Griffith

Posted on Mar 29, 2009

  • 1 Answer

SOURCE: I had to rethread my Singer Ultralock serger and

what should the tension dials be set on? A general idea. And, do you know what function each dial is? I do not have a manual for my machine.

Posted on Jan 07, 2010

  • 16 Answers

SOURCE: looper problem on 14SH644 Singer Ultralock Serger w/differential

try www.sergerparts.com there you can find a nice tutorial on how to set the timing.

Posted on Aug 19, 2010

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Toyota overlocker sl3000 ; 3rd thread keeps snapping. How do I stop this ?


Third thread--is that the upper looper? Remove all the threads from the machine. Clip them below the thread tree, RAISE the presser foot, and then pull all 4 threads down through the needle. (Never Pull Up!!)

ALWAYS RAISE the presser foot.
Rethread beginning with the Upper Looper, then Lower Looper, then the needles. Be sure to ALWAYS thread in this order!! (On most newer machines, when threading the Lower Looper, always finish with the Lower Looper "draped" over the top of the Upper Looper.)

If a thread breaks, remove the threads and start over from the beginning as trying to fish a thread through the existing threads very SELDOM works.

Verify each thread path is correct.

When threading each thread and to insure the threads are seated in the tensioners, give each thread an extra little tug when going through the tension disk.

Be sure to oil your machine frequently to keep it operating smoothly!

Make It Handmade Threading Your Serger or Overlocker

Serger threads Threads Magazine Gatherings Forum Sewing Questions Answers

May 03, 2017 | Toyota Sewing Machines

1 Answer

Singer 14T967dc serger runs but does not stitch


Hello Laura

Make sure that the lower looper thread is in front of and over the upper looper thread when threading the serger; when threading for overlocking.

Please let me know how this worked out for you
Happy serging

Feb 24, 2017 | Singer Sewing Machines

1 Answer

Bernina 335 serger won't sew/overlock. carefully rethreaded the serger but that hasn't helped.


The 335 has a two thread chain stitch (stitch type 401), and the overlock side (right needle side), is a three thread plain overlock. If you are describing the plain overlock as the problem, I would first suggest the following in re-threading:

1. Thread the upper looper
2. Thread the lower looper
3. Thread the needle last (important)

If the needle threaded, you cannot re-thread the lower looper without breaking the thread.
In order to thread the lower looper, the lower looper must pass by the needle thus picking up the needle thread. So, instead of threading the lower looper thread underneath the needle thread, the looper would be threaded on top and cannot sew without breaking the thread.
Make sure that the threads are bedded between the tension disks. Check this by stretching the thread fore and aft of the tension disks as well as visually noting that the threads are not accidentally threaded behind the disks. You can also loosen the tension disks when threading so as to allow the threads to bed deeply between the disks.
Please reply with your observations.

Sep 27, 2015 | Bernina Sewing Machines

1 Answer

My serger doesnt make any stitches at all. I have been going through this book for 3 years and I cant get it to work


Has it ever chained off since you bought it? If you purchased it second hand it is possible that the timing of the loopers is out and this will prevent a chain from forming.

However, I'll go through general overlocker/serger troubleshooting for threading up. The critical things are to thread it exactly as the diagram shows, some sergers have a diagram inside the front looper cover so its easy to refer to when you are working on the machine. Or use the manual diagram. There is a sequence you need to follow in threading up, usually upper looper, lower looper, then the needles. This is important. Then you pull all four threads under the raised pressure foot, lower the pressure foot, and start to stitch and hopefully a chain forms. If you need to change a thread you can knot on a new colour, turn the tension to zero, then pull through the new thread. Pull the knot right through the looper eyes but you will need to cut the knot out and thread the needles with the new colour once you get there. Then turn tension back to the normal setting (5 usually) and again pull all threads under the foot.

The timing of the two loopers to the needles is critical to a stitch forming though so if you have tried everything and aren't getting a result; then perhaps its time to take it to a service centre, get it checked out and if it works fine for them, ask for a quick demo of threading up, then do it yourself with the demonstrator watching.

Overlockers are very different to sewing machines and there is a learning curve but once mastered, they are so quick and give a great finish.

Oct 08, 2011 | Singer 14SH654

1 Answer

How to thread a singer serger overlock machine


you can visit the Singer website and download a pdf manual from there. Link is http://www.singerco.com/accessories/instruction-manuals, type the manual number into the search field and click "search" then wait for the screen to build. There should be a red box "Download now" beside your model, click on this then again wait a while as the pdf file will be large. Once it opens to your screen you can save it to your PC, then print it out and bind or staple it up.

Threading a serger is completely different to a sewing machine and you will find a set of tweezers and a wire loop are invaluable. If these are not in your machine kit, then you should be able to buy from a sewing centre. You need to thread up in the sequence shown in the manual. For a four thread stitch this is probably upper looper, lower looper, then the two needles. But check the manual as it may be different on yours. Many sergers will have a threading diagram inside the front looper cover and this really helps until you get used to the machine. If you have cone holders in your kit put these onto the spool holders to keep the cones steady. Take the thread from the cone up to the aerial loop, down into the top loop, around the tension dial ensuring the thread has seated in correctly, then follow the threading guide down through the looper eyes and across to the stitching bed. Repeat for each thread path, then pull all four threads under the raised presser foot, lower the foot and chain off. Test stitch on fabric and look at the stitch, then adjust the tension dials for the loopers if needed. Needle tension shouldn't need changing usually.

Also check the manual to see if your model takes standard 130/704H needles, many do. But some sergers need a EL needle, its just a little longer. If you primarily plan to stitch knits on yours, then use ball point needles to stop stitches skipping. Otherwise sharps are fine, normally size 80 or 90. You won't need to change the needles as often as you do on your sewing machine but change if the stitch quality starts to go off.

And remember, always lift the aerial up to full height when you start to use the machine each time. The thread flows very fast through these machines and you need the aerial up high to give clearance for the cones so the thread can run off them smoothly.

Its a really good idea initally to thread up in 4 different thread colours and then you can diagnose the thread formation and see which thread to adjust tensions to get a good overlocked seam. Factory settings are usually 5 on all four tension dials but check your manual to double check this. Many times if you change colour thread, you can just knot on the new colour at the cone, turn the tension dial to zero then pull that thread through. This works fine for the loopers and on the needles, you just need to cut the knot off and thread the needle with the new colour. Then turn tensions back to normal setting, put the thread under the foot and chain off.

And if you do have a Singer dealership near you, perhaps see if they have a serger class as there is a few techniques that are so much easier to learn when shown; such as stitching into a right angle or turning an outside square corner and how to finish of the thread tails at the end of a seam.

There is also some good pages of info on the www.sewing.about.com website, Debbie covers overlockers/sergers there and gives good photos and info as well as free projects.

I trust this helps you get started with your Singer Overlocker.

Oct 05, 2011 | Singer 14SH654

1 Answer

What setting are the three threads set on for a rolled hem on a singer ultralock l4sh654 and what is the lever by the plate for?


Rolled hemming on any overlocker is usually achived the following way. Right hand needle only.
Blade over to the right usually to cut wider than normal but you can vary this to suit the fabric and stitch width you want.
Thread in this needle and the upper and lower loopers. If you can source any, use woolly overlock thread in the upper looper, this fluffs out when not tensioned and covers the fabric to give the look of solid stitching. Change upper looper tension to about 2 and lower looper tension to about 6 or 7.

The lever by the plate is usually to control the little stitch finger where the stitches are formed, move it backwards and it should move back towards you?? If this happens, then you want it in the retracted (towards you) position for rolled hemming so the stitching is much smaller and the fabric can roll. Normally this stitch finger holds the fabric firm for the loopers to form the stitch over for your normal 3 or 4 thread overlock.

Now test stitch and see how it looks. Tighten the lower looper thread so it lays right beside the needle on the underside. You may need to then tighten or loosen more the upper looper, you want the upper thread to wrap all the way around to the underneath against the lower looper thread and needle.

The cut edge of fabric should roll to underneath inside your seam. Once you've got this happening, turn the stitch length down to 0.5 or so to close it right up tight. This uses heaps of thread so I usually test everything else, then close it up at the end to minimise waste.

Hope this makes sense, good luck.

Sep 22, 2011 | Singer 14SH654

1 Answer

I am trying to do a rolled hem using a singer ultralock 14sh654. Do I disengage the knife? The stitches are uneven and some are quite loose no matter how much I adjust the tension. I am positive I...


no, you need the blade in place and cutting to give an even cut fabric edge. Set up for a three thread using the right hand needle, take out the left hand needle. move blade over to the right so it is cutting wide. Most overlockers there is also a thread finger you need to change on the foot, or a little lever you flick to move this finger forward into the stitching area. Check this on your manual as each make is a bit different.
If you can source it, put wooly nylon thread into the upper looper (knot it onto existing thread and just chain it through, the knot should go through the looper eye fine). Now turn the tension on top looper down so it is looser and tighten up tension on bottom looper, so needle 5, top looper 2 and bottom looper about 7.

Now test serge, the fabric cut edge should be wider than the overlocking seam so the fabric rolls under inside the stitching. Adjust the two looper threads so that this is happening, you want the bottom looper thread to nest right up against the needle stitch and the top looper thread to wrap all the way around too.

Once you've got this happening, turn the stitch length down to 0.5, to close the stitching right up. On some fabrics you'll need to adjust the differential feed too if the fabric is "waving" a bit.

Uneven stitches or sometimes loose when serging could indicate that one of the tension devices is faulting, so if this machine is not new and its doing this, it could need a service. Can you get a regular smooth three or 4 thread seam out if it???

It is always good to just recheck the threading path, make sure the thread aerial is up and that a thread hasn't got caught back on the thread stand somewhere if you're getting something wonky happening, threads stream off overlocker cones through the machine so anything wrong in the thread path will throw off the stitching.

Jun 25, 2011 | Singer 14SH654

1 Answer

Singer Overlocker/Sergers require particular threading order. If that does not help you may as I did have to take it to an Authorised repairer. It has to be a Singer Authorised as they have done training...


Sergers thread upper looper first, lower looper second, right needle third and left needle last in that order. If your thread breaks, CUT ALL THREADS and start from scratch or you will not get a good stitch or your machine may jam. It's probably just a "user error."
Good luck.

Jun 17, 2010 | Singer 14SH654

1 Answer

Singer overlocker


Most likely is the left looper thread is trapping the needle threads.

Remove the threads and start over in this sequence....

Left looper - right looper - left needle - right needle.

If you thread the needles before the lower looper, the needle thread wrapped over the looper will be under the looper thread and will never be free to form a stitch, so the threading sequence is critical.

Jun 08, 2008 | Sewing Machines

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