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Could not adjust both looper thread tention on singer ultralock

The left and right looper threads are too loose: the nob tention all the way to 8-9, the thread pulled between the disks, machine is threaded correctly, but the edge of the overlocking stiches extend about 2mm beyong the cut edge of fabric: sloppy mess!!! Cleaned the machine, checked stationary knife adjustment, tryed every possible tention combination. What could I do? Could not obtain 3mm width with the right needle only. Was doing OK few month ago, but I noticed that I had to increase the tension slightly overtime. Does the springs go bad in the tension disks?
Thank you.
Singer ultralock 14u34b

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  • Anonymous Mar 25, 2014

    How to set tension.

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When servicing these machines I have found that the cover over the tensioners needs to be removed so you can see if there is more adjusting possible. If its a newer serger you would hold the knob somewhere in the middle (4-5) and adjust the knurled part that goes through it. Many times I have had to rebuild these tensioners as they get dirty and need cleaning and adjusting. It may take many tries until you have it adjusting correctly. But it needs to be done.

Posted on Feb 13, 2009

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I have a singer ultralock 14u34. The lower looper will not stay threaded when I try to sew, just works for an inch then nothing is catghing and the looper is no longer threaded.


Some sergers will unthread themselves if the thread is not threaded through the throat plate right. Especially the lower looper because there is not a lot of space for it to move. Try bringing the thread from the looper straight up through the hole in the throat plate, not to the side of the plate. You can also talk to the professionals at the link that I have attached. They are very helpful and easy to work with. Good luck Sewing Machine Repair Repair Sewing Machines Sewing Machines Repair Fix...

Jan 25, 2015 | Singer Sewing Machines

1 Answer

Singer 14u34b


Assuming that your rethreading specially the upper looper and the lower looper threads tension is accurate, and still problem in getting the left/right needle to stitch then most likely looper/thread timing is out. This will need your local technician to do the adjustment.

Oct 31, 2013 | Sewing Machines

1 Answer

Stitching is too loose on the Juno Janome Serger Model 3434D


sergers the most frustrating machines. Every time you change fabrics you go through a tension adjusting phase.

First make sure you have threaded the machine in the proper order. upper looper, lower looper, then needles from right to left. Always thread any machine while the presser foot lever is in the UP position.

If you ever break a thread... you MUST pull all threads and rethread using the proper order.

Ok that's out of the way. Pull all your threads and get out several pieces of the same fabric scrap. Thread each pathway with a different color. This will help you determine which thread is giving you fits. Sew a test strip. Which thread is loose? tighten/loosen that tension. Keep doing this until you have a well balance seam. Then clip the colored threads starting with the upper looper thread, tie off to your proper color for your seam pull the thread through and up through the throat plate. proceed in this manner with lower looper, right needle, left needle. Sew a test seam.

Good luck.

Aug 08, 2012 | Janome Sewing Machines

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

2 Answers

I am doing some sashes for a wedding and i want to know on my serger 14SH654 ultralock how to do a rolled hem


A rolled hem on any overlocker is formed by using the right hand needle only, and the two loopers to form a narrow three thread seam. You also need to retract the seam width finger as Trial2962 said. This is a little finger that sits on the stitching plate and the loopers form the stitching over it. By retracting it, the looper threads can form a narrow seam and in fact, roll the fabric inside the seam. You need to move the cutting blade as far right as it will go so you are trimming as wide as possible from the needle, turn the tension on the top looper rigth down to 2 so it is very loose and this thread wraps around to the underside. And tighten the lower looper tension to about 7 so it hardly shows and sits right up against the needle thread. Adjust and test until you get the seam looking like this, then turn the stitch length dial (on the right side by flywheel) down to 0.5 to close the seam right up tight. Lastly, if you can source it in the right colour, buy woolly overlock thread and run this through the upper looper only, this thread is fluffy and when not under tension, relaxes and "fills" out so the seam appears like a continuous coverage over the fabric.
9_26_2011_11_26_51_pm.jpg
You will need to practice a few runs and go slowly on corners, a curve is obviously much easier to serge than a right hand cover so if you can, cut the fabric with curved ends, much easier to get a great finish. When you chain off at the end, you need to unravel the tail threads and pull them inside the seam for a few mm with a needle to get a smooth finish, then trim the tail and seal with a drop of Fray Stop.9_26_2011_11_26_51_pm.jpg

Sep 04, 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

How do i adjust the loose thread on top? Using the 3 thread stitch the top loop is loose and bulging over edge instead of smooth with rest of stitches. Setting is set to recommended setting but is still...


I always adjust my overlocker stitch in several ways. I start test serging with the blade set right out to the right so that it "fills" the stitching. I'll set all the thread dials to the middle setting, ie. 5. Then I test serge, and check the stitch formation. If the needle is looping underneath, then I'll tighten it "A LITTLE". If the looper threads are lying off the cut edge of the fabric, then I'll dial both the top and bottom looper numbers up a little to make those threads tighter.

Each fabric behaves differently depending on its "hand" so the right stitch settings do vary, ie. organza is different to heavy weight cotton or denim. So if my inital setting is then "bunching" up the fabric within the stitching, I will then lower the numbers for the top and bottom looper to release the thread some. And if the fabric is very soft and light and still bunches up, then I will move the blade over to the left some, cutting a narrower edge within the overlocking so the threads lie better.

So revist the settings, check that the cones are flowing freely, thread is into the tension devices fully, then retest the stitching. If it is the top looper only that is looping off the edge, and not the bottom as well, and they are both set to the same number, then I'd be a bit suss about the tension dial.

Feb 28, 2011 | Singer 14SH654

2 Answers

I had to rethread my Singer Ultralock serger and now it won't sew correctly. Best I can tell the lower looper keeps coming unthreaded, but this doesn't happen until I put material in. I have rethreaded it...


I had read where someone said their lower looper tension dial had pulled apart. Sure enough, mine had too. We snapped it back together and Voila problem solved!

Dec 06, 2009 | 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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