Question about Brother LS-2125 Mechanical Sewing Machine

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Lower thread tension is too loose but no adjustment seems to work

I have used all the suggentions in the manual. I have used all tensions ... up AND down the scale and still have looping at the back of the fabric. The fabric is of normal thickness and the thread is regular thread.

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  • dolci Feb 14, 2009

    I am using a Brother CE4000 and the lower tension is too loose as well. I have tried tightening the tiny screw as suggested but I am confused; there are two screws and one (directly at the bottom of the bobbin case) was painted over green, presumably by the manufacturer. Does that mean I shouldn't tamper with it? I tried tightening the other one (on the right) and it didn't fix the problem.

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From your description it appears that you have tried tension settings on the upper tension control adjustment knob without success.
Check that the bobin tension is adjusted correctly by taking out the bobin complete with the spool.
Pull the cotton thread and it should be a smooth light pressure if the tension is correct. If it is tight to pull or pulls freely then adjust the tension screw which is found on the outside of the bobbin. The screw is very small and requires a minature size screwdriver. The adjustment will only be a slight turn of the screw one way or the other to obtain the correct tension(depending if it was loose or tight).
Once this is set reinstall the bobin and tread up the machine, hopefully with the upper tension set at approx."2" the machine will sew correctly.

Posted on Nov 29, 2008

  • Michele McGinley Aug 16, 2013

    I'm having the same problem with my Brother XL-5340. The lower tension is too loose and leaving loops on the back side of the fabric. I've tried adjusting the upper tension control knob (all the way to "0") as the manual suggested with no success. Is there an adjustment screw on this machine, and where would I find it?

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2 Answers

Lower thread tension too loose


sorry without knowing your MAKE machine I can suggest nothing helpful

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How to adjust the tension of the serger machine


It helps a lot to use 4 different colors so it is easier to tell which thread tension needs adjustment.

Sergers have tension dials for every thread. Start out with the dials set at the midway point between high & low numbers (this is the factory standard, however, the settings can change with machine use and wear). Be sure to RAISE the presser foot while thread every thread--this allows the tension disks to open. It also helps to grab the thread with one hand below the thread tree and, with the other hand, grab the thread below the tension disk and give it a little tug to insure the thread is seated all the way in the tension disk. Check to make sure every thread is threaded in the proper order (consult the owner's manual) and that every thread follows the correct path.

Test. Tweak the thread tensions. Higher number usually tightens a loose tension, lower number loosens. The correct tension is when the looper threads meet at the very edge of the fabric without causing fabric pucker; needle threads should be smooth with no loops or pulliing.

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Mar 10, 2016 | Sewing Machines

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When i sew a test piece of fabric on my sewing machine to check the stitching, the top thread seems fine but the bottom thread is loose and adjusting the tension doesn't seem to help


there are two thread tensioners on a machine
the first one is on the front of the machine for the top thread
the second is the small screw that holds the small flat spring under which you pull the thread after you put the bobbin in the holder
as you put the bobbin in the holder you have to pull the thread around the side until it slips into a small slot then under a retainer spring
that spring is adjustable by that small screw
the amount of tension added or released by that screw is minute so as little as 1/8 turn has a big bearing on the amount of tension of the bobbin thread so turn it just a small bit at a time until the thread tension is correct

Oct 14, 2015 | Sewing Machines

1 Answer

My bobbin thread keeps looping and the top looks fine but pulls out easily. I tried adjusting the top tension, but it didn't help. What can I do?


There could be several things that could cause the machine not to pick up the bobbin thread.


1. The upper thread could be tangled. Remove the thread completely from the machine. The correct size spool cap should be used for the size of the thread spool. Re-thread the machine according to the directions in the manual.


2. Remove the bobbin and make sure the bobbin is threaded properly in the shuttle race. Remove any loose threads or lint in the shuttle race.


3. You could be holding the needle thread too tight. Hold the thread lightly to keep the end from going down into the shuttle.


4. The needle could be thread incorrectly. Thread the needle eye from the front to the back.


5. The needle could be bent or improperly inserted. Install a new needle with the flat side of the needle facing the back.


If the problem persists, your machine may require service.



The bobbin thread tension has already been adjusted at the factory for general use. For most applications, no adjustment is needed.

When sewing with then thread on thin fabrics, the thread tension may not be adjusted adequately with the upper tension control dial. Therefore, the thread tension must be adjusted according to the procedure described below.

If bobbin tension is too loose and locks appear on the surface of the fabric, decrease the thread tension by turning the dial to a lower number.

If the result is still not satisfactory, then adjust the bobbin thread tension.

Increase the tension in the bobbin by turning the screw with a small screwdriver in a clockwise direction. However, do not turn the screw more than one full turn.

Jun 19, 2011 | Brother XL-5340 Mechanical Sewing Machine

1 Answer

My Necchi 4595 has never really worked properly,.,.,the lower thread (bobbin) is very loose and then the thread breaks,,,I've tried to adjust the tension, but maybe I'm doing that wrong.


I also own 2 necchi sewing machines, my mechanical is a 4595,,
lower thread tension
to test the bobbin tension, remove the bobbin case & bobbin & hold it by suspending it byb the thread, **** it once or twice, if the tension is correct, the thread will unwind by about an inch or two.
if the tension is too tight, it does not unwind at all, if the tension is too loose, it will drop too much.
to adjust the tension,, left is loosen & to the right tighten

thread breaks
rethread the machine making sure to get all thread guides
top thread tension usually 3 or 4
replace needle- make sure the needle is inserted correctly
some needles don't work with some thread, here's a tip

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

Nov 16, 2010 | Necchi 4595 Mechanical Sewing Machine

1 Answer

Lower thread tension very loose


is the bobbin threaded correctly? the screw on the bobbin case is the point to adjust its tension.

May 27, 2010 | Brother Sewing Machines

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Kenmore Sewing Machine Drop-in Bobbin Tension Adjusting Problems


looped stitches are usually caused by improper tension. when the loop is on the upper side, it may be corrected by loosening the top tension or by tightening the lower tension (turn the tension screws on the bobbin a hair at a time)

since using the machine only a few times it is best to clean the machine from dust (can use a can of air) blow air into the bobbin area and between the tension disks and under the throat plate.

make sure the machine is threaded correctly and bobbin is evenly threaded

Aug 26, 2009 | Kenmore Sewing Machines

2 Answers

I have a Brothers XL-3200 which works great but then the bottom thread will bunch up, amass, thread will wind around the bobbin and lock up the machine. It can also break the needle. Can you help me??


Your thread tension needs adjustment.

Most likely it is the lower thread tension (not the upper thread tensioner).

When sewing very thin or very heavy material - it is required to adjust the lower tension as well.

To regulate the lower thread tension - turn the small screw on the tension spring of the bobbin case with a small screwdriver.

To increase tension - turn it clockwise SLIGHTLY.


Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jul 01, 2009 | Brother XL-3500

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Sears Kenmore sewing machine model number 15358 tension issues


#14 needle is way big for cotton napkin scrap. a #10 is good for most lightweight fabric. #14 is for sewing denim or levis, like that.

the tension problems on almost all machines regardless of price usually fall on the upper tension. the lower bobbin tension is factory set and it's rare you should ever need to mess with it.

if you have a drop in bobbin (top loading), tighten the adjustment screw all the way and then back it off 1/4 turn. if your machine uses a shuttle bobbin, tighten the adjustment screw all the way and then back it off in 1/4-turn increments until you can hold it in the air like a yo-yo and cause to bobbin case to fall slightly dipping your hand.

A dull needle and stitch length will also mess up your stitch. The idea is to narrow the problem down to one thing and one thing only -- UPPER THREAD TENSION.

So, if you have the right size needle for the job, with the right thread, and if your stitch length selection is correct (usually between 2 and 3 or 8-to-10 stitches per inch, the problem should be with your upper thread tension.

An easy way to fix this then is to remember: Loops on top, upper tension drop. Loops below, upper tension grow. If you get loops on top of your work, lower (drop) your upper thread tension to a lower number. If you get loops on the bottom, raise the upper thread tension.

Different stitches on the same machine will require different upper thread tension settings. Don't be afraid of it. Just remember the pneumonic: loops on top, tension drop, loops below, tension grow -- referring to upper thread tension.

have fun :)

Apr 15, 2009 | Sewing Machines

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