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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Posted on Jan 02, 2017

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When sewing a straight stich The bottom thread is loose.


Your upper and lower thread tensions are out of balance. The upper thread tension is too high or your lower thread tension is too low. Make sure your bobbin thread is correctly routed under the tension spring. There is a small screw on the bobbin case that always you to adjust tension.

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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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How to adjust the bobbin tension.


According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"

Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."

There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.

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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

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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.

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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

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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.

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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 :)

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