Loops on bottom - Brother LX3125 Sewing Machine

Most likely there are jamming threads at bobbin room under the machine stepping pedal, try to dismantle it to get rid of these threads.

Thread looping can also be caused by the use of adhesive stabilizers. During embroidery, your needle can gum up. Try floating a sheet of wax paper on the bottom to see if that might be the cause (along with the above solutions, of course).

Usually on a serger if loops too big you need to tighten top or bottom looper tension or both. The tighter the tension the smaller the loop. Also if you're not running the material straight with the knife it can make loops in places that although the same size as other loops it's covering less edge so the loops appear too large in places.

Your description isn't very clear. When you say the "bottom stitch is using too much thread" Do you mean you see lots of loopy threads on top of the seam? Or do you mean you see loops on the bottom under the fabric? If your loops on the bottom, that means the top tension is too loose, you've not remembered to put the presser foot down, you have not threaded the top thread properly... Start by rethreading carefully with the presser foot UP. Then do a test stitch, remembering to put the presser foot down. If you still get loops underneath... tighten the tension.

If your loops are on the top of the fabric. loosen the top tension... then do a test seam... and if you still have loops loosen again and repeat. If you start to see loops on the bottom... tighten the tension a bit.

Good luck

Please describe further what you are seeing on the seam? Loops on bottom? Loops on top?

loops at the bottom means that the upper tension or threading is wrong

General rule of thumb::
loops on the bottom, problem on the top.
loops on the top, problem on the bottom.

It sounds like your bobbin thread is not thru the little tensioner in the bobbin compartment.

If the thread is looping on the bottom, then your problem is on the top. Pull the thread out of the needle and and put the presser foot down. If the thread pulls thru easily, then you need to rethread your machine making sure the thread is thru the top tension wheel correctly.

Rule of thumb::
Loops on the bottom, Problem on the top
Loops on the top, problem on the bottom.

FYI---- Loops on the bottom-- problem is in the threading..
Loops on the top--- problem is with the bobbin.

Looping on bottom:
Great description, that helps a lot. Big loops are actually easier to solve usually. 1st know this: Loops on bottom means the top is too loose or the bottom is too tight. With loops that big its probably the top is too loose. 1st look in tension disks, there is likely a chunk of thread in there. A toothpick is handy to dig it out (the flat kind) 2nd make sure that the thread is getting between the disks when threaded. 3rd Make sure the thread is in the take up lever (the thing that moves up and down in front and not the needle bar or any part of the needle bar.) If neither, then the bobbin case could have a burr on it and the thread is hanging on that burr. Also the bobbin case may be in wrong. I hope this helps
Kent581