Question about Brother XL-3510 Mechanical Sewing Machine

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My threading is too loose?

My threading is tight on the top but loose at the back (bobbin side). I've tried different tensions, but it doesn't seem to be working. I also re-threaded the bobbin but it still isn't working. This problem just started how do I fix it?

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Re: My threading is too loose?

Thank you - fixed it completely... though you have to take the bobbin case out completely to access that screw. - Remove the 2 screws holding the metal plate with a nickel and remove the plastic piece over the bobbin case - there is a small metal lever on the lower left side that needs to be pressed down. You can then remove the bobbin case. There are 3 screws - the center one is the tension adjustment. It was painted green on my machine.  It appears that it is not a regular setting change, but a bad adjustment from the factory. So if you don't feel comfortable doing all that returning the machine for another will likely fix the issue.

Posted on Mar 26, 2009

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I have a Pfaff 7550 that has tension problems. The bobbin doesn't seem to be coming through and the top thread is all loose and loopy. I have tried everything I know and still it is not fixed....h

How are you threading the machine? Is it with the foot in the up position? If you "floss" your upper tension discs with some sturdy fairly rough fabrick like linen. The disc sometimes get clogged up with lint, thread, wax from the tread... and prevent them from providing proper tension.

good luck.

Oct 01, 2012 | Sewing Machines

1 Answer

I have a Viking/Lisa Model. I am having trouble with my tension and I am not sure if it is the top or bottom. My bobbin thread is all of the sudden too loose.

I just bought a Viking Lisa, and also had to adjust the tension. Use the manual to make sure you've threaded the machine correctly and put the bobbin in correctly. (I wasn't getting the bobbin thread the way it needed to be.) Then gradually increase the tension on the dial inside the top cover, checking the bobbin stitches every two inches, ending up on about 4 1/2. If this doesn't take care of the problem completely, gradually increase the side tension dial, and between adjustments on both dials, you should end up where the stitches look good. Also make sure to use cotton thread; mine doesn't like polyester thread. :o)

Aug 20, 2011 | Husqvarna Sewing Machines

1 Answer

The bottom stitch is very loose. I've tried tightening and loosening the screw and the problem remains...HELP!

The bottom stitch is affected by the TOP thread tension :) First go back and make sure your bobbin tension is correct since you adjusted it. It should drop slightly when held suspended by danging it by the thread. If it reels out to the floor it is too loose. If it doesn't drop at all it is too tight.

Now that you have that adjusted look at your top tension. If it is loopy on the bottom side of the stitch the TOP tension is too loose. Increase the top tension.

Now take some scrap material and set machine to a wide zig zag, medium length stitch and sew a bit. Compare the top and the bottom sides of the stitch. They should look identical. Remember the TOP side effects the bottom and the BOTTOM tension effects the top side. Adjust accordingly until they look identical with no loose threads or loops and no puckering (puckering means it's too tight).

May 03, 2011 | Brother LX3125 Sewing Machine

1 Answer

The thread underneath when sewing is too loosed

Usually thread too loose on the bottom is caused by the upper tension being too loose. The top and bottom tensions work together with the top thread making the underside of the stitch seem too taunt or too loose and the bobbin thread causing the top side of the stitch to be loopy or too tight. Select a large zig zag stick and sew a couple of inches. Then examine the stitch. It should look identical on both sides. Look to see which side is drawn too tight, the zig zag being smaller on that side with threads from the bottom threads pulled through. Then adjust the two tensions so that they make a uniform, identical stitch.

Also, when the bobbin tension is right you can hold the bobbin dangling by the thread and it won't spool out to the floor but will let loose a bit with a slight flick of the wrist. Too loose it will just spool out. Too tight and it won't drop at all. When you get that set right then do the above zig zag test to see where the top tension should be set.

Mar 02, 2011 | Sewing Machines

1 Answer

The bobbin thread is loopy on the under side of the fabric. I tried adjusting the tension setting but it didn't help at all.

Loops stitches on the underside is typically from the TOP tension being too loose, however it can also be the bobbin tension is too tight, or a problem with the needle. I would check them in that order.

Hold the bobbin thread and let the bobbin dangle. A slight shake of your hand should allow the bobbin to move downward (lets more thread out) but not so much that it just drops to the floor. When you put it in again and try sewing look at the top stitches. Do they look overly tight? THen the bobbin tension is too tight. The stitching should look the same top and bottom with no loops.

If both tensions seem to be alright check to see if the needle is: 1. the right size and type of the fabric 2. not bent

That should fix your problem :)

Jan 22, 2011 | Husqvarna Rose

1 Answer

Pfaff varimatic 6091 sew a rag quilt with jean and flannel,I can't get my tension right it seems to be funny on the bottom stitch,where shoulf the top tension be set at 4 1/2 ,when do I adjust the bobbin...

Hi! The bobbin tension rarely needs to be adjusted. First, make sure you're using the appropriate size needle and thread for your fabric (I'd probably use either a 'denim' needle or a universal size 14) and also that the upper thread and bobbin are threaded absolutely correctly. These can throw off the tension! Also, take the time to clean out the bobbin area. That can throw your stitch off also.

If the stitch on the bottom is loose, so that you see the top threads, then the top tension is too loose. If the top stitch is too loose and you see the bobbin threads on top, then the top tension is too tight.

It helps to thread the machine with different color thread on top and in the bobbin, and then stitch an inch or so on the same type of fabric as you're using in your quilt. Check the stitch. If you need to adjust the top tension, make sure the pressure foot is down! Adjust a little, stitch a few inches, and check again. Repeat until you don't see any (or very little) bobbin thread on the top or top thread on the bottom.

If you go through all these steps, and the bobbin thread is still loose (and you've tightened up the top tension), then there is a tiny little screw on the side of the bobbin case that you can use to adjust the bobbin tension. Turn the screw just a little bit (less than a quarter turn), stitch, check, etc. Once the bobbin tension is set, you shouldn't ever have to change it.

Let me know if this helps, ok?

Happy sewing!

Feb 10, 2010 | PfaFF Sewing Machines

2 Answers

Can't get thread tension right on my Euro-Pro 7130

the top seam is actually the bobbin thread. dots on the underside means that the top tension is too tight. you may have a piece of thread or something gummy caught between the upper tension disks.

Jun 08, 2009 | Euro-Pro Deluxe 7130 Mechanical Sewing...

1 Answer

Husqvarna viking, interlude 435...unable to solve tension problem

Sounds like the tension unit is at fault. First check the bobbin tension by removing the bobbin case. Use a half-full to 3/4 full bobbin. Be sure it is threaded through the bobbin case with thread hanging straight down with tension spring on top. Tie the stitch plate to the end of the thread. If the thread pulls the bobbin out, the bobbin tension is too loose. If it does not move when "jiggling" the bobbin, it is too tight (which is not likely based on your description). Small screw (through an open hole) on the side of the bobbin case adjusts the tension of the bobbin case. Left for loose and Right for tighter. Otherwise, contact local authorized Husqvarna Viking dealer for their assistance. You can find the closest dealer at the Husqvarna Viking website - Good luck.

Apr 13, 2009 | Husqvarna Viking 1

1 Answer

I am sewing on demim. The thread is inches loose on the back side... it is terrible. Not really sewn at all. I have changed the tension on top several ways but it does not seem to make a difference. I...

The manual can be downloaded for free from Singer's web site...
Are you seeing loops of the upper thread on the bottom side? If so, then the bobbin tension is too tight, or the upper tension is too loose. The threaded shaft on the upper tension might have stripped, leaving you with no adjustability.

Sep 16, 2008 | Singer 7462 Mechanical Sewing Machine

1 Answer

Brother PE-150V bobbin thread

For embroidery, and zig-zag, and because the needle makes side movements, it needs more needle thread.
So try to keep you needle thread not very tight,
and tight up your bobbin case tension more, so that the two threads meet under the meterial.

Apr 30, 2008 | Brother PE-150V Computerized Sewing...

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