Question about Juki MO-644D Mechanical Sewing Machine

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Back thread loose and loopy - tension

I just recieved my new Juki. The top stich is beautiful but the underside on the bottom thread has huge and erratic loops that won't tighten. I have tried loosening and tightening all four thread tensions and nothing helps - help!

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  • 107 Answers

If you have the instruction manual, you might read the chapter which describes the proper adjustment for threads and fabrics.
If you do not have one, try to find it on eBay. It is the huge source of everything.

Posted on Feb 21, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: how to adjust the stich lenght on a juki ddl 553 strite stich.

press the black button while moving the side

Posted on Jan 25, 2009

  • 26 Answers

SOURCE: cant get the tension rite on m sergery juki mo-3614

always remember to keep the tension the same and try to fix all other things Try to clean the machine I use canned air it is the best thing going. then check the needle is it bent or is the end burred well replace it any way. and each fix try the machine. only change the tension as a last resort and always note the positions and put back to that and if you take the machine in to be fixed leave the bunched up fabric and thread as it is this will give the repair person something to look at.

Posted on Mar 08, 2009

  • 11 Answers

SOURCE: I have a Juki 654 Pearl - and the thread is

Your hook might not be timed correctly. Sometimes a thread or fabric jam can dislodge the hook. When your needle is just starting to move upward from its lowest position, the eye of the needle should be just below the hook.

Posted on Mar 17, 2010

  • 2 Answers

SOURCE: hi, I have a Juki

Did you figure this out? Does the Juki DDL-552 zig zag (304) or just straight stitch (301)?

Are you trying to adjust the length? the zig zag width? or the actual TYPE (eg. locking stich, blind stitch) of stitch?

Posted on Jan 08, 2012

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Juki DDL 8500: Bobbin thread is not coming up to the top side and the top thread is looping on the underside. Bobbin thread slides right out, and I've had no luck adjusting the top thread tension.


What thread are you using and what are you sewing? I'm assuming the machine is stitching correctly and it is just a tension issue. I would test each thread seperatly by hand and see if one thread is too tight or too loose. Thread on the bottom usually mean the top thread is too loose however it could by the bobbin is too tight. It could also indicate a slight timing issue or a burr on the hook. Is the thread shredding or getting damaged?

May 02, 2015 | Juki Sewing Machines

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I have juki 1541industrial machine . It started sewing upside down . Instead of nice stiching on top show side it on bottom. Any ideas


This is caused by the tension between the bobbin and needle threads being out of balance. If the knots between the stitches are on the bottom side, then you need to tighten your needle thread tension a little at a time until the knot is in middle of fabric. The reverse of this is if the knots are on the top, then either your bobbin tension is too loose or your needle thread tension is too tight. If this occurs, then loosen your needle thread a little at a time to see if knot goes down in middle of fabric. If it does not, then you need to increase the tension on your bobbin thread. This done by taking bobbin case out and tighten the small screw located in the middle of the spring on the side of the case. You only need a slight, steady pull on the bobbin thread - the more you put on the bobbin, the more you are going to have to put on the needle thread.

Feb 13, 2015 | Juki Sewing Machines

1 Answer

My stiches are loose on the bottom of my banner - is it the bobbin or a tension issue?


If the threads on the back are loopy, you need to tighten the top tension. If you have a spare piece you may want to run some of the plastic through the machine until you get the tension correct. If the top tension is too loose, the stitching will just pull out.

Jul 16, 2014 | Juki DDL-8700 Industrial Straight Stitch...

1 Answer

Juki ddl8500


try adjusting the top thread tension

Apr 28, 2012 | Juki Sewing Machines

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

2 Answers

Tension problem


Set the top tension as recommended by the mfg - this is usually between 3 - 6.

Now re-thread the machine with the presser foot up and see if this doesn't eliminated the loopy stitches.

What appears to be an issue with the bobbin may actually be the top thread was not seated into the tension during threading and the tension cannot control the flow of thread to the needle and you get a loopy stitch.

Keep the bobbin case clean as built-up lint can cause stitching problems.

Feb 20, 2010 | Brother LS-2125 Mechanical Sewing Machine

2 Answers

Tension is gone loopy stiches both top and bottom.


Lift the presser foot when you thread the machine and this should resolve the problem.

When the foot is up, the tension is open and can accept the thread as it should.

When the foot is down, the tension can control the flow of thread according to the setting you have selected.

Feb 19, 2010 | Brother LS-1217 Mechanical Sewing Machine

1 Answer

THREAD GET BUNCHED UP UNDERNEATH THE FABRIC, THE STICHES SEEM TO BE INCOMPLETE THE TOP LOOKS GOOD THAN I TURN IT OVER AND THE THEAD IS BUNCHED AND LONG LOOPS OF THREAD ARE LEFT. THANKS LOU


Hi Lou! This sounds like a tension problem--the tension on the top thread is too loose. Try using different color threads on the top and bobbin, then carefully rethread everything. Stitch a couple of inches and check the underside. If the top stitches look fine and the bottom ones are loose and loopy, and with the pressure foot down, tighten the tension. Move the knob or dial (whichever you have) just a little bit. Sew a couple of inches more, and recheck. Continue to sew and recheck, gradually tightening the tension, until you see little if any bobbin thread on the top or top thread on the underside of the fabric.

Let me know if this helps, ok?


Robbie

Jan 27, 2010 | Singer Sewing Machines

2 Answers

I bought a second hand Juki industrial machine , model DDL 5550-7, but struggle to get the tension of the stitches right. where do you set the lower stitches tension


upper tension sets the lower thread tension (upper thread is what you see on the underside of the fabric). Bobbin tension is for the thread you see on the top of the fabric

Jul 01, 2009 | Juki MO-644D Mechanical Sewing Machine

2 Answers

Bobbin thread bunches up creating a tangled mess under the plate


This could either be due to the bobbin being wound too loosely, or the tension on the top thread is too loose. This just happened to me the other day, and I thought it was the bobbin thread, but then I put another bobbin in with a different color than the top thread (this is a huge help in diagnosing thread issues), and I was surprised to find that it was actually the top thread that was a big loopy mess on the underside of the fabric. I fixed it by tightening the tension on the top thread (quite a bit), and everything was fine.

Jan 23, 2009 | Husqvarna Viking 1

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