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

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  • 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

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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

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Singer 2517c. When sewing, the bottom stitch is using to much thread, excessive amounts & the stitch isn't tight. I've tried all settings & have used a new bobbin. I'm at a loss......


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

Dec 30, 2012 | Sewing Machines

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Juki ddl8500


try adjusting the top thread tension

Apr 28, 2012 | Juki Sewing Machines

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New Home ss2015 machine. I am having trouble with the thread tension. I have loops on the bottom. I have cleaned the bobbin case, changed the needle, re-threaded and moved the upper tension all the way up....


try adjusting the top tension to 3 & if it doesn't stop the looping, try 4 but I wouldn't go any higher than 5,, if changing the top tension doesn't help then I suggest taking the machine in to have it serviced. the bottom tension is more difficult to do,, it's also very possible that the top tension dial is messed up & needs replacing. only a sewing machine shop can tell for sure.

Mar 02, 2012 | Sewing Machines

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My singer sewing machine model # 774 will not produce a lower stich that is not all jumbled on the underside of the fabric. The upper stich is fine, it's the bobbin stich that comes out all jumbled. ...


Looping thread underneath is a top thread tension issue...

I have written a 5 page illustrated Tutorial on overcoming this problem....HERE


Nov 08, 2011 | Sewing Machines

1 Answer

Stich is loose on underside of fabric


You probably need to adjust the tension. Let me give you a general lesson in adjusting tension that works for any machine. Also, I suggest you thread the top of your machine with a different color thread than the bobbin-it makes it much easier to see what is going on.

Thread your machine with the presser foot UP. The disks that control the tension (threadgoes through them) are tightened up if the foot is down. Change the machine tension with the presser foot DOWN.Because the disks won't be engaged (see above) if the foot is up, the diskswon't move. Start at the middle setting, 3. Go up to tighten, decrease toloosen. Each machine is different, even 2 different machines of the same model.The best thing to do is start at 3 and use a different color in the top andbobbin thread so you can easily see what changes to the tension do to yourstitches. Now use a straight stitch a sew 3 or so inches. Take a lookat the top and bottom of the fabric. You don't want to see any (or at least notmuch) of the other color showing from the other side. Loops on the bottom of the fabric means you need to tighten(increase) your top tension. If you're stitches on the bottom are causingpuckering, then you need to loosen you're top tension. For the most part, youreally don't want to touch your bobbin tension-leave that to a repairtechnician. The factory setting shouldn't be touched except by someone whoreally knows what they're doing. Keep sewing a few inches at a time until you have the resultsyou want. Now you're tension is where you need it!

May 18, 2011 | Toyota Sewing Machines

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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

1 Answer

BOBBIN TREAD LOOPING UNDERNEATH


looping thread on the bobbin side means that the upper tension is too loose... make sure it's threaded correctly.

Jun 14, 2009 | Feiyue FS288

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