Question about Juki MO-644D Mechanical Sewing Machine

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Cant get the tension rite on m sergery juki mo-3614

The tension looks pretty good on the top surface, but the underside is all loopy. is there any way to know how to adjust the tensions to make a smooth stitch?

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  • 26 Answers

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

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Posted on Jan 02, 2017

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2 Answers

I have a brand new Juki MO-50e and the threads are loose on the back of the fabric, how do I fix this?


  1. . re-thread your machine with a rainbow of colors. (important that you remove the existing threads if you are not sure it is threaded properly.) make sure you are lifting the presser foot while rethreading.
  2. Sew a good 6 inches.
  3. Look to see which threads are the offenders and tighten the co-responding tension knobs a little.
  4. Sew another 6 inches. Examine the result. Adjust tension again if needed.
  5. Work this way until you have the stitch balanced.
  6. Finally when your stitches are perfect. clip the threads at the spools in back. And tie on the coordinating colored thread for your fabric.
Get used to this procedure since it is common to have to adjust tensions when you change fabric. Good luck!

Oct 23, 2014 | Juki MO-644D Mechanical Sewing Machine

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

Back thread loose and loopy - tension


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.

Feb 20, 2012 | Juki MO-644D Mechanical Sewing Machine

1 Answer

I have a Juki 654 Pearl - and the thread is looping on the underside. Tension adjustments don't seem to solve the problem.


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.

Mar 17, 2010 | Juki MO-654DE 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

1 Answer

I have a juki mo-3614 serger and I can't seem to get the blades lined up right for cutting. It just seems to want to roll the fabric instead of cut it. How do I line up the blades the right way.


first, pull out the bvlades and make surte they are sharp. It could simply be that they are dull. Next, line tyhe bottom blade up level to the surface of the needle plate. The top blade should be adjusted to where it slices against the botom blade. You may have to experiment with the height adjustment on the top blade, assuming you have a suitable cutting edge.

Nov 29, 2008 | Juki MO-644D Mechanical Sewing Machine

1 Answer

Loopy stitches on the back


I have no real solution for your serger, but keep in mind that stitches on the bottom of the work reflect upper thread tension problem, while top stitches are a problem of the bobbin tension( FOR THE MOST PART)

Oct 13, 2008 | Juki MO-644D Mechanical Sewing Machine

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