Question about Juki MO-644D Mechanical Sewing Machine

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I have Juki MO-644D It has been working very well untill now

I have Juki MO-644D It has been working very well until now. Using 4 threads it leaves loops all over the bottom of the fabric and the chain without the fabric is scalloped very uneven. When using three threads to hem it works great for a few inches and then stops sewing at all, but take the fabric out and the chain looks great. What could be the problem?

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Have you got the solution to this, cuz mine is doing the same... :/

Posted on Aug 27, 2010

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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

Using Juki DDL555, Thread breaks when trying to hem jeans


Sometimes using a larger needle will help. That is if it's shredding the thread when it goes through the needle which causes it to break.

Mar 25, 2013 | Juki MO-644D Mechanical Sewing Machine

1 Answer

I need replace thread holder for Juki MO-644D serger


Good luck. I found a replacement part for one of mine on Ebay. Just search for Used Juki Serger for parts. Maybe you'll find a 644D for cheap enough that you can scavenge parts for a few more years.

Oct 25, 2012 | Juki MO-644D Mechanical Sewing Machine

1 Answer

Right needle will not stay threaded and sew


try using a longer thread tail of 4 to 6 inches, that what I do & my
needles never come unthreaded

Aug 12, 2012 | Juki MO-644D Mechanical Sewing Machine

1 Answer

Serger motor locked up completely


I suggest taking the machine in to be serviced

Jun 09, 2012 | Juki MO-644D Mechanical Sewing Machine

1 Answer

Tension settings juki mo-644d


-If the machine is threaded correctly and the thread is flossed into the tension discs,
-if the thread is high quality and not cheap thred
the top tensions should be at 5-6 and the looper tensions should be at 4-5
Be sure it is threaded correctly (follow the threading map on the inside of the front cover of machine
Also be sure you are using a size 14 or size 90 standard Schmetz needle do not use Klasse needles
as these are to short and affecdt the timing.
drtension

Apr 24, 2010 | Juki MO-644D Mechanical Sewing Machine

3 Answers

Good diagram showing how to thread a 4 thread Juki 644d serger we do not have a manual machine is not clear


You can download a free threading guide here - http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Juki_Sewing_machine_threading/Juki_MO_644_Threading_Diagram.htm

The same site also sells manuals.

Threading Tips:

Have the thread antenna at it's highest position.

Set the tensions to zero.

Have the presser foot up while threading.

When you thread a serger for the first time, or if you are having a threading problem, use a different color thread for each guide. This can quickly indicate where the problem lies.

Once the stitch is satisfactory, change to the color you prefer - but this way is the easiest - cut the thread near the thread cone and tie off with the new thread. With the tensions at zero, slowing run the serger until the new thread appears. You will need to stop as the knots approach the needles and thread them by hand.

Do the tie-off before running out of thread and this will save a lot of time and stress.

Mar 02, 2010 | Juki MO-644D Mechanical Sewing Machine

1 Answer

How do I thread the Juki MO-644D?


Email me at sewingnz@gmail.com should be able to help.

Jan 19, 2010 | Juki MO-644D Mechanical Sewing Machine

1 Answer

THREADING FOR JUKI MO 357


Put new needles in it.

Following the colors, thread the upper looper first, then the lower looper. Next thread the needles. Always thread in this order.


Jun 27, 2009 | Juki MO-644D Mechanical Sewing Machine

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