Question about Juki MO-644D Mechanical Sewing Machine

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Should the right hand needle be slightly longer than the left after changed? The right hand needle hangs a bit longer than the left. Is this correct?

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  • Juki Master
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Yes, needles are usually offset on sergers, one will be lower than the other.

You can download a manual from here: http://www.jukihome.com/products/mo644d.html its a pdf icon on left of screen, page 11 covers needles and the right needle is lower. It also says to change the right needle first, then the left one and to use a JL x 2 needle in the left side for heavy weight fabric.

Don't know with the Juki but I know my Bernette prefers the serger needles as they have a scarf/groove in the front as well as the back, ELX705, otherwise they are the same length as the standard domestic needle 130/705H.

Also, never unscrew the needle screw too far out, just enough to get the needles out and in, as there is sometimes a ballbearing up in the housing between the two needles and if you wind out the screws too far, this may drop out.

Posted on May 23, 2011

  • Tally Girl
    Tally Girl May 23, 2011

    sorry, on the Juki website, click "Features" dialogue to find the manual link.

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Needle hits the quilting presser foot


Needle may be slightly bent. Needle may not be properly or fully inserted into the needle clamp or holder. Needle may even have a burr on it or be too dull. Needles must be changed fairly often, especially with many of the modern synthetic fabrics. They do not last forever.

Change the needle first, for a new one, be sure it is properly inserted. Then, make sure you have not accidentally set your stitch width incorrectly. I've done that myself after using a zig zag stitch mode and forgetting to change it, or not change it all the way back to straight stitching.

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the needle isn't correctly seated in the needle clamp
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The thread is not picking the bobbin


The bobbin may be in backwards
the needle is not the correct one for the machine
the needle isn't correctly seated in the needle clamp
the machine is a little bit out of time.
Remember to hang on to the needle thread when you're trying to pick up the bobbin thread
Turn the handwheel in the direction that would advance the fabric from the front to the back of the machine
make sure the bobbin-winding spindle has been pushed back to the left for sewing
make sure your needle is inserted correctly as far as it will go with the flat side facing back
and that the upper tension disks of your machine are threaded correctly.
Make sure the presser foot is up when seating the thread through the upper tension.
Turn the hand wheel (TOWARDS YOU ONLY) never turn the hand wheel away from you and hold the needle thread lightly. .
pull the loop up and then pull both threads (top and bobbin) under the foot and toward the back of the machine.
Also could be a timing problem

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look in the manual
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try rethreading the machine incase the thread is caught somewhere

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As the needles raise, the upper looper should move to the right with the right needle tip slightly above the eye of the looper.

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When putting the bobbin back in make sure you keep a good amount of thread hanging out and manually turn the hand wheel around until the needle make a full rotation. The hook should catch the needle thread and allow you to pull the bobbin thread out through the needle plate.
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