Question about Juki MO-644D Mechanical Sewing Machine

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JUKI MO-634D trouble

Last time I used machine it worked fine. This time the motor can not turn it over and turning by hand it is harder than it normally is.

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  • Anonymous Feb 06, 2009

    I have a similar problem. I have the Juki 655D in its cloned version: the Bernette Funlock 008. And when I adjust the cutting width knob away from the setting 1 (towards 2) the machine simply won't run. You can press on the foot pedal all you want and the machine simply won't move. Can anyone help explain to me whats happening and what I should do about this. I bought this machine second hand and it works well on cutting width 1 but if you move it to 2 (which I'm told is more standard) it freeze up. Please help. Your comments will be most appreciated. Thanks.
    Jan

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Well, you might just need a good oiling. Make sure the machine is not threaded and there are no thread snarls where the loopers interact. It also pays to insert new needles and observe the loopers and needles interact. they should come withn .01-.5mm of touching eachother; there should be no hard positive contact between loopers and needles. So, if its tight to turn over by had, this is usually a cam or bushing that need oiling, or thread that got sucked into the machine and is binding the thing up. What I would do is remove the covers, slip the motor belt off, turn over by hand. If it frees up, the bind is in the motor, if its still tight, then id look for thread, and oil the machine with a light weight oil (sew mach oil, tri-flow... NOT 3in1 oil!). If you have a keen eye, you can wiggle the handwheel and try to observe what parts are moving slightly, and which are not. using that method you may be able to track the bind to a section of the machine or even a specific shaft/cam/component of the machine. Another common bind point in sergers is where the knives mate. Move the top knife to its idle (non cuttin) position and see if this relieves the bind.

Posted on Jun 27, 2008

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It is a good habit to take a few minutes to clean and oil your machine before you start sewing. Look for the oil points and give it one drop of quality sewing machine oil in each port.

Now let's try to determine why the hand wheel isn't turning. Loosen and remove the belt from the large reducer wheel under the table to the sewing machine. Try to turn the hand wheel. If it does turn.... Good! If it doesn't turn... we know the problem is in the the machine head and not the wheels below.

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