Question about Juki TL-98Q

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Loose stitching underneath. HOW CAN I FIX!!!!

When using machine, there seems to be loose stitching with BIG looping underneith. Have tried thread tension and tighting and loosening. Does alright with straight stitching, but freehand stitching causes problems. Please help!!!. Thanks My machine is throwing loose stitches on the bottom from the bobin side with a straight stitch. I have re-threaded, replaced needle, and cleaned bobbin area. My problem started when a needle broke.

Everything looks fine, but I cannot resolve problem. Please help.

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  • Anonymous Sep 10, 2008

    I am having the same problem with my Juki TL-98Q regarding loose stitching from underneath. When I first noticed the problem I called the person from whom I purchased the machine. The technician in their shop walked me through rethreading the machine, readjusting the tension, and cleaning and oiling the hook area of the machine. At the time, it appeared to help the situation. Since the problem appeared to be solved, I put another quilt on the frame and began quilting. About halfway through the project, once again the stitching from the bottom side of the quilt resulted in large loops. I read the solution offered to dwattstgtel, but I do not have any rough spots on the hook. Please help. This is the second quilt that has been messed up because of this problem, and I am ready to get rid of this machine.

  • Anonymous Mar 19, 2014

    Pfaff 6122 bobbin stitch loose, makes straight line

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  • 323 Answers

Sounds as though you may have a burr or rough spot on the hook where the bobbin inserts. Run your finger along the edge of the hook to see if there are any rough spots.I'm sure you're going to find at least one from the time you broke the needle.Once you locate it, remove it with an emery stick or small sharpening stone. Polish it so that it is smooth. Should work okay.
sewman7

Posted on Jun 27, 2008

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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.

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Here are some things to try:
Big loops are actually easier to solve usually. 1st know this: Loops on bottom means the top is too loose or the bottom is too tight. With loops that big its probably the top is too loose. 1st look in tension disks, there is likely a chunk of thread in there. A toothpick is handy to dig it out (the flat kind) 2nd make sure that the thread is getting between the disks when threaded. 3rd Make sure the thread is in the take up lever (the thing that moves up and down in front and not the needle bar or any part of the needle bar.) If neither, then the bobbin case could have a burr on it and the thread is hanging on that burr. Also the bobbin case may be in wrong. I hope this helps
Tension:
If the thread is loose on the bottom of the fabric, it's actually the top thread is too loose. Think of 2 little elves playing tug of war in your machine, one on top and one underneath. If you have loops on bottom, the top needs to pull harder (tighten top tension
Thread test
Test your thread quality to start, thread your machine and LIFT the presser foot (this opens the tension disks). Pull your top thread straight back. If you feel no tension no matter how much thread you pull, your thread is good. If that your machine passes that test, we can go to step 2. If not, try different spool of thread, do the same test until you get a smooth pull (tip: always check your thread this way when you thread your machine)
Step 2:
Pull on your threaded bobbin thread while it’s in the machine. Does it pull smooth and even? If so, go to step 3. If not, try a new bobbin (bobbins get bent or distorted if wound too tight).
Clean thoroughly in the hook and bobbin case area and oil 1-2 drop is all.
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