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It is generally because you have not taken your knee completely off the knee lift.
Whenever you use your knee lift, it opens the thread tension and lets out more upper thread.
If you find out you are not leaving your knee on the knee pedal, try to only lift the foot as little as possible when you do your turn. I find out that when I am in a hurry I leave my knee against the knee lift as I am sewing and I have the same problem.
Good Luck. :)
The knee lever just pushes in to install, so it is logical that it should just pull out. You may need to apply some muscle and wiggle it at the same time. Possibly apply some heat from a handheld hairdryer. My last option would be spraying a little silicone spray into it.
Mine does this too sometimes. Lift up the head and look in the middle of the oil pan. The knee controller runs through there. Make sure the black knob is not stuck. Hit the knee thing a couple of times to make sure it is not stuck. It should move freely up and down. That may fix the problem. If not, look st the small post to the left and behind the oil intake. Move the manual presserfoot lever on the machine to see it move. It will be stiff, but it should still lift a little. Usually jigging these two parts will fix the problem. Good luck..
I don't know if you were the person that I was just writing to or not. I didn't think about the knee lift. I generally sew on a Juki DDL-5800 and we don't have the knee lift problem. I have an older walking foot with the knee lift. You might try what works with that one. Grab the front of the knee lift, push it towards the back and at the same time pull it up and left. There is a metal peg at the back of the shaft that will release and let you pull the knee lift out so that you can push the machine back. If that doesn't work, see if you can contact me and I can call someone else to find out.
Shirley :)
The Juki HZL F300 Exceed Sewing Machine is a classroom model and will exceed ...High speed sewing up to 900 spm, stitches per minute; Power at low speed ...
I imagine that it is the mechanical knee lift that you actually lift with your knee? Sometimes the screw that holds the knee lift rod comes loose a little and starts to slide in the holder. Sit on the floor where you can see the underneath of your table and use a wrench or vise grip to loosen the bracket that holds your knee lift bar with the pad on it. Move the bar to the left and retighten the screw and I think you will be ok. Sometimes if there is too much oil in your pan or you have moved the machine and some of the oil spilled out, a little oil gets out of the pan onto the bar and makes it start to slip. If that doesn't work we'll try something else.
tilt machine back and look at the lifter bar. try moving it now without any pressure on it. move ok then problem too much presser ft tension of the lifter plate on the vertical bar under the machine is bent or not high enough or not align with the botton of the part the machine thta connects to the presser ft. the lifter bar connected to the knee lifter can be bent to line up with the bar on the machine. go to the other side of the machine and look in thru the oil pan to see how they match up.
Check the tension unit, when you use your knee press a pin should open the tension discs then return to normal, check for any fluff in the discs as well
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