Juki Sewing Machines - Page 9 - Recent Questions, Troubleshooting & Support

Try searching for Juki HZL 7800 user manual may also try searching in YouTube, they usually have bobbin removal videos there i just fixed my machine with same problem, the distance between niddle and bobbin was out of adjustment. Try searching for service manual for your machine, they have all adjustment procedures there. I am not sire what the specs are for Yours, mine is Janome. there is three factors that may cause your problem. 1-niddle tip either too high or too low for bobbin hook to pick up 2- niddle tip is too far from bobbin 3- bobbin timing is out of adjustment I set all three according my service manual it runns better than new good luck!

You may not have the covers on completely right. May be a neutral safety shutoff thats not being pushed. Take it apart and try again

Loosen your top tensions (large tension near the needle, small tension near the top of the machine controls the tails on your back tack also) If it mess up the stitch on your work, you will also need to loosen the tension on your bobbin case. I usually start by turning the small tension to the left about a half turn, sew and see if that stops it, then if not, move onto more aggressive turns. Before you do any of this, make sure that your thread is coming off the cone easily and that the thread isn't being held up by the thread stand or isn't wrapped around the peg that is the first hole in your threading. Good Luck, :)

Oil generally helps. Put a couple drops of oil on screws and let set a while.

1. HOWEVER, If you have had a thread stuck in your bobbin, it may have used its safety feature to keep you from ruining your machine.
2. Tip the machine back and use flashlight to make sure that your bobbin case is either out of the machine or in the machine correctly. If you think you have a thread hung up in the hook, take out the bobbin case, put a drop of oil where the hook moves and if there is a thread in there I usually use needle nose pliers to pull it out. It sometimes takes a few minutes to work it loose.
3. NOW put the machine back down. There is a small button in the middle of the bed of the machine, about half way between the needle and the reverse lever. Push down hard with your left hand on the button and hold it down while you are turning the hand wheel towards you slowly. You should soon feel a click on the button as the machine goes back into sewing mode.
4. Put your bobbin and bobbin case back in, pull your thread up and test sew.

Good Luck :)

There is a clear oil gunge cap on top of the machine.It probably is clear and has a small red line on it. Grab hold of it (if it hasn't been oiled in a while, you may have to use pliers to twist it counter clock wise. If you do, put a small scrap of material between the plastic cap and the pliers so that you don't make rough places on your cap.). Once you have taken the cap all the way off, fill it with sewing machine oil (not car oil, not WD-40, etc.) When you are pouring it in, be slow. The actual oil gauge is on the right lower front. Pour only enough oil to be between the two lines on your gauge window. If you over fill, it will bubble out the bottom, run out the bottom of the machine and go all over your foot pedal etc .Irritating but not a crisis. Be sure to put your cap back on securely before you try to run it or you will be cleaning up all around your machine and you may get a shower also. Once your machine has oil, run it fast every so often and the oil should bubble up in that top cap as you sew. If it doesn't, you may need a new oil pump. Good Luck! :)

1. Make sure that your bobbin is all the way into the case
2. Make sure that your needle is up out of the machine
3. The half circle that is cut out of the bobbin case always goes towards the top.
4. When you grab the tab on the bobbin case to put it in to the machine, it keeps the bobbin from falling out while you are trying to get it into the machine.
5. If you still can't get it in, take a flashlight and look at where you are putting the bobbin case. Sometimes the thread from the spool on top has wound around inside the hook and won't let your bobbin case go in. If this has happened, you need to take a sharp pair of scissors or seam ripper to cut it out and then clean all that thread out and try it again.

Good Luck :)

1. I am surprised that you have to set the needle bar but put a NEW needle in the bar or make sure that the needle set screw is to the right side of the bar
2. If your needle bar is already loose, there should be two small lines about 1/4" apart on your needle bar, where you can see it between the needle and the underneath of the machine.
3. The needle bar height is set when the top line is flush with the body of the machine. Tighten your needle bar screw.
4. Now wind the hand wheel towards you until the 2nd line is flush with the body of the machine. Push your machine back so you can see the hook. Set the tip of the hook one thread away from the scarf of your new needle and in the middle of the needle. Tighten the screws on the hook, put the machine back down (make sure that you have put your bobbin case back in) and test to see if you can pick up a thread when you wind your hand wheel towards you.
5. If you are not picking up the thread, I find that I have to put my throat plate back on to pick it up most of the time.You may have to redo this several times especially if your hook is old and worn. It's possible but harder.
6. Good Luck. There are a couple people on youtube showing how to time a sewing machine. They are all pretty much the same. It doesn't have to be someone who is especially trying to time a 555,

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. :)

Check to make sure that your needle is completely inserted up into the machine, and that it is straight with the proper side towards you (just in case you don't know: the 'ditch' that runs from the eye of the needle all the way up the needle to the part that inserts into the machine, is the front of the needle). Check to see if the needle is the proper size. A wrong length needle or a size that is much smaller than you had been using (say you had been running a size 18 and decided to go down to a 12 for finer fabric) will sometimes require resetting the looper because it isn't able to grab the thread because the needle is too far away..A mechanic needs to do that. Last but never least, you may have hit the end of the looper and chipped the end. If you have done that, unfortuneately they don't heal them selves and you will need to............you guessed it!.....call your mechanic. Once in a while, there is a rough place on your plate or the wire on the tension for that thread has a small groove cut in it from the thread and you would need a new wire in your tension, Look at the needle problems first.If your machine was sewing fine before, it is probably the needle, If the machine is new to you, the other things could be the problem. Good Luck, :)

If it is 110 motor, check with your mechanic. If it is 220/3 phase industrial, your poles are reversed and you need to turn your plug in the overhead rail or have the mechanic reverse the wires.

I am surprised that I couldn't find threading directions in the manuals that I found. It appears to me that you can thread it the same way that you would thread a Juki DDL 555 or DDL 8700. Manuals on Line have several manuals but I couldn't find threading directions in them. Weird. Most sewing machines thread similarly whether they are home or industrial machines. Once in a while there will be an odd one. Sergers, etc are another matter but sewing machines are generally alike in their threading.

It's an adjustment on the thread cutter. It is cutting the thread too close.

Did you get this fixed? Most common problems: 1. You broke a needle and the hole in your needle plate now has grooves cut into the edges of the hole that are grabbing your upper thread and holding it too long for the hook to grab it. Take your needle plate off and examine it closely with a magnifying glass. If there are grooves, purchase some emery cord and run it back and forth until the edges are smooth or buy a replacement plate. 2. You broke a needle and you have rough edges on your hook. Lean your machine back and examine the hook with a light. If there are rough spots on the edge of your hook, you will need to smooth them out with emery cloth. 3. You have either the wrong size needle or you have the needle in backwards or not perfectly straight and the hook can't pick it up each time. 4. Have you changed to pre-wound bobbins? They may not be large enough for your bobbin case. If you have regular bobbins, check to make sure that the bobbins don't have burrs on the edge of the bobbins. If they do, throw them away and buy new bobbins. Sometimes I get some bobbins that are not quite round. Weird but true. Examine them. Good Luck.

I'm not truly sure about this problem. It might be a good idea to just unplug the machine for about a minute and then plug it back in. If this works then great. If not you will need your repairman check it out.

Make sure all working parts are lubricated sufficiently if not parts will overheat enough to jam ,once they cool down the machine will run again for a while but will most likely jam again

Hi, if you have cleaned it, make sure the faceplate is screwed down tightly and another cause could be an old needle. Ideally, you should replace your needle after every major sewing job. :-)

Some machines have a lever or switch that disengages the feed dogs for lightweight or fragile fabrics.

called bird nesting and is fixable by increasing the needle thread tension right up

too easy to answer> do you know how to use google ? watch the videos. doh. https://www.google.com/search?q=threading+juki+2030&ie=utf-8&oe=utf-8&client=firefox-b-1-ab