I have owned this machine for several years and this is the first time I have had a problem with the bobbin tension. It seems to be tight enough when I **** it in fact it seems almost to tight but when I sew a straight test strip the top stitches are looped underneath and you can pull the bottom thread straight out. If you do more than 3 inches it will start to gather and then break the bobbin thread. Is this adjustable or am I going to have to get a new bobbin? I haven't sewn in a few months but I would not think that would be the problem. I have also cleaned and oiled it. Thanks for your help. Sandy
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To access the tension disks, remove the top of the machine as follows: 1. With the carrying handle raised, remove the cover (the piece that has all the stitches pictured). 2. Unscrew 2 screws completely; one is in the depression where the thread spool goes and the other is right behind the bobbin winder. 3. pull straight up. You may have to jiggle it a bit. 4. you should be able to see the tension disks from here.
If the thread is looping underneath, you're top tension may be too loose or the thread may not be in the take-up lever. If it's looping on top, double check that the thread is in the bobbin tension or that the bobbin tension isn't too loose.
Simply loosen the screw on the bobbin winder stop, no more than 1 full turn or you will drop the backing nut will fall down into your machine, move the bobbin winder stop slightly to the left then tighten the screw and see if that works. you may have to repeat this step several times until you find the right spot to stop the bobbin at the correct point.
Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.
Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.
Check your bobbin tension also. Embroidery bobbin thread is finer than sewing thread and you may need to make adjustment on the bobbing case by turning the small screw slightly. The type of stabilizer can affect your embroidery. An excellent reference for machine embroidery is Embroidery Machine Essentials by Jeanine Twigg, available on Amazon.