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The tension of the top thread and bobbin thread are in a "tug of war". If the top is "winning" or too high then the bottom thread will be showing on the top of the fabric. If the top is "loosing" or too loose then the top thread will be pulled through the fabric and show a lot on the bottom. They must be evened out so the "tug of war" is even so the knot is in the middle of the fabric.
START WITH BOBBIN FIRST: Remove bobbin and bob from finger. When you have it adjusted right then the bobbin will extend one inch when you bob it. If you can't bob your bobbin you will have to make an approximate and replace. You may have to do this a couple times to get it right.
WHEN IT'S RIGHT: The bobbin and top tension are equal without being too much pull on both that causes the fabric to pull together.
THE BOTTOM AND TOP THREADS ARE IN A TUG OF WAR. WHEN THE TOP IS TOO LOOSE THE BOBBIN WILL BE PULLING HARDER THAN THE TOP THREAD SO A GREAT DEAL MORE THREAD WILL END UP ON THE BOTTOM. TO CORRECT THIS YOU INCREASE THE TOP THREAD TENSION. IF THE TOP THREAD IS PULLING HARDER THAN THE BOTTOM THEN A GREAT DEAL MORE BOBBIN THREAD WILL END UP ON THE TOP. TO CORRECT THIS YOU WOULD LOWER THE TENSION ON TOP.
Load your sewing machine with one color on top, threaded through the needle. Load the second color thread into the bobbin and thread.
Fold the scrap fabric in half, and sew a straight stitch at least 2 inches long. Look closely at the seam. If you see loops of the bottom color thread on top of the fabric, proceed to Step 3. If you see loops of the top color thread on the bottom of the fabric, proceed to step 4.
Loosen the top tension. Since the top tension is so tight, it is pulling the bottom thread up through the fabric. Loosen the top tension by turning the numbered knob on the front of the sewing machine counterclockwise by one number.
Tighten the top tension. Since the top tension is too loose, the bottom thread is pulling the top thread down through the fabric. Tighten the top tension by turning the numbered knob on the front of the sewing machine clockwise by one number.
Sew a straight stitch 3 inches in length. Check the stitching. It is perfect if the threads meet in the middle, and you can only see the top thread on top and the bottom thread on bottom. If it still needs adjusting, go back to step 2 to repeat the needed steps.
Using two different colored threads makes it easier for you to see which thread is being pulled.
Always use proper precautions when working with electrical machines.
This is a tension adjustment problem. It's good to use two different colors of thread, like you did. From your description, the top thread (needle thread) tension needs to be tighter. As you tighten the tension of the top thread, you'll see that the top thread pulls the bobbin thread up into the fabric so it's no longer laying loose on the bottom of the fabric.
You'll need to have the pressure foot down when you tighten the tension. Tighten it a little, sew a practice seam, check to see what the stitch looks like. Tighten it a little more, sew, check, etc etc--until both top and bottom look the same--you shouldn't see much (if any) of the bobbin thread color on top of the fabric or the top thread color on the underside.
when the needle pulls the fabric into the feed dog you dont have enough fabric behund the neelde when you srart, and the fabric gets caught in the feed and the bobbin case underneath clean it out anf change the needle they often get bent after they get tangled in the thread and fabric
DO NOT RESET THE TIMING!! The timing is off on maybe 1 in 100 modern Husqvarna machines. For the user to change the timing is turning a simple fix into a complicated and expensive fix. If the top thread is "looping up on the bottom" then you have a problem with the tension on the top thread. Here is what to check: 1. Thread the machine all the way through the eye of the needle. Don't go under the foot. 2. Pull the tread to the side. While pulling, lower the presser foot. You should see the needle bend as the thread gets tight. If not, you have no tension on the top thread. 3. With the bobbin in the case, hold the needle thread and turn the handwheel to bring the thread up. Watch through the cover to see if the thread passes over the bobbin from left to right. When it gets to the right side, the take up lever should pull the slack out and the thread should be pulled up. If it comes part way across but does not pull up, make sure the thread is in the take up lever. If you never see the thread, remove the bobbin case and turn the hand wheel. You should be able to see the hook pass behind the needle while the eye is still below the level of the hook. If the eye is above the hook as it passes the needle from right to left, then and only then consider timing the machine. If the hook passes above the eye but doesn't catch the thread (bobbin case out, needle plate on, presser foot down) you probably have a problem with your needle. Put in a new needle and make sure that the flat side is to the back. 99% of the time when a Husqvarna is not picking up the bobbin thread, something simple has been overlooked. Your symptom of looping on the back of the fabric indicate either a threading or tension issue in most cases, not timing.