Have you tried to reset the tension dial?
SOURCE: bobbin?
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.
SOURCE: Thread is bunching underneath fabric
Needle in correct? Be sure your bobbin is not in upside down and turning the wrong way. Possibly the hook that the bobbicase fits in/on has been hit by a needle and caused a burr that is catching the thread as it comes around. The burr would have to be polished off or hook replaced. The machine could be slightly out of time also.
SOURCE: Not picking up the Bobbin thread
Sounds like you have to take off the throat plate and clean out threads under it. Sometime they ball up and prevent the needle from going down and catching the bobbin thread. You can't see themuntil you take off the plate. Follow the directions. It is easy.
SOURCE: viking husqvarna classica 100, thread tension
I suspect you are correctly threading the machine but the timing of the needle and bobbin hook is off. When the threaded needle goes into the bobbin area, a pointed hook grabs the thread and loops it with the bobbin thread. Something is catching when the needle starts to come up that is not allowing the bobbin thread to be pulled back through the needle plate opening by the upper thread. With machine threaded and bobbin in place, have the bobbin area open if possible and watch the thread interaction when the needle goes down. To set the hook/needle timing, normally covers have to be removed. Suggest taking it to an authorized Husqvarna Viking dealer for service. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.
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