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According to the manual, you should not need to adjust the bobbin tension (and I located other sites which stated the bobbin tension cannot be adjusted on this machine). Apparently, all the tension adjustment is accomplished through the upper thread::
"EN Thread Tension Upper thread tension Basic thread tension setting: "4". (1) To increase the tension, turn the dial to the next number up. To reduce the tension, turn the dial to the next number down. A. Normal thread tension for straight stitch sewing. B. Thread tension too loose for straight stitch sewing. Turn dial to higher number. C. Thread tension too tight for straight stitch sewing. Turn dial to lower number. D. Normal thread tension for zig zag and decorative sewing. Correct thread tension is when a small amount of the upper thread appears on the bottom side of fabric. Lower thread tension The bobbin tension has been set correctly at the factory, so you do not need to adjust it. Please note: - Proper tension setting is important for strong seams. - There is no single tension setting appropriate for all stitch functions, thread or fabric. - A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch construction sewing. - 90% of all sewing will be between "3" and "5". - For zig zag and decorative sewing stitch functions, thread tension should generally be less than for straight stitch sewing. - For all decorative sewing you will always obtain a nicer stitch and less fabric puckering when the upper thread appears on the bottom side of your fabric. 1 A B C 22 D"
Doing further research, I found this statement on a machine review site:
"After reading reviews online from where I've bought my drop-in bobbin machines, I think many of the negative reviews are due to the bobbin thread coming up without laying across the bobbin. It can cause the stitches to look very sloppy and no amount of tension adjusting can fix the stitches."
There are several machine review sites wherein 4423 owners stated their disappointment in the 4423's performance. Some said the machine failed almost immediately and others said the machines developed problems when sewing heavy fabric.
loops under fabric means top tension needs to be tightened
try cleaning the top tension dial with some unwaxed dental floss and see if that helps. if it doesn't then the tension dial may need to be replaced
also check to make sure the spool of thread is not getting caught on the spool holder
also try a new needle--one that is correct for the fabric being sewed
You need to loosen the tension on the machine. There is a dial that has numbers on it. The higher the dial is set, the tighter the tension is. Turn the dial to the left one number. Then try it. Do it over and over. Do not turn the dial all the way down or you will mess up your machine. Do it slowly, one number at a time and try the machine between dials.
You can try "flossing" the tension with a piece of unwaxed dental floss, a dollar bill, or a piece of fabric to try to clean anything that is trapped between the tension discs loose. Be sure the pressure foot it up and the tension knob turned to "0" before trying this. Then dial back the tension to your normal setting and try re-threading your machine. If this doesn't work and you know how to remove and reinstall your tension assembly, that could be the next step. The tension discs do wear out over time, but sometimes it is just some lint that needs to be cleaned out.
A more detailed description would be helpful, but my guess is that you have lost all of your upper tension.
Unthread the machine.
Raise the presser foot.
Turn the handwheel until the take-up lever is at it's highest position.
Set the upper tension dial/knob to 5.
Thread the machine.
With the presser foot up, the upper thread should pull through easily and then grab when the presser foot is lowered.
The upper tension pulls the stitches up and the lower tension pulls the stitches down. When they pull properly, the stitch is even.
My guess is that you have lost all of your upper tension and you may have your needle in backward. Unthread the machine.Raise the presser foot.Turn the handwheel until the take-up lever is at it's highest position.Set the upper tension dial/knob to 5.Remove the needle and replace it making sure that the flat side of the needle shank is to the back.Thread the machine. With the presser foot up, the upper thread should pull through easily and then grab when the presser foot is lowered. Test sew. The upper tension pulls the stitches up and the lower tension pulls the stitches down. When they pull properly, the stitch is even.
I'm working on 2 different singers. One, Singer 3343C has upper and lower tension problems that turning the dial just doesn't help. How do I adjust the tension on this drop-in bobbin carrier? My other machine is Singer Model 15 (AL311850), I'm having upper tension problems and the machine is sewing loudly-it's never done that before. Help!