If the entire assembly has fallen out you will find if you remove the top left hand cover that there is a small screw in the casting where the tension assembly goes, replace the tension body to the correct position and tighten the little screw.
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Wow, one of the few Singer machines that doesn't have a free download manual. Hmmm..... Ok looked up a photo of your machine. It's pretty easy.
1. raise your presser foot. 2. Put thread on spool pin. 3. draw thread over to and under from behind of the pre-tension disc at top 4. Draw thread down from the right and under the tension dial to seat the thread into the tension discs and flex that spring a little. 5. Through the take up lever. 6. Down through the thread guide. 7. Down through the needle bar thread guide. 8. Through the needle.
Thread machine with the presser foot UP so that your thread locates the tension slots while you pull your thread taut through the tension discs.Start at 4. Tweak it by one very short turn left or right to adjust and use scrap of fabric you plan to use. The 4423 has pattern dial setting for wovens and knits, so the tension depends on the type & weight of your fabric. Your width and length of stitches, in addition to the foot attachments will be significant for producing the results you desire. Good quality thread are a must! make sure needle is pushed all the way up in the needle bar groove, flat side in back. A poorly wound bobbin will reak havoc on top!
Try this, totally rethread with the presser foot up, then pull the top thread, it should move smoothly, then lower the presser foot, now pull the thread, it should barely move. This seats the thread in the tension discs.
take thread completely out. rethread, pull your foot lift up before threading. make sure thread is in the tension disk of you dial and notice if thread is a little tougher to pull when u put foot down...
Check your tension disks, with your presser foot up, and the tension dial on zero. Sometimes a piece of cotton breaks off between the tension disks and then prevents the disks to work properly. Also make sure when you thread the machine, the thread does go through the disks and over the take up lever. After you threaded the machine, before putting the thread through the eye of the needle, lower the presser foot and while pulling on the thread with your left hand, increase the tension with your right hand. Do it slowly and you should feel in difference in tension. If this is the case, your machine should work fine. Also use a ball-point needle on t shirt material. Good luck!
all machines thread the same. TTN tension,take up,needle.
Beginning with the spool, guide the
thread through the thread guides to the tension assembly. Pull the thread
through the tension assembly and test it to make sure the tension is working
(To do this test, adjust your tension setting to normal or medium or 5 or
something in the middle. Raise the presser foot and pull the thread through the
tension. It should pull easily!! Lower the presser foot and pull the thread. It
should pull noticeably harder.) If it passes this test, continue up through the
take up lever,then down through the thread guides to the needle. Make sure your
needle is fully inserted and turned the correct way.Your Industrial machine has a long groove on one side of the needle. This long groove must be on the left side of the needle when it is inserted properly. sewman7
Sounds as though you've misthreaded the upper tension. The best way to verify this would be to thread your machine, lower the presser foot on to the material. Now try pulling the thread through the needle. (Assuming your upper tension dial is set to a number greater than one). You should feel resistance. Should you not feel resistance, rethread your upper tension.