Note that the crown on the nut faces the machine. Remove the slotted nut that rests against the beehive spring. The next picture shows the part of the mechanism that applies pressure (“tension”) to the thread. It doesn’t hurt to take a picture for reference at this point. Laid out on the bench, these are the parts you should see. Remove all of the parts associated with the tension control knob… up to the beehive spring retainer nut. This is one good example of where reassembly is not necessarily the reverse of disassembly. We will make sure all of the parts orientation is correct in reassembly, so we don’t worry about how parts are installed during disassembly. The hole is not round, it is more of an oblong with straight sides. The washer with the tab will only fit two ways on the the post. Remove the plastic numbered insert and this is what you should see… Be prepared for things to start falling out, The tension knob and parts controlling the dial stops are held in place by the screw. Remove the screw in the center of the tension dial. In proper adjustment, the spring will rest with no tension at the point the sewing needle just touches the fabric under the foot. This will separate from the assembly and will need to be reinstalled in essentially the same position. Note that the tension assembly has a backing plate that serves as a travel adjustment for the thread take up spring. Loosening the small set screw shown behind the cover will allow the assembly to be removed from the machine. To remove the assembly, you need to open the front cover on the sewing machine’s nose… It is from a Kenmore model 158.19412 and it is common to many Kenmores. Here is the tension mechanism we are working on. This is the right way to assemble this mechanism, and I will go into some detail… hopefully to the point where I’m not beating a dead horse. The assembly might work even if assembled incorrectly before the beehive spring and tension discs come into play, but it won’t be as smooth as it should be, or correctly calibrated the tension with the dial.
#KENMORE ULTRA STITCH 12 BOBBIN HOW TO#
I have seen many tutorials on how to do this, but I have seen some that assemble it wrong. The topic here is a Kenmore tension assembly, but the process can be generally applied to most any class 15 bobbin Japanese made machine. The tension assembly is one of those parts that seems to be a target for the good intentioned… and often not properly reassembled.
There is no telling if the machine was “worked on” by someone with good intentions who took the assembly apart and didn’t put it back together correctly. How does this happen? There is no way to know the complete history of a vintage sewing machine unless it has been in your family since it was new. The problem I run across frequently is the improper assembly of the top tension mechanism. Part of any sewing machine reconditioning involves the complete disassembly, cleaning, and reassembly of the upper tension mechanism.
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