Question about Sewing Machines
I think it is mechanical because I have tried the cleaning oil and hair blower
Probably a stuck slide block which is common on these machines.
Usually not a difficult repair but the back cover needs to be removed and the mechanism oiled.
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Posted on Jan 02, 2017
There are numerous things that can cause this, some very simple, some less so.
1. Fortunatly, the most common one is also the simplest to cure. When you turn the selector (upper left) knob between stitches, one of the things that is happening when you feel the resistance is that it is lifting the followers off the camstack so that it can move to another stitch. When the camstack is normally doing its job, lifting the feed cam follower is what puts the mechanism in reverse. So, while the selector is between stitches, the machine is temporarily in reverse. Also, the dots where the dial is to be placed to change the camstacks is between stitches, so if the dial is on these dots or anywhere else except snapped into a stitch, you will get nothing but reverse.
2. The buttonhole mechanism is stuck in the reverse portion of the buttonhole. Usually if this is the case, the needle position will also be stuck on the left side, and the width control /buttonhole control will not function correctly. Usually you can correct this yourself and I'll explain how in a bit. It is usually caused by lack of use of the buttonhole mechanism.
3. Either the arm that connects the camstack to the stitch length block or the block itself is stuck. Both these parts are spring loadedto bring them in the forward position, so long periods of rest are a contributing factor.
All of these causes except for the first one are because of the mechanism not being exercised frequently enough. These older Vikings do not like to sit still very longYou should fully exercise all the knobs at every sitting.
Ok, try this fix. And this is to free up the mechanisms that are probaby stuck from non use and old oil and grime buildup. Take your seamformer (cam) out of the back. Find a hairdryer and blow some heat in there for awhile. This will soften up any hard oil or grease that may be causing the mechanisms to stick. Then if you can it would be best to have what is called TRI-FLOW oil (the BEST) and spray or drop quite a bit into there covering the mechanisms and let it soak in. You might try a good sewing machine oil soaking or WD-40 in small amounts. Little by little test your knobs, slowly working whatever is stuck lose. Never force the issue. Small amounts of movement little by little will eventually free it up.
Good luck. Hope this helps. If this does not help you may have to take it to a technician and hopefully you won't find out that your take up slide isn't broken which is a major job.
Posted on Nov 25, 2007
MOdel 6430 has the stitch length and buttonhole selector on the same knob. It is the one on the bottom right side of the machine. I believe you may have selected the buttonhole by pulling out on the large round knob. You need to turn the knob back to 0 zero and push in. This should return the machine to normal mode.Adjust your stitch length to 3 and try it. The reverse knob in the center should also stick out so that it becomes operational again.
Posted on Jun 05, 2008
Take it in to be serviced by authorized Viking repairperson. I understand that for ~ $175 they will disassemble your machine, remove all the hardened grease from gears, calibrate the gears & set tension correctly, etc. A small cost considering these older mechanical sewing machines are GEMS and will provide you another 60 years of sewing bliss if taken care of properly.
Posted on Jan 24, 2010
Your stitch length dial is stuck. Your machine is in need of oil. If you open the back of your machine and see the bit that moves when you turn you stitch length dial. oil that bit and warm it with your hair dryer. It should become loose. It take a bit of warming and working the oil into the machine. You have to repeat this process a few times.
I do have the service manual at email@example.com
Posted on Jan 26, 2010
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