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Husqvarna Viking 6440 buttonholer, reverse frozen

My Viking 6440 will straight stitch, but the buttonholer, reverse, stitch adjustment are frozen. The cam will turn and is not cracked at the assembly, but it is stiff & hard to rotate. The local Viking dealer wants $379 to service this. Does anyone know where I can buy a service manual for this machine? I've had it since it was new in 1976, over half my life, and I don't want to part with it, but can't afford that expensive of a service. My husband can fix anything if he has a manual or someone to answer questions (like what type of lubricant to use).

Thank you!

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Re: Husqvarna Viking 6440 buttonholer, reverse frozen

A seller on e-bay who redoes Viking machines says the the grease they put in them (the older vikings) becomes too stiff and the knobs stop turning. He cleans them out and then he adds some kind of teflon lubricant. Probably can find him on e-bay still. He is informative.

Posted on May 21, 2008

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Put on the C foot. Select the buttonhole stitch. The machine will start sewing in the bottom left corner of the the buttonhole. Sew the length that you need, press and release the reverse button and sew the right side of the buttonhole. When you get back to the bottom, press and release the reverse button again and the buttonhole will be finished and the thread will tie off and the machine will stop. If the buttonhole is what you want, press and release the Stop button and the machine will repeat this buttonhole as many times as you need until the machine is turned off or the Stop is pressed again. When repeating, you need not press the reverse. Just press down on the foot control and continue until the machine stops by itself.
If you don't like the first one, just sew another one using the reverse button to set the ends.

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Viking Husqvarna model 6440 gets stuck in reverse

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.
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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.

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