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).
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.
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at the cam gear. This is the unit that the cam connects to. It could
have a crack or be split completely. If there is a crack the cam stack
will have to be replaced. The parts are hard to get and a good
technician is needed.
As to your question about leather, the 6460 has a special stitch for sewing leather. Select Colormatic cam C and install in the cam hole at the back of the machine. To remove/add a cam turn the upper left hand dial on the front of the machine to the small dot. This disengages the cam. Gently remove the cam by pulling straight out from the back of the machine. Install cam C straight in, ever so slightly twisting it back and forth into the hole to find the sweet spot. You'll hear a click when it's all the way in.
To use Viking's leather stitch, turn the upper left dial to the color yellow. (Note: The slash line on the upper left dial is a stop. You can't turn past that point. Go in the other direction to get to the icon or color you want.) Turn the upper right and bottom right dial to yellow also. The upper left dial is what selects the particular stitch on the cam, the leather stitch in this case. The upper right dial selects stitch length, and the lower right dial selects stitch width. You can move the right dials within the color range. Experiment on a scrap of cloth to get the stitch size the way you want it. The leather stitch looks like a straight stitch with a block style edging to the right of the straight stitch. This is supposed to give a stronger stitch to the leather rather than a straight stitch by itself. If you don't have the manual for your machine: Select which of the eight cams you want to use. All the cams are removed/installed by turning the upper left dial on machine front to the small dot. At the rear of the machine, pull/insert cam straight in or out and twist slightly as you push in or remove to find the sweet spot. Move the dial away from the small dot to lock the cam in. Turn upper left dial to stitch type you want and match the other dials to that same color. Upper right controls stitch length, lower right controls width. Bobbin tension is controlled by the dial at front left of the machine, above the needle. Cams A-C are the workhorse cams and the rest are embroidery stitches.Straight stitch, button and stitched zig-zag will work on any cam. These stitches do not rely on matching a color code. To use those three: To select straight stitch, on the upper left dial, choose the icon that looks like a buttonhole with a zig that trails off to the right. Select stitch length on upper right dial and turn the lower right dial to zero, going by number rather than color. To select stitched zig zag, turn upper left dial to the broken zig zag icon (to the right of the straight stitch icon). Select stitch length and width. To move the needle to the side for buttonhole stitching or other times when you want the needle off center, turn the upper left dial to the button icon. If stitching a button hole, set stitch length to zero and lower right dial to desired stitch width. Push in the small white button that's beneath the lower right dial in order to prevent the feed dogs from moving the fabric forward. Pushing that button in is also handy for putting cloth under the foot before sewing as it prevents snagging and is used for tacking.
look at the cam gear. This is the unit that the cam connects to. It could have a crack or be split completely. If there is a crack the cam stack will have to be replaced. The parts are hard to get and a good technician is needed.
Use the "C" foot. Set the "Stitch Width" dial to 0, then pull it out. You will now be able to rotate the knob and, if it is working properly, you will get the 4 parts of the buttonhole. Rotate to 1 and sew the left column, 2 for a bar tack, 3 for the right column coming down the other side and 4 should close it off. The knob may be rotated back around to start another buttonhole by rotating forward. When it is pulled out, it will not stop turning at 4. Always set the know to 0 to pull it out or push in.