I have a 30+ yr old Viking 6440 sewing machine and have lost one of the cams. Please help me locate a source for the "E" cam that creates the little hearts. I still have the other five and everything is working great.
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You can remove the rear cover by taking out two screws on the back cover and a screw at the lower rear corner on the side. With this cover removed you can see most of the internal levers and mechanism and be able to access some (not all) components.
Was the inner zig zag gear replaced? To check this, look in the hole where the cams go. You should see the black plastic gear with 3 slots all the way around where the your cams lock on to. Look at the gear closely. You should NOT see any crack or splits in the plactic gear. If you do, then this why your go on properly.
I'm trying to find a machine similar to yours and have done much research re: the older mech viking sewing machines 6000 series. They are GREAT machines, suffering only from problems such as yours caused by the old "lube/grease" they used when it was made @ factory. In their efforts of making a "never needs oil" mech sewing machine, the grease tends to harden & freeze up the gears & cams inside the machine. You need to have it serviced @ authorized Viking shop as you have to completely disassemble the machines & gears, clean, re-lube, & re calibrate the gears... I understand this s/b ~ $175. Money well spent considering if taken care of your beauty could be sewing for another 60 yrs!
Hope this helps!
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.