I love the old Japanese machines. The ones with the cam stacks are hardest to make work though. I recommend some Tri-flow and time out. Go easy on turning the knobs. There maybe a set screw. If you turn it and the internals are still stuck the knob will break loose and can be tough to fix. For cleaning external I use oxi clean laced with Dawn but not on the older machines. You can use a car wax that does not have cleaner. Here is a link for more Japanese machines that do the fancy stitches:
http://www.quiltingboard.com/vintage...s-t207880.html
I do not know of a generic manual for the machines with camstacks.