huh, I've never had a problem finding online manuals. Usually $20 ish dollars which I feel is fare for someone to go and find the manual and digitize it.

I usually have better luck searching for parts manuals or shop manuals which is what you really want anyways.

I basically buy the manual before I'll buy anything, other than the family daily driver which is the only machine i own that I don't work on.

I know I have a couple case shop manuals and I own a couple old case machines, never had an issue pulling manuals and wiring diagrams for them.