Anyone know about Whites Till-R-Plow?

We were given a wonderful Whites Til-R-Plow for our garden. I have not been able to find anything about it online. It is an older tiller and I really need to know how to maintain it and finding a users guide of sorts would be very helpful. I know the basics... oil, filter, etc... but things like belt size and the other attachments and adjustments, well, I need help. Anyone? Please?