leshby, that Briggs engine was made on 15 August 1989. If it is the original engine fitted to that machine, your Greenfield was probably made late in 1989 or early in 1990.
I have never seen or heard a report of, a Greenfield tractor workshop manual. For some models the owner manual contains a wealth of maintenance information, and for other models it does not. The illustrated parts lists (there is one for your model in the manuals section) only show parts and part numbers, with diagrams giving some idea of how they go together.
Your putting-it-back-to-original project would probably be aided considerably by the illustrated parts list, but if anyone has an actual workshop manual I'd be very interested to hear about it (or even better, see the manual).
I hope you have thought very carefully about the idea of fitting a dozer blade to a machine with a single-speed transmission, that can go at less than maximum road speed only by slipping its drive clutch. It sounds like a very bad idea.
