Ferguson a-j0-20 manure spreader

I just acquired one of these spreaders and am looking for any sort of information I can get on it. I plan on getting it working and would love to see a manual on it if there ever was one. I looked in the manual section but did not see anything. As far as I can tell the only actual "problem" on it is a broken chain link on the chain driving the cleats in the bed. Any information on a part number and where I might get these links would be very helpful. Also if there are any features that might help me date it, I would love to know what to look for. From my research so far on the history of the Ferguson stuff, I am pretty certain it would be very close to 1950 since the name plate is Ferguson I think that narrows it down.

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