Eugene,
I don't know if that model was sold as an Allis Chalmers or a Simplicity, but if it was, and you can cross it to either brand, manuals may be available for free download from the Simplicity web site. (I believe the 1030 was also sold as an Allis Deutz 5220.)
For reference, the following Hinomoto manuals are available as Allis-Chalmers operator and parts manuals on the Simplicity site. I believe all were sold under the Simplicity and Allis Duetz names also.
Allis Chalmers 5015 Simplicity P/N 2097355
Allis Chalmers 5020 Simplicity P/N 2097313
Allis Chalmers 5030 Simplicity P/N 2097242
Good luck,
Knute