First, &quot;congrats&quot; on your recent purchase!  If you have the book 
 OLIVER HART-PARR  by C.H. Wendel you will notice in the back that serial #'s only go to 1948, although several machines would have been sold after this to use up existing inventory. Production would have changed in 1949 to the &quot;new&quot; #33 self propelled combine.
 The 22-36 machine was sized to the model 70 olliver tractor. As for a manual, I have one extra but perhaps you will find a better one. There is NOT a lot of information in them. Another manual was supplied covering the Hart feeder and elevator/weigher with much more information regarding the adjustments in the feeder.
 Hope your machine is in good condition, I have one as well (1942)
If I can be of any more help drop a line, have a good day.
                                                                        Murray