I bought this pump a couple of years ago and was told he thought it came from a Wheel Horse. It has a different control handle than that of a IH pump and the plumbing looks to be makeshift.
It isn't the best pic but it has the same body/reservoir and valve body as the IH pump. The pulley is slightly smaller and cast.

It isn't the best pic but it has the same body/reservoir and valve body as the IH pump. The pulley is slightly smaller and cast.