Buffalo Forge Co is now called Howden North America and ther is an office in Williamsville,NY. The machine tool division was sold in the 90's and I believe the company now handling that is called Buffalo Machine Tool in Lockport, NY. I know they handle drill presses and iron workers, but I don't know if they still handle the forge you have -but they might at least have a manual.
If they cant help you, you can try calling 716-817-6919. He doesn't handle these forges now, but he was service manager for many years (still works there) and he knows a lot about most products that we sell or have sold. Good luck,