Certainly there are multiple schools of thought on this subject, difficult to establish any single position as absolutely correct. As Moss Road states, I had a 2400B, operated mine as he did his. With my Kubota, HST. I operate at PTO speed only when using the implement, requiring that level of output. Often my 3 point finish mower in a light application, cuts just as well if I reduce speed. I do NOT monitor hydraulic fluid temps but my engine temp gauge reflects the speed decrease and my fuel economy increases substantially. If using the loader, the valve is jerky and over reactive at PTO speeds. The medium range still proves adequate ground speed for loader work to become productive at reduced engine speed.. There was a cat fight over appropriate road speed for HST, when traveling with the FEL, in another forum. Hope this conversation does not degrade to that point.