I recently installed a Ford Model 711 Loader on my 1955 Ford 950. After contacting the hydraulics and checking the fluid levels, I was quite pleased when I was able to raise and lower the loader a couple of times. But after that, nothing......I checked the fluid level, and it was a little low, so I topped it off. Still nothing, no leaks, but no hydraulics, and that includes the 3-point. I assumed air was trapped somewhere in the system, and proceeded to bleed the pump, but found no pressure at the pump. At this point I assume the pump is bad, unless someone else has another suggestion or observation. Also, how do you tell if this is vane or piston type pump. 1955 Ford. Thanks