Blinding the hydraulic pump

No matter how many ways I turn the pictures over, I still come up with the pump being blinded on the intake side to prevent further lifting action. Now blinding a pump is bad because it leads to cavitation of the fluid, with all sorts of evils happening as a result. So why is the N's piston pump blinded, and why doesn't it hurt itself as a result?

I can speculate that it's got to do with the short strokes, slow speeds and such. But I honestly do not know this as a matter of fact. Any input would be graciously appreciated on this.

It's not the best practice in modern thinking to starve the suction side of a pump. A gerotor or vane pump would be quickly damaged if you were to do this. However, being as how this is a relatively slow-moving, piston pump, which runs entirely immersed in oil, it doesn't seem to come to any harm.

Don't assume that because you can choke the intake and nothing bad happens, that you can run the pump against a closed valve. That would not be good for it at all - continually forcing pressurized oil out through the relief valve or past the pistons. Pump would wear fast!

llater,

llamas

In reading the Pripps books on the N-Series, that is one of things attributed to Harry Ferguson, himself. The Ford engineers, like you, thought it a bad design. That was one of the things changed in the 8N's when Henry Ford II terminated the"handshake agreement" with Fersuson.

However, the 8N Operators Manual shows the hydraulic system in two diagrams, one for draft and one for position control. Yet the diagrams show an intake control valve, as well as an exhaust control valve. Did Pripps get the story slightly wrong?

Don't have a 9N/2N Operators Manual to check the hydraulic system diagram.

fwiw
Larry