Vane Pump vs Piston Pump

Later,Terry

Vane pump was the original on a Jubilee. I have one, in good working order still on my NAA. I believe the piston pump is a replacement to the vane. The output of the vane pump was adjustable 1.25 to 4.8 gallons per minute, by turning the Hy-Trol knob on the pump. I run mine mostly at the lowest setting. The piston pumps have a fixed flow rate at 2.5 gallons per minute. I think there is also a 4.0-gallon per minute piston pump. This is too much flow though the NAA Hydraulics and causes over correction in draft control. Though Ford or NH doesn't service the Vane pump, parts are available. Check the archives.

I was a plant maintenance man before I went into field service. I have rebuilt vane pumps and thought they were easy to clean up and install new vanes. I seem to recall a kind of fiber composite vane that did not eat pumps but did wear and need replacement regualarly.

Not sure if this applies to the Ford vane pump, just hoping Zane or someone that knows can explain the problem. I have always wondered.
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