WVshooter said:
I've just always wondered how a two stage pump (think wood splitter) would work on any of the Case/Ingersoll tractors.
It won't.
Here's why.
Suppose you install a 2 stage pump that puts out 10 GPM at 3600 RPM and 0 PSI into your Case. This pump is designed to switch to the 2nd stage just as soon as the pressure exceeds 700 PSI and then it only delivers 4 GPM. OK... everybody clear on that?
So....it's now spring time and you bring out the tractor for the first time with this new pump and take it for a spin. It works great so you decide to mow the lawn. Once again, it works great and you are really happy. It's a nice day in late April and you decide it's time to prepare the veggie garden for planting so out comes the tiller and you hook it up. You drive into the garden, rev up the engine to full throttle, engage the PTO and lower the tiller into the soil. Almost immediately, the tiller slows to just a few RPM and you don't understand what's wrong.
ANSWER: Driving the tractor around and even cutting the grass, did not cause the system pressure to exceed 700 PSI because you mowed in Lo Range and drove slowly. However, the tiller is far more demanding when it comes to pressure and the second the tines hit the dirt, the pressure soared right on by the 700 PSI kick in point for the 2nd stage. Instead of the needed 10 GPM going to the tiller motor, it's only getting 4 GPM and now it's rotating at 40% of what the engineers designed it to spin.
The same thing would happen if you were out mowing grass on level ground and then had to climb a steep grade, your ground speed would slow to a crawl until the system pressure dropped lower than the cut-in point for the 2nd stage.
A pump like that would drive you nuts but don't worry. I doubt that there is even enough room to install one unless you cut a whackin' big hole in your dash tower.