Posted by jdemaris on September 26, 2008 at 06:43:22 from (67.142.130.36):
In Reply to: Re: Not really . . . posted by Joe(TX) on September 26, 2008 at 05:43:24:
There is no such thing as a standard "closed center" pump. There are many variations. Any pump can be closed center if there is a way to shut it off when a function is not being used.
Piston pumps in general cannot feed themselves with oil, i.e. no suction. Even hydrostatic pumps use extra charge pumps.
In regard to the pump you are talking about? Kind of hard to comment since you don't give any specifics.
All John Deere closed-center piston pumps require addtional charge pumps to keep them supplied with oil - they cannot draw oil on their own. Same goes for many Massey Ferguson systems.
Again, as to your tractors? I have no idea what you have.
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