Posted by Mathias NY on September 25, 2008 at 08:35:17 from (12.4.26.248):
In Reply to: Not really . . . posted by jdemaris on September 25, 2008 at 07:22:44:
I guess I should have been clearer...
When I referred to closed center system, I should have added that also means pressure-compensated. We have hydraulic presses where I work and I have done tests with the various pumps. A 10gpm pump pulls more amps when it is at full flow (no load) than when it is full pressure (no load). Since no work is being performed in either situation, the energy is essentially converted to heat. The situation that uses less energy produces less heat.
An open center 10gpm pump is moving (up to) 1.3 pints of fluid per second the entire time the tractor is running. A closed center system moves none unless flow is needed.
My theory on the burnt starter motors is that Deere may have used bigger pumps that their competetors. A bigger pump is no extra power, when not in use. However if the system has leaks or controls are adjusted when the pump is off, the starter will have that much more work to do.
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