Posted by jdemaris on September 25, 2008 at 09:17:59 from (67.142.130.32):
In Reply to: Re: Not really . . . posted by Mathias NY on September 25, 2008 at 08:35:17:
Most tractors with closed center systems have to use two pumps instead of one. Closed center pumps cannot feed themselves with oil and thusly require gear pumps to feed them. Deere usually feeds the front piston pumps with gear driven, 7 GPM open center pumps.
With Deere and the burnt starters - no theories are needed. It's a proven fact with what causes burnt starters and hard cranking. Internal closed-center leaks which just about always exist in tractors. I've been working on them since they were first introduced by Deere and we had plenty of problems with them, even when brand new.
In regard to electrically driven gear pumps hooked to conventional pressure relief valves (like most open center tractors use). If you hook power to a pump for a half hour with free flow, zero pressure, and then hook for half an hour with blocked flow and the relief valve cracking - MUCH more amperage is used with the system blocked. If you doubt it - go hook a very large, or shunt-wired amp-meter to a Western or Meyers snowplow pump and try it.
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