Posted by Mathias NY on October 30, 2007 at 09:55:44 from (12.4.26.248):
In Reply to: live hydraulics posted by Jim W. on October 30, 2007 at 08:54:31:
Live simply means that they work any time the engine is running.
Open-center vs closed-center is another question you may come across soon. I don't know which system your tractor has. Open-center means that the hydraulic pump will always pump the same amount of volume (gpm) regardless of how much demand there is. Closed-center is (in my impression) a better design. This setup only pumps as much oil as the system needs to maintain pressure. So if you are not using any hydraulics, the system will not be moving any oil, this saves on horsepower, fuel, and reduces puts less heat into the hydraulic oil. Sadly most manufacturors have gotten away from this type of system. As far as operating equipment with remotes, most people won't notice a difference between the two types of pumps.
There are generic hydraulic fluids out there, however they are not all the same grade of fluid. I would look up what Deere calls for on your 4020, probably their Hy-Gard brand fluid. Once you know the specs for the fluid you could cross reference it to a generic type.
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