Faunsdale, AL | Grhog - 5/22/2018 07:21
Is there an issue with running an open system hydraulics on another that is designed for closed system? Just wondering.
Yes
In general, running a hydraulic function that requires the SCV be open all the time like the downpressure on a JD no-til drill on an open center system will result in overheating the oil. The open center pump puts out the same flow all the time which circulates at low pressure through the system getting cooled and filtered. When you pull a lever the valve blocks the flow to divert it to the function. The worst kind of function needs pressure all the time but doesn't use much oil so the excess goes through the system bypass at usually a higher pressure than normal. So the oil gets hot.
A hydraulic motor may cause a similar problem if it requires only a small volume of oil, shunting the greater part of the pump flow through the system bypass. A solution to that problem may be an adjustable flow divider. It can send the required flow through the motor and allow the rest to recirculate at a lower backpressure than if it had to go through the system bypass valve at full system pressure. Not all tractors have flow dividers though. I would say they are pretty rare except for self contained machines like seed tenders conveyors etc where flow control is required.
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40 series Deere hydraulics
