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Hydraulic Cylinder One Way

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TedD

04-19-2005 09:02:38

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I am loseing my "modern" live hydraulics tractor and most go to the belly pump tractor. Is there a way to adapt hydraulic cylinders to operate with one line. I can live with one direction pressure. Thank You.

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Redmud

04-19-2005 17:05:32

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Re: Hydraulic Cylinder One Way in reply to TedD, 04-19-2005 09:02:38

Ted, if you only use one hydraulic hose to the cylinder, then the other cyl port has to be open so the cyl can vent. the vent port NEEDS a filter, or you will suck dirt into the cylinder by way of the vent. been there and done that.

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captaink

04-19-2005 09:30:27

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Re: Hydraulic Cylinder One Way in reply to TedD, 04-19-2005 09:02:38

In a word yes. You need to make or install a vent in the cylinder port you don�t have a hydraulic hose in. I have made vents by taking a regular square head pipe plug and drilling a hole half way through the top of the plug on a flat on the square, and drilling a hole from the inside of the plug towards this hole to form a vent that water and other garbage won�t easily get into.

On the subject though you can rig up a double acting valve spool on your belly pump and get two-way hydraulics. Take the pressure line from the pump and run it to the spool and then run the return from the spool back to the belly pump drain or tee it into the oil fill on top of the torque tube. Then supply your cylinder pressure from the valve spool and wa-la you have double acting hydraulics�

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Complicator

04-19-2005 11:13:34

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Re: Hydraulic Cylinder One Way in reply to captaink, 04-19-2005 09:30:27

To further complicate things, you could always plumb the "dead" line from the cylinder into the fill tube on the belly pump. Fill the "dead" side of the cylinder with oil, so when it goes up it pushes that oil into the belly pump, and when it goes down it sucks the oil back out. That way, the belly pump is always full.

The problem with 1-way hydraulics is that you have to have enough fluid in the reservoir to fill the cylinders, or you won't get the job done. If you've got a 3-quart reservoir, and it takes 4 quarts of oil to fill the cylinders, then you're screwed unless you do as I describe.

2-way hydraulics don't have that problem because there's always oil coming back from the cylinder to take the place of the oil you sent to the cylinder.

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