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| When running planter fan (white) on 3rd remote continuous and I lift the planter with #1 remote it makes the hoses going to planter jump. Created a leak at the motor. Even make hoses jump when #3 is in float for roading etc. is there a problem? I don't lose fan pressure just the hoses jump and I suspect it may be causing the fan motor to leak/seep slightly.
Any ideas would be great.
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Lawton MI | I was told that the #1 SCV is the priority valve and motors should hook up there. Use other valves for lift and fold functions. |
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Lincoln, North Dakota | Use #1 scv for running your motors. That has priority. Does list that in the OP manual. |
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Southern Indiana | I agree with the #1 remote for the motor. Dial back the flow to the motor as much as possible and still have enough fan speed. You are maxing out the flow on your main hyd. pump. The older tractors do not have the flow or gpm like the newer ones. You may also get into a problem with your hyd oil heating up. |
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east central ND | When I ran fans on my 4440 I had to return the oil from the fans to the filter housing or it would cavitate like you say. The rear pump can't pump the oil fast enough to supply the main pump. At that time they recommended running the fans on #3 remote. |
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ecmn | If it's like my white planter you need to slow the SCV down almost all the way. Then open the little metering valve at the blower to get to your desired air pressure. With your SCV at full flow you're sending all your oil through the bypass and cooling on the blower |
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Nc Ks. | I was told to run hydraulic motors on #1 valve. Then dumped return oil into side of scv instead of running it through where the hose plugs in. |
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south texas | If switching to #1 and setting flow like others said doesn't help, put a pressure gauge in system and see whats going on. If pressure isnt steady or low may need to check the stroke control valve in front pump. 2200 psi i think. The valve gets worn and can make pump put out poor performance. Had a 4840 and 4960 do this. |
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Faunsdale, AL | Where are you returning the oil from the motor? Should be into the SCV coupler or the side of the SCV through a dedicated return coupler. This is the return not the motor case drain. if it has one of those 3rd hoses it should dump directly into the rear end somehow.
Have you changed your filters lately? Additionally the transmission sump strainer may be clogged.
Finally it may help to turn down the flow rate on the SCV..... EVEN THOUGH you are using a separate valve in the line to adjust the flow rate. Not sure why that may help but it does on mine. I turn the flow up only enough to get the flowrate I need and then everything else works faster.
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Se wisc. | Is there an issue with running an open system hydraulics on another that is designed for closed system? Just wondering. |
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| dmax2001 - 5/21/2018 23:01
I was told that the #1 SCV is the priority valve and motors should hook up there. Use other valves for lift and fold functions.
sitting in seat, which is number one left or right |
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Wallis, TX | I don’t think there is any priority on the back scv on a 40 series. If there is one I’ve never seen it. The only priority is the one on the right side for steering and brakes.
As to your op, what size motor does the planter have? Where do you have your return? Do you have s case drain? If so is it dumping a lot of oil back to the trans case?
The reason I ask is the system relies on “used” oil returning to the scv. If it gets dumped into the trans the trans pump can’t make up enough oil to keep the front pump charged and you get surging. The same thing happens if you have a leak somewhere else in your hydraulic system. Most likely this would be in your 3 point/rockshaft area.
Another thing, is the surging fast like a vibration? If so you could have a bad check valve in the pump.
Edited by twraska 5/22/2018 08:28
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NE ND | There is also a mesh screen in one if the two valves in the main pump. Can't remember which it is but JD parts page would show you. When I rebuilt my pump this winter that screen was nearly plugged. |
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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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Faunsdale, AL | Left is #1
Right is #2
Above #2 is #3 if it has 3
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| thanks |
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40 series Deere hydraulics
