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Garden Tractors Discussion Forum

John Deere 300 Valve / Kubota BX2200

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jack in michigan

01-06-2021 13:09:39




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Hello everyone,
I have a BX2200 with the LA211 Loader attachment. I also have the front blade and snow blower which both require a valve similar to the Husco valve that is fixed into the loader. So here is my issue, when I want to remove the loader to use my blower or blade, the valve stays with the loader unless I pull pins that are not normally pulled for removal, and I really donít want to do that anymore, it is a lot easier to leave it all together when removing and re-installing. I would like to find another valve that I can install when using my Blade or snow blower. I have a 2 spool valve off of a John Deere 300 garden tractor which would save me some money if it could work, but since I am not confident in what I am doing, I am not sure if it is big enough to handle the pressure coming from the BX2200 tractor. Has anyone out there had this same issue or have any suggestions for me on what to do?
Thanks, Jack

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wore out

01-07-2021 05:55:07




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 Re: John Deere 300 Valve / Kubota BX2200 in reply to jack in michigan, 01-06-2021 13:09:39  
The John Deere 300 valve comes from a system that flows about 3 gallons per minute, and has a relief pressure setting of 850 to 975 psi.

So you can compare that to the specifications for the BX2200, if you have or can get them.



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jack in michigan

01-07-2021 09:40:12




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 Re: John Deere 300 Valve / Kubota BX2200 in reply to wore out, 01-07-2021 05:55:07  
Hello wore out,
The Kubota dealer said my BX2200 has around 1,850 psi and about 3.5 gpm, so I am not sure whether or not the JD valve could handle the pressure. What could happen if I tried it worst case? I hear a lot about "power beyond" would you have layman's explanation for that? Thanks for you input so far,
Jack



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Brendon-KS

01-07-2021 20:48:28




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 Re: John Deere 300 Valve / Kubota BX2200 in reply to jack in michigan, 01-07-2021 09:40:12  
Power beyond is a fifth port in what would otherwise be a 4-port valve. On a typical open-center control valve you have an inlet, an outlet, and two work ports. When the valve is in neutral oil flows in the inlet and out the outlet. The outlet port discharges both unused oil when in neutral and also return oil from the function. However, if you want to add a second control valve to the circuit you shouldn't just plumb the outlet of the first valve into the inlet on the second valve. In theory you could operate the second valve with the first valve in neutral but most valves have a limit on the acceptable backpressure on the outlet port. These pressure limits are due to the seals and also the function of the relief valve. If the first valve had a port for oil to flow out of when in neutral that wasn't also the tank return for the work ports the problem would go away and that's exactly what the power beyond provides. When the first valve function is being activated the flow out of the power beyond port stops and the flow is diverted through the function and is discharged out of the outlet port. (Most valves will also operate in a proportional state where part of the inlet flow is going to the function and part is going out the power beyond port when the control lever is feathered.) As soon as the valve returns to neutral the outlet port flow stops and it all goes out of the power beyond port again. Every valve in a series stack-up should have a power beyond port except for the last one in the line. (A power beyond valve will work perfectly fine as the last in the line or even by itself but you would need two drain lines plumbed to it, one for the outlet and one for power beyond port, and this would be cluttered and more costly.) Many valves can be converted to operate either way with a simple plug swap.

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