Deere 2520 & CMI Dump Trailer
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kennyd
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Only one PB sleeve is needed per valve, and it does not go in the OUT port-but rather the PB port.
The OUT port is connected no matter what, without the PB plug it feeds the next valve in series (the 3PH in your case). With the PB plug it just dump waste out from the cylinders to the tank, and the PB port now feeds the next valve in the series.
That cylinder would work but I think a 4x24 would be better for the dump trailer.
J_J
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Seems like that is what I said about the pressure on the tank outlet, and you disagreed.
Are you contradicting yourself about the pressure on the tank outlet port on the valve, as in post # 4. I have called the engineers at Prince, and also talked to several hyd technicians, and they all say the same thing. A lot of the valves I have looked at, give the max presure on the outlet port of the valve, and it is usually around 300 to 700 psi.
Although I understand that one can hook up all kinds of things, and they can work, but is not the accepted way to use the outlet port for down stream work. I know you have done it and it works for you, and may last forever. The only reference that I know of, is that the outlet port/tank port should go to tank, with little to no back pressure.
http://www.hydraulic-supply.com/pdf/328.pdf
kennyd
Advertiser
Like I said before...where are all the threads about blown up valves on 3PH logsplitters and backhoes that are plumbed without PB? Find me one-just one please.
I will not debate you on this.
I am kind of slow with this topic, but slowly I get there. By using the calculator I notice that the 3" bore at 2500 PSI produces ~ 17k lbs of push force. Don't know if this trailer will ever dump more that 3,000 lbs. The 4" bore cylinder at 2500 PSI is significantly more.
kennyd
Advertiser
Baum Hydraulics has calculators to figure the push/pull at a angle if you are curious.
The 4x24" tie rod cylinders can usually be found for less money because they are so popular (used on logsplitters).
So, if using the PB port, wouldn't it feed the 3PH given the Deere PB does not go back to the tank? Since the next valve is the 3PH, isn't it what the PB port connects to? If not, what is the purpose of the OUT port if I cannot go directly to the tank?
J_J
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All the tank ports need to go to tank.
kennyd
Advertiser
IF you are using a PB equipped valve, then the PB port is indeed connected to the 3PH, and the OUT line connects to the tank as it carries the "waste" oil form the work ports.
IF you are NOT using a PB equipped valve, the PB port is NOT used-only the IN and OUT ports are used. This is the way me and others have done.
I am not sure how I can explain it better?
Here are three examples:
Mine
Jim's
Brad's
No worries, it is clear. 
Thanks for taking the time to explain. I've looked at the other posts, and indeed the use of the PB port on a control valve has been unused. Ironically, the text on the Deere PB port states that it only requires an open center valve to use. Interestingly enough, my log splitter valve did develop a leak at one point. Don't know if that is related to any of this or not.
I would seem that if one were to employ the PB port in the Eaton valve that there would be on line going IN another to the tank via OUT and another to the 3PH via the PB port. OR just forgo the PB port all together.
I hope to have this all together this weekend. :thumbsup:
Thanks for taking the time to explain. I've looked at the other posts, and indeed the use of the PB port on a control valve has been unused. Ironically, the text on the Deere PB port states that it only requires an open center valve to use. Interestingly enough, my log splitter valve did develop a leak at one point. Don't know if that is related to any of this or not.
I would seem that if one were to employ the PB port in the Eaton valve that there would be on line going IN another to the tank via OUT and another to the 3PH via the PB port. OR just forgo the PB port all together.
I hope to have this all together this weekend. :thumbsup:
