Aux. Hydraulics

[yotehunter66]

How do these compact tractors hydraulics work if they only have two ports? One is the supply and the other the return. Don't most hydraulic valves need a supply a return and a tank line?

 

[Sysop]

I'm not seeing where you have a real question. The bit that resembles a question, you have answered yourself... Two ports on the rear, one is supply, other is return.

Only thing I could add is; which is supply and which is return, depends on which way you move the lever.

 

[yotehunter66]

I was thinking that for a open center system to work, without a pb, port that one of the lines had to return to the tank. Can that return line feed another open center valve? If not how do these add on aux kits for a lot of the compact tractors work?

 

[Sysop]

The valve itself should be plumbed to the tractor with a supply and return, these are unrelated to the two ports on the back and there is always fluid flowing from supply to return whether you activate the two ports on the rear or not. The two ports on the back are activated by the lever on the valve. Move the lever one direction, flow wants to go out one of the rear ports and come back in through the other. Move the lever the other direction, the flow on the two rear ports reverses.

 

[Sysop]

On another note, there are some implements with only one quick disconnect line, and just an open return. Those you plug into the port of your choice, plumb the open return to your tank, and activate the flow on the used port with the lever.

 

[ovrszd]

I was thinking that for a open center system to work, without a pb, port that one of the lines had to return to the tank. Can that return line feed another open center valve? If not how do these add on aux kits for a lot of the compact tractors work?

So your question is in regards to the ports on the valve, not the quick couplers at the rear of the tractor??

 

[yotehunter66]

A little of both. In the case of my Yanmar ex3200 the add on hydraulics for the rear replaces or interrupts the return line from the loader valve. That's why you have to have the jumper hose plugged in for the three point to work. I have a back hoe I'm mounting to my tractor it has a supply and return. If I plug those into the rear remotes than the return line from the back hoe would feed the three point.

 

[ovrszd]

So the tractor supplies the loader, then "Power Beyonds (PB)" to the rear hydraulic remotes, then PB to the 3pt? So if you plug the backhoe into the rear remotes you are expecting it to PB the 3pt?

Sorry if I'm messing this all up.

Pictures would be awesome!!!

 

[yotehunter66]

Nope you got it in a nut shell. That's how the rear remotes are plumped. That's kind of what I'm missing. Alot of implements like a log splitter for a three point only have two lines. I assumed that an open center valve would feed the other three point unless you move the valve to activate the splitter that would make the three point inoperable until you move the valve back to center.

 

[ch1ch2]

How do these compact tractors hydraulics work if they only have two ports? One is the supply and the other the return. Don't most hydraulic valves need a supply a return and a tank line?

The premise of your question is an issue.
Valves have to have 3 ports, most have 4 ports and some have 5 ports.
3 ports; supply, return to tank and 1 work port.
4 ports; supply, return to tank, and 2 work ports.
5 ports; supply, return to tank, and PB. The valve which will be supplied by the PB will have its own return to tank, and its own work ports.