Can't find tank return line

[brianrohr13]

That line is input to the 3pt. I believe it internally dumps to tank after the 3 pt. I have no experience on your loader valve, so unless you got a work shop manual or better pics of the valve, I got no idea on tank.

Got it.

 

[ericm979]

The 3pt valve dumps to the tank unless it's engaged to raise the 3pt. That's how my Branson's BH is plumbed in. One hose comes from the loader through two sets of remote valves, into a loop with a set of quick connects and then into the back of the transmission case where the 3pt valve and cylinders are.

You can add your valve in that loop but the valve you add should have no PB (just a plug in that port) and it's tank port must be rated for full system pressure. Many valves do not have that latter feature but there are a lot that do. When you lift something with the 3pt, all the valves in the system see that pressure on their in and PB (or tank if they don't have PB) ports.
You may have to find the manufacturer's spec sheet for the valve you want to see what its tank port can handle as many retailers don't provide that info.

 

[aczlan]

The 3pt valve dumps to the tank unless it's engaged to raise the 3pt. That's how my Branson's BH is plumbed in. One hose comes from the loader through two sets of remote valves, into a loop with a set of quick connects and then into the back of the transmission case where the 3pt valve and cylinders are.

You can add your valve in that loop but the valve you add should have no PB (just a plug in that port) and it's tank port must be rated for full system pressure. Many valves do not have that latter feature but there are a lot that do. When you lift something with the 3pt, all the valves in the system see that pressure on their in and PB (or tank if they don't have PB) ports.
You may have to find the manufacturer's spec sheet for the valve you want to see what its tank port can handle as many retailers don't provide that info.

Exactly.

Aaron Z

 

[Michael In Tennessee]

Exactly.

Aaron Z

I'm not sure. Valves after the valve that is working should not see full pressure.

 

[brianrohr13]

That line is input to the 3pt. I believe it internally dumps to tank after the 3 pt. I have no experience on your loader valve, so unless you got a work shop manual or better pics of the valve, I got no idea on tank.

The is about all I can find for pics. A couple drawings from Kubota website of what I believe is the right valve. The spot that was curious to me in the drawing was the O ring. Wouldn't need O ring just to bolt on a valve to the side of the case. In thinking maybe that's the passage for the fluid to tank? One of the drawing shows where the pressure relief is. As for my pictures. I got a view of under the seat, a side view, and a shot from up underneath.

 

[Michael In Tennessee]

I just looked at the parts diagram @ messick. There is one o-ring on the back side of the valve. That is likely the tank port. Not sure what to do. Some folks have plumbed tank to the fill port.

 

[aczlan]

I'm not sure. Valves after the valve that is working should not see full pressure.

In a power beyond system using valves that have tank ports you are correct.
In the case of this backhoe (which does not have a tank port), if the backhoe is upstream of the rear remotes and one of the remotes is stuck on, the hydraulic fluid leaving the backhoe control valve will have to get to a high enough pressure to either move the load on the rear remote (if something is connected), open the pressure relief for the rear remote valve, or open the pressure relief for the loader valve which is upstream of the backhoe valve.
There is no other way for the fluid to get to the tank.

I just looked at the parts diagram @ messick. There is one o-ring on the back side of the valve. That is likely the tank port. Not sure what to do. Some folks have plumbed tank to the fill port.

If there is an oring under the head of the bolt that is sealing off the port on the valve, there's a good chance that that is intended to be a o ring fitting (ORB).
If you take it out and take it into a competent hydraulic shop they should be able to get you a matching fitting (Tractor Supply or a similar such store in your area may also have the fittings, but it's up to you to make sure that they fit properly).

Aaron Z

 

[brianrohr13]

If there is an oring under the head of the bolt that is sealing off the port on the valve, there's a good chance that that is intended to be a o ring fitting (ORB).
If you take it out and take it into a competent hydraulic shop they should be able to get you a matching fitting (Tractor Supply or a similar such store in your area may also have the fittings, but it's up to you to make sure that they fit properly).

Aaron Z

Check out this picture. This is the o ring (#020) we're talking about. it looks to be between the valve and the tractor (transmission case maybe). But anyways, i think what it means is the there is a hole in the back of the valve (where the o ring is) and it dumps direct into the tank. there's no place to put a fitting there and tie in.

 

[brianrohr13]

I may get to the point of thinking outside the box. Like the fill tube or maybe a drain plug.

 

[aczlan]

Re: Can't find tank return line L4240

Good point, I was looking at the valve backwards.
About the only option I see would be to cut line 110 in this diagram and put in a compression tee:


Aaron Z