Well Ill take a run at it. First off, you are probably missing some parts for the backhoe to work. I will explain more about that in a bit. Lets start with the easy stuff. The pipe you label as "A" is a hydraulic outlet. It is I believe designed to feed a single acting cylinder on a dump trailer. I say this as it originates from the valve block with the knob located in front of the seat. It sees the same pressure as the 3point hitch cylinder sees. That valve knob serves two purposes. 1. It controls the speed that a 3PH impliment is lowered. The more you turn it clockwise(screw it in) the slower the impliment lowers. 2. If you screw it all the way in, the 3PH will not go up or down and all the pressure/flow that would normally lift the 3PH will go to the fitting on the end of pipe "A" when you lift the 3PH raise lever. set this way, you could raise and lower a dump trailer with the 3PH lift/lower lever. In your last picture, the small rubber hose with banjo fittings on each end is a low pressure fuel line. The small diameter metal pipes are high pressure fuel lines that run from the injector pump to the injectors. OK, that is about it for the easy stuff, on to the more difficult.
In your very first picture, you show the FEL hydraulic schematic. At the bottom of the page, right above the label for pump 10, is a squared off "U" bracket that has 3 of the lines running upward from it labeled as "9 tractor fluid tank". Everything starts and ends at that resovoir. The middle line with the circle with triangle is the pump. From the pump, the line runs to the Quick Connect(QC) fittings. As you are currently connected, the line from the pump is running to "tractor hydraulic system 8" which is the 3PH and from there back to the resovoir, which is the case that surrounds the 3PH lift cylinder. In your picture of the loader control valve, I believe you are correct when you say P1 is at the bottom. I believe "P" is the fitting on the very top and "T" is the one comming out the side of the assembly with the letter "T" by it. In order to connect this FEL, you will need to do the following.
1. Separate the QC comming from the pump.
2. Select a half of a new QC fitting(from one of the 2 sets shown in your last picture) that will mate with the end on the line from the pump. connect this to a line that will reach to the "P" port on top of the control valve.
3. With the other half of the new QC pair used in step 3 attach it to a line that will reach from the "P1" port on the bottom of the control valve down to the QC half under the right floorboard.
Unfortunatly, the last step I am not exactly sure about as I don't see the required attach point in any of your pictures. The port labeled "T" needs to run unrestricted back to the resovoir(just like in the diagram). Port "T" is where the fluid goes when you overload the hydraulics in the loader and the safety relief valve in the loader opens(trying to lift too much or bottoming/fully extending the cylinders). Port "T" is the relief fluid path back to the resovoir. In your pics, I don't see where that is possible, but I am sure it is. One of the large hoses in your last picture has a banjo fitting on it and what looks like a bracket on the other threaded end. That could possibly be for a return line to the resovoir.
I mentioned that you may not have all you need to hook up the backhoe. what I should have said is you probably have what you need to hook it up, but the specs on the DF354 that I have read, show it to have a 33.6 Liter/min or 8.8 gallon/min hydraulic flow rate at 2400 RPM. That is a little low for a backhoe and you might not be real impressed with it's speed(it will still have the same power though). Most hoes have their own resovoir and pump that attaches to the PTO to provide a higher flow rate for greater digging speed as a lot of hydraulic operations are required for each bucket of dirt.
Jay, I just realized looking at your profile that you are not far from me. How far out of Victoria are you? I am right across the straight in Port Angeles. I would be willing to come help you sort it out if you could meet me at the ferry. If interested, you can contact me at
r_marlett@msn.com.
