Help me figure this out

[blehmann]

New to me used tractor. In order to change the air filters, the aftermarket end loader has to be removed. Doing this last week, as soon as the three hoses connected to the loader mounted joystick were removed, the hydraulic pump loaded up and sounded exactly like I was operating an SCV valve lever with no implement connected to the rear remote. This tells me that the relief valve is located in the joystick. While I don't understand much about it yet, I have determined that the joystick is a power beyond model. I'm concerned that using the tractor even for the couple of minutes that it takes to back it away from the end loader and then driving back into the end loader will damage the hydraulic pump. An aftermarket block was added to the hydraulic system to obtain the additional ports needed to power the end loader hydraulics. The manner that it was done puts the return quick connector in a position that makes it just about impossible for me to connect one of the pressure hoses to the return quick connector. I can't even test the idea if I can't get the hose connected. I have no idea who manufactured the block, so I can't research how it is ported in order to figure out a solution.

I am assuming that the two smaller hoses coming out of the front of the block are the pressure hoses and the larger side mounted hose is the return.

 

[ptsg]

So, that block on the picture provides Pressure, Power Beyond and Tank to the loader valve.

Looks like the loader valve comes out with the loader. This means you'll have to connect the Pressure hose to the Power Beyond hose so it completes the circuit again in order to use the tractor without the loader and being able to use the 3 pt and remotes.

Also, the relief valve is most likely located on that hydraulic block, hence why you haven't grenaded the pump yet.

 

[aczlan]

Post a picture of the valve showing the markings, usually there will be a port marked P, one marked PB and one marked T.
The hoses on the tractor that go to the P and PB ports should be connected whenever the loader valve is disconnected.

Aaron Z

 

[blehmann]

The port on the left with the hollow set screw next to it is marked T. Going around the corner the next block is marked PB. I will have to confirm it, but I'm assuming there is a P hidden by the hose fitting coming out of the blue painted block above the aluminum block that was added. Any idea of who might have made the block? I would like to download a schematic and instructions. If there is a relief valve that I can loosen, I will. I only need to move the tractor in and out of the loader on rare occasions to perform maintenance. I'm not sure that I can connect the PB and P hoses without buying fittings to build an adapter. I'll look the next time that I'm near the tractor. Thanks for the replies. I appreciate it.

 

[ptsg]

When you pulled the loader out, didn't you have some quick disconnects?

No need to touch on any relief valves. All it needs it the Pressure and Power beyond lines to be connected to each other.

Alternatively, there are some tractors where you turn a spool for when the loader is on and turn it the other way for when the loader is off the tractor. This could be the case, but can't quite tell from the picture. It will essentially do the same thing as connecting both hoses together but does it internally in the block.

 

[blehmann]

When you pulled the loader out, didn't you have some quick disconnects?

No need to touch on any relief valves. All it needs it the Pressure and Power beyond lines to be connected to each other.

Alternatively, there are some tractors where you turn a spool for when the loader is on and turn it the other way for when the loader is off the tractor. This could be the case, but can't quite tell from the picture. It will essentially do the same thing as connecting both hoses together but does it internally in the block.

Three disconnects. No instructions...as is almost always the case with used equipment. Now that I know which two to connect together, it is just a matter of locating them and checking if they will connect together. I just assumed that I could disconnect all three hoses and back on out. It was a surprise to hear that pump straining. Thanks

 

[blehmann]

I think that I've located the installation instructions for the adapter kit. HV5902 sure looks like the one, even though it doesn't mention fitting tractors as new as mine. I'll keep digging. I'd like to find a paper that shows the fluid routing in that block. It would help me to understand things.

 

[WranglerX]

And there is this...

HV5902 installation guide on my Ford 4100

I'm redoing all the plumbing on my tractor and loader. The hoses are old and cracked, and I also want to change up the loader valve and rear remotes. This is my tractor, late 70's Ford 4100. It has the internal hydraulic pump. Some tractors have an engine mounted pump or earlier Ford's had a...

www.tractorbynet.com

 

[blehmann]

View attachment 814789


And there is this...

HV5902 installation guide on my Ford 4100

I'm redoing all the plumbing on my tractor and loader. The hoses are old and cracked, and I also want to change up the loader valve and rear remotes. This is my tractor, late 70's Ford 4100. It has the internal hydraulic pump. Some tractors have an engine mounted pump or earlier Ford's had a...

www.tractorbynet.com

Yes, thank you. I blew up the picture yesterday and determined the markings on the block. Within an hour, I located the thread that you have linked to. Even though the HV5902 isn't listed as working on the Ford 3930 tractor, I do believe that is what was installed. You gentlemen have been quite helpful. Thanks once again.