3910 help needed!

[Southernspeed]

I bought another tractor yesterday, a '79/'80 Ford 3910. I've got a much older tractor and a much newer one but not had anything from this era. It has a Woods DuAl FEL on it that the previous owner put on, pretty sure it wasn't on it from the first owner, a building company. It has two hoses coming from an aluminum block under the seat and another going to the rear axle housing. I presumed that was feed and PB to/from the block and return to sump via rear axle. But to lift the 3 point I have to curl the bucket to get power to the 3pt. Is this how they are or is there a better way to plumb it? I'll attach some photos, see what you think. Thanks!

 

[Harry in Ky]

No, that's not how it's meant to work. I can't tell from the limited photos, but suspect the two lines (assuming the hose with the couplers is the pressure/supply to the loader valve) on the other side of the valve may be reversed. Assuming (again) there is a power beyond sleeve in one of those ports.

 

[Southernspeed]

No, that's not how it's meant to work. I can't tell from the limited photos, but suspect the two lines (assuming the hose with the couplers is the pressure/supply to the loader valve) on the other side of the valve may be reversed. Assuming (again) there is a power beyond sleeve in one of those ports.

Yes, sorry for the poor photos. The two lines from the aluminum block go to the front and rear ports on the valve block. That large nut style 90* on left side of the plate in the photo (with the other 4 loader hoses with regular 90* ends) goes to the rear axles housing. I did wonder if there was a PB plug in there, or if there was even provision for it. Unfortunately, to get the cover/mounting plate off, I have to disconnect all lines. I'll be taking the loader off in the next day or two as I need to sort out injection pump leaks, power steering leaks etc so I'll look closer at it then.

 

[Harry in Ky]

As I see it the pressure line should be in the lower right portion of the photo. If the line with the 90 degree fitting goes to sump, the one under the frame support SHOULD be the power beyond line and should have the proper sleeve installed. You should be able to see that without removing any covers. It will look something like this.

Power Beyond Adapter Sleeve for Z100 Series Summit Monoblock Valves

Power Beyond Adapter Sleeve for Z100 Series Summit Monoblock Valves

summit-hydraulics.com

 

[Southernspeed]

As I see it the pressure line should be in the lower right portion of the photo. If the line with the 90 degree fitting goes to sump, the one under the frame support SHOULD be the power beyond line and should have the proper sleeve installed. You should be able to see that without removing any covers. It will look something like this.

Power Beyond Adapter Sleeve for Z100 Series Summit Monoblock Valves

Power Beyond Adapter Sleeve for Z100 Series Summit Monoblock Valves

summit-hydraulics.com

Looking at my one, I presume it doesn't have provision for PB? Or do you mean it should be on the right face (in this photo) hiddedn by the mounting plate to the right?

 

[Southernspeed]

Looking at the diagrams on the Summit website, looks like PB adapter would screw into the port on the front facing side of the block(sitting on tractor view), then that hose would screw into the adapter? (yes I haven't had much to do with hydraulics before!)
Do all blocks accept a PB adapter? Thinking maybe I should just buy a new one from Summit. I'm guessing this block is pretty old.

 

[Harry in Ky]

What you should do is remove the return line and the fitting it attaches to. Look inside the exposed port and see if it has a machined bore for the nose of a power beyond sleeve, or if it actually has sleeve in it now. As for replacing the entire valve, yes, that's an option, but then you need to know a little about the process, how to identify what style hoses, fittings, the existing ports on this valve, ETC and what you need/want to change if required. I would start with what you have now and see if you can get it working correctly with minimal effort.

 

[Southernspeed]

What you should do is remove the return line and the fitting it attaches to. Look inside the exposed port and see if it has a machined bore for the nose of a power beyond sleeve, or if it actually has sleeve in it now. As for replacing the entire valve, yes, that's an option, but then you need to know a little about the process, how to identify what style hoses, fittings, the existing ports on this valve, ETC and what you need/want to change if required. I would start with what you have now and see if you can get it working correctly with minimal effort.

Thank you! I'll try to get a look at it soon. Getting busy around here!

 

[Tinhack]

That knurled brass knob just peeking out from behind the hose in your first picture is the flow valve. It should turn about 90 degrees front to back. It adjusts the amount of flow, fast or slow, for the 3PT lift arms and thus the shared flow to your accessory block.

It's supposed to be about a 2" plastic knob but they get broken easily. I made a lever for mine and stamped F and S on it. I don't have a loader but I do have three rear remotes. Make sure your rear remote valve is centered (off). I forget which way is fast (forward or backward) but it should be hard to figure out if your knob still moves.

 

[Southernspeed]

Well, I don't know why that double posted. Sorry.

Funny, I was actually looking at a photo of your tractor in another post from 2025 and noticed the triple rear set up. Do you remember where you got that valve block or the make? Great looking tractor!!

 

[Tinhack]

Funny, I was actually looking at a photo of your tractor in another post from 2025 and noticed the triple rear set up. Do you remember where you got that valve block or the make? Great looking tractor!!

I got it off Amazon but it was shipped from the Netherlands. I think they have their own website now as well--Spare Parts Holland. I remember it only taking a little over a week to get here.