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Thanks for all the comments so far. I will try and get over there tomorrow and get some pictures/video to add some clarity to this thread.

Ideally SMs, but both would be nice!

1967 ford 4000 (or is that 4500?) industrial tractor with 753 backhoe. Had several issues but finally up and going and working “mostly” well… but then I have a problem with the swing. It swings very aggressively when i operate the swing lever but it is also very “spongy”… when I let go of the...

As the subject line says, trying to figure out what i have… So 4=4000 50 = industrial 1=diesel 1=no pto F = power shifting. So does this mean I have a ford 4000? Or do I have a 4500?

All of the places selling manuals. Is this copyrighted materials with a portion going to the original writers…? Or is this just a bunch of people that have collected and scanned them over time and are just selling them? Reason I ask is that if these are copyrighted materials I guess I will buy...

Awesome!!! I was wanting to add a gauge to my system (don’t understand why they aren’t on there as standard) and was trying to figure out where to put it, and this is the perfect spot for it. Thanks for all your help with this!!!

I am trying to find some info/cut sheet/maintenance data on a Double A pressure relief valve. You would think with the power of the internet, and manufacturer and part number this would be a pretty easy ask… but alas I have searched and can find no data…. I am trying to 1- confirm that it...

Sorry, in my eagerness to get something posted I did a really poor job in posing the question/facts clearly. I will clear this up now. This is (from the best I can tell) a 1967 ford 4000 series industrial tractor with a 735 (or is it 753) back hoe and front end loader. Again, from the best I...

So I replaced the blown hose on the back hoe, and as I expected I have basically moved the leak from the blown hose, to other parts of the circuit… I have 2 other leaks now, one I have identified the solution, but the other one is at this hose/tube connection. What type of hose/tube is this...

So I finally managed to move the tractor back to my place, and start taking it apart to replace the blown hoses. It certainly seems like whatever that part was it was linked to the auto dig function. It is on the bucket cylinder. As I was taking all of the hoses off to get at the blown one, the...

Thanks for the response, and please excuse my ignorance. I just assumed that there were o-rings sealing the spool positions, I didn’t realize that it was just really tight tolerances matching…. Makes for a whole lot simpler/reliable system though!!! It does make me a little more confused...

Let me start by saying thanks to everyone that commented so far. You absolutely nailed it. Looks like it was for the “auto dig” feature. Odd that it was only on the boom control. I guess at some point it got removed from the bucket controls. The tractor is currently at the sellers location. I am...

So I really could do with some help on this, if anyone has any idea what it is…. I am trying to move this old backhoe and I had some luck today. One of my hoses is blown, and I thought it was the one for the dipper cylinder, but turns out it is the one for the bucket cylinder. So now I have the...

Ok, so it looks like I am taking off two hoses to get at the one that needs to be replaced. While I am in there, as horrible as this job is going to be, I intended on looking at all of the hoses and replacing as many as look suspect. So I know what I am doing on the valve manifold end. I have...

Great idea!!! Thanks for the tip. A lot cheaper than a bunch of pipe caps. Any suggestion about the female valve ports?

Anyone know the thread used on the ford 4500 industrial tractor? Would be nice to take a handful of pipe plugs/caps, so I can seal the system up while I get new hoses made.

So this might be a silly question, but I have never done it before so looking for any help/suggestions. I have a blown hose, and need to get it off. See attached picture of the valve block. The hoses are so close together, that I won’t be able to get a wrench on. Is the procedure to remove...

I should have put it in there originally, sorry for the miss. This is a 753 backhoe on a ford 4500 industrial tractor.

So on my backhoe controls is have 6 levers, that operate 6 valves. I would expect the same mechanical connection between each lever and valve but on the boom connection it is completely different. Can anyone explain what this is, and what it’s purpose is? Thanks in advance.

I called the loader a 450 because this is the tag on it. Is that not the correct designation for the loader?

Ok, I won’t get out there till later this week, but I will start getting a hydraulic schematic together. I have been trying to find one for the original equipment, but it is somewhat problematic. The 4500 was an industrial tractor on its own, and it seems the 753 hoe and 450 loader were options...

Steel line coming from the pump - I physically traced the line back and it connects to the outlet of the pump on the pressure side. Black hose - the backhoe is a removable attachement. As such on “standard” equipment the back hoe would have a pressure connection, and a tank connection, so if...

Based on the first pictures, the outlet of the pump connects to what I think is a pressure relief valve via the stainless steel tube you see coming in in the bottom left of the picture. I assume what is going on in that valve is the pressure from the pump passes straight through that valve, and...

I will be honest with you, when the bucket started lifting, and I heard the fluid moving when I released the valve, and did that a couple of times, YES, I did think it was going to be easy…. I should have known better. To your point one. The shafts are a little pitted/corroded, but nowhere near...

I just bought the hoe, and it has sat for an unknown number of years so I have a number of problems… the good thing is the engine fires right up and appears to run ok. It is a four speed with power reversing and it SEEMS like it will pull in both directions. When the gear shifter is in neutral...

Sorry, just re-read oldnslo’s post. If I understand correctly all the valves are in series, not parallel, so once one valve is actuated all of the flow is redirected there. So I can only operate one valve at a time then right?

Thanks for all your replies so far. It make sense, but it drives me to this next question. If I assume my tractor is open center valves, it all makes sense, that fluid is circulating through the pump, through the valves, back to the tank, then start the cycle again. The bit I don’t understand...

Forgive me for asking a stupid question, or if it has been asked and answered before please point me at the thread. I am trying to understand how my hydraulic pump works…. I am on an old Ford 4500 industrial backhoe. The hydraulic pump is mounted at the front of the tractor, connected to the...

Sorry, forgot to add photo for the post above. See attached. Connections on this valve are Inlet on the left, is high pressure directly from the hydraulic pump. Outlet on the right, delivers high pressure to the valve that is the subject of this post. Outlet on the bottom is drain to tank...

Let me know if I can provide any more information.

First post! I just bought an OLD Ford 4500 Backhoe/loader and the valve packs for the loader and backhoe are different to any others I have seen. They seem to have an additional isolation valve. Was wondering if this is common, and what is the purpose. Pics attached so you can see what I am...