I have a 460 Diesel and have had some issues with the hydraulics but could always figure it out, until now. I have had many things apart and have replaced the hydraulic pump, not the power steering pump, and worked on the pressure relief safety valve which I actually just removed, and inspected these parts again yesterday and I don't think this is where my problem(s) are, everything seems to be as it should. I did however have a previous and solved issue with the orifice screen, was crushed and filled with crud, as This Tractor was parked for a while before I got it(not real long). I have changed the filter and fluid a few times and I have used the tractor with hydraulics for a while but it has really never worked to its complete potential and now I have what I think is a common connected issue that is affecting multiple things.
The major problems are, No Power Steering(P/S) and my lift wont go up unless it is unloaded, even if I stand on it it wont go up. When it is totally empty it will go up but it goes very slow and kind of hiccups or pulses on the way up, and I have to increase the idle to about 1200rpms to even get it to go up at all. One thing that strikes me as odd is if I put the lift all the way down or up and the pump goes to low pressure, I can get the Gage to go to 1400psi by moving the middle control lever(for the remote lines) with nothing connected to the remote lines. But, if I move the lift lever to the full up position so the pump normally would go to a full pressure mode, While its trying to go up I have no pressure on the Gage and if I move the remote lever then, I can't get that 1400psi anymore, like everything is in a bypass mode and wont go to a pressure mode like it should.
I have had hydraulics with everything just the way it is so I don't believe anything is out of adjustment. I have previously had the pressure, safety valve apart before and understand its purpose for the most part and I just removed it and expected the screen to be crushed and full of gunk but all looks to be ok. I am Just stumped.
I am thankful for any and all help. I will email people if they would rather go that route, or I will call them if they can help.
Thanks, TOD

Just a shot in the dark, but is the Tele-depth control linkage connected? It should run from the (sitting in the operators seat) leftmost valve assembly to the fast hitch hydraulic cylinder. Depends if it is the cable style, or linkage style. The cable may be defective, or the linkage binding/bent/stuck. To my understanding, the power steering pump is piggy backed on the hydraulic pump (it is on mine), which you replaced? Was there a smaller pump there at all?

I had ordered the manuals for mine,(hydraulics system, engine, etc.) when I got mine. The $ spent on the literature will save you headaches and $ in the long run. At least it seems to help me. Best of luck! I am sure someone on here knows what is troubling your tractor.

Thanks for the reply Redroundhead. Well, I will double check the linkage to the tele-depth spool valve but I don't believe that is my problem.
As for the P/S pump, I had mentioned that I replaced my hydraulic pump but did NOT replace the power steering pump. I am going to do a pressure test on the p/s line tomorrow and see if I can figure out if I can developed pressure by placing a gage and a shut off valve, when I close the valve I should get pressure on the gage and I don't doubt that it will produce pressure.
Will post after the p/s test. Please any further ideas don't wait for me, post ur comments/ideas.
Thanks guys.

The link below might give you some insight into the hydraulics.
Could the lift cylinder be leaking internally?

Pete
60 series hydraulics

If your hitch linkage is adjusted correctly the system will not go on high pressure when lever is full raise or lower. If you are getting 1400 psi by activating aux valve lever that sounds good for pump and relief valve, sooo I am thinking your fluid is by passing right at the hitch cylinder or the check valve of the hitch cylinder. You can easily check either or both. Just unhook hoses from check valve and hook directly into block check valve is bolted to and plug block outlets. To check cyl just unhook hose that is return while lifting. With some kind of a load on hitch, and hitch not moving no oil should come out.

Pete 23, are u calling the check valve is that thing under the seat inside bottom of the tool box??? If so, lets assume there is an issue with it, is it an issue that I can just disassemble, clean And reassemble? Man I really hope you are right. I never gave that a thought, I thought that was only for the remotes.
I will let you know,
Tod

That is a good article.

The Tel-a-depth spool valve "floats"?self-centers when not called upon. So if it is bining, or stuck, it will cause problems. Basically, when you move the lever on the teledpth quadrant, it tells the spool valve to flow oil, in a certain direction, and the linkage tells the spool valve when to stop flow. So if the linkage is out of adjustment/compromised, it will affect the "normal" operation of the fast hitch.

Yes, it can be taken apart, and depending on if it is early or late model, may have two balls and piston or one ball and piston, couple o-rings.

Pete 23, you guessed it. It was at least primarily the check valve. When I disassembled it, the o-ring that is "supposed" to be on the shuttle or that piston in there was missing/GONE. That's right, completely gone. No sign of an o-ring at all. I didn't have the exact o-ring for it but I had one close enough to run it and see if it corrected my problem and it was a happy time in the shop. I hooked up to my tiller and checked the lift cylinder before I dove into the check valve and it passed the test. So, I was still hooked up to the tiller from doing the cylinder test and when I reinstalled the check valve, with my test o-ring, I could lift my tiller with not much more than a low idle. A very happy time.
I STILL HAVE A POWER STEERING ISSUE. I haven't done a pressure test on it yet. It has always worked very well until this issue arrived. I will be running some tests this weekend and post the results. BUT, in the mean time, if anyone has any thoughts or suggestions for either some tests to run or what to look for as a possible problem, please post your thoughts.
Again, thank to everyone SO FAR, for the help you have offered. A special thank you to Pete23 for his suggestion that was my specific problem. I have the proper o-rings coming for what I need and as soon as I get them in the mail, I will install them. Thanks again guys, its awesome to get it right, I appreciate it very much.
Tod, Michigan.

Now you may find a piece of your missing 0-ring plugging something up in your PS system.

Thank you IH fan, I have been hoping to find that o-ring
somewhere in my searching although I expect it is lodged in
the cylinder housing or at best it got spit back into the
reservoir and lays harmlessly on the bottom. A Guy can
Hope right?
Anyway, I will be doing a flow and pressure test on the PS
system this weekend and will post the results as soon as I
have more to post. Between watching the grandkids and
trying to give my Tractor some attention, somehow the
grandkids always win out. Any more thoughts, please let me
know.
Thanks again guys,
Tod.

If power steering worked ok before you took pumps out, I would suspect the o-ring or gasket between the two pumps. That thin little o-ring is often not included with pump packages and also the thin gasket can be a problem. Some try to sell you the thick one tht goes over the end when you have no power steering pump. And that o-ring from check valve can't get into power steering unless you had no filter as it is a seperate circuit from main pump. You can take the return line off from power steering, put it in a bucket and it should flow 3.5 gals per min of clear fluid, not foamy .

Power Steering(PS) is out and I did the pressure test and only produced 100psi. I get the feeling that there is no flow. I did This pressure test back when I was determining if I needed a hydraulic pump(HP). When I knew I need the HP, I wanted to check the PSP as well. When I did the test before, as I closed the valve to test for pressure, I could hear and feel that there was some flow and pressure going on behind the valve and felt like if I closed that valve something was gonna blow. But this time I could close the valve and didn't sense the presence of flow and pressure.
I just did this test and I'm gonna open the manual and stare at the ceiling tonight's trying to figure out what to do from here but my main question is should I do anything more before I drain the fluid and inspect the pump(s)?
If I don't get any response I may re-post with new topic. This topic was about hydraulic issue(s) and everyone was nice enough to help with my PS as well.
Thank you for all the help and suggestions,
Tod.

I'm going to start a new post about my power steering issue. I hope everyone will look for it, it will be labeled topic heading, 460 POWER STEERING issue. Please look for it. I'm going to post it right after This post.
Thanks for all the help, especially Pete23.
Tod.