still having power steering issues

I don't know the system at all, but if you get 1200psi at any point, the pump is not the problem. JMO

my guess is the relief valve is sticking open, replace and refill with hydraulic oil per mfg. spec.

Ok, so I went out in the shop and tried some things.    Started the tractor up and cracked the pressure line going into the steering control valve, and I had fluid coming out so I tightened it back up.   Craced  the rear line coming out of the steering control valve which goes to the front of the ram and fluid was pouring out of it, without even trying to move the steering wheel.     The other line I couldn't crack right by the steering control valve so I cracked it open at the back of the ram.   The only time fluid would come out of it, was when I moved the steering wheel.   

Good tip Russ.   I just went out and turned the steering wheel each way and referenced the back of the bellhousing to the u-joint directly behind it.   When i turn to the left, it moves in, and when I turn to the right it moves out.   When I took the whole steering box apart, it seemed the shaft was rusted into the coupler on the end of the shaft coming out of the steering control valve.   So when I put it back together I put some grease in there so that it wouldn't be all bound up in the future, if I had to remove it again.

What manual do you have for the 19? The A-C or AGCO manual goes into the operation of the control valve way more than the I&T. I can scan and send you pages of the A-C manual if it would help.

How much of the control valve did you disassemble? Russ is correct that the steering shaft does need to be free to move slightly fore and aft to shift the spool in the valve.

Travis, thanks for the info.   I have an IT manual and it doesn't explain it nearly that well.   When I tore the steering valve apart, maybe I tightened that nut too much and the steering valve isn't centering itself and that's why the oil is going to the front of the ram all the time.   Looks like I will have to pull the steering valve out again and see what I did wrong.   Thanks for the help. 

Bob, I think the nut is tightened down too much.   I will pull it apart tomorrow morning.   I think I'll go out and drain the fluid tonite ahead of time.    Compressed air is a great idea.   I will try that before I put it back in. 

Chuck, When I redid out D-19 power steering it would not react very fast with the nut on the steering valve adjusted per the book. Someone here advised me that I might need to loosen that nut another flat or two and that fixed it. If you back it off too far the steering will get very figity.

Edited by Butch(OH) - 28 Jan 2012 at 11:26pm

Ok, got it tore apart and this is what I found.   Using air pressure, air was only coming out of the back passage the way it was, which is the same as when I had it hooked up.   Took it apart and backed the nut off a few turns and when I push the shaft forward, air will come out the front hole, with a fair amount of pressure.   When I pull it rearward, air will come out the back hole, but not as much pressure as the front hole.   But if I let go of the shaft, it wil stay wherever I left it and not return to neutral.   This leads me to believe that the spring that is between the two plungers is shot and not strong enough because if it was, I would think with the air pressure still on it, the shaft should return to neutral, correct??   Or am I thinking about this wrong?  

Looked the spring up on the AGCO parts site, is this spring still available?

Dave, I understand what you mean about the worm gearing pulling it in and out depending on which way you are turning it, but I thought that the spring should have some amount of pressure on the plungers to keep things centered.   I wonder if the plungers are worn as well as the spring.   Does anyone have one of these in pieces that could do some measuring of things.   I hate to just loosen the nut, put it all back together and then find out that it still isn't right.   I'd rather it sit stuck in the place it is and make sure all is good before I go through the effort of reassembly. 

If you could, that would be great.   I will measure what I got.  

Edited by ChuckLuedtkeSEWI - 29 Jan 2012 at 4:16pm

No, that's perfect.  Looks like all is good and I can reassemble.   I will put it together with the same amount of play that you had in yours and give her a try.   Thanks so much Travis.  

Success!!  Thanks to all that replied back and thanks Travis for the pictures, the measurements, and the manual pics.   The AC manual does describe it much better.  After reading it a couple times, you can understand that at sitting position, fluid is going into both lines, and once it starts turning it will flow into one side, and flow out of the other.   I put everything back together and followed the measurement that Travis gave me as a guide for starters.   Started putting everything back together and got into a rythem so I didn't want to stop until I had it back on wheels and running so I could test yet tonite.   Put all of it together and refilled with universal hy/trans and started it up.   Like Macks says, the only time it will hit 1200 is when it is at the end of the stroke which it did, but this time you could feel the power steering helping you along when turning the wheel.   It is not as effortless as says my D15 or D17, but this one was also standing still in the garage and it has really big float tires on it right now, like 9.5x 16 or even bigger.   That won't be what's on it when I'm done.   I have a smaller set of 5.5 x 15 rims for pulling that are 6 bolt pattern so after I get those on, the footprint on the front will be much less then now.  I'm sure once I pull it out of the shop and give her a spin, it will be noticably different.   I do think that I messed up and had the adjusting nut too tight.   I think now it is much better, could go a hair looser on it, but I don't want it to be too fidgetty and I don't think I want to tear it all down again to make another minor adjustment.   I think things weren't working before due to all the gunk that I found in the system everywhere including underneath the relief valve so it was a good thing that I cleaned everything up.

Travis you are a good man, going the extra for Chuck and tearing your control apart to take pics and measurements.