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Ford Tractors Discussion Forum
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Re: 3400 Ford Power Steering Question

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Sean in PA

01-11-2013 06:34:42
71.224.102.32



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It should go up and down very very slightly. So slightly that it should almost be unnoticeable. The up and down movement is what actuates the control valve that directs the hydraulic fluid to the cylinders for the hydraulic assist, but if it is moving up and down to where it is noticeable to you, then the upper thrust bearing is likely worn to the point that the whole shaft is moving up and down, including the control valve housing, so the control valve is not working as it should.

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Craig Kruse

01-11-2013 07:14:16
71.53.228.57



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 Re: 3400 Ford Power Steering Question in reply to Sean in PA, 01-11-2013 06:34:42  
Quoting Removed, click Modern View to see

Well, Darn..... wish I had noticed this when I was fixing the leaky shaft seal. I have about a half inch of up and down so it looks like I have to tear the tractor all apart again. This thing is about to beat me down. Been working it since last february and still can't get the bugs worked out. Thanks for the info.



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Ultradog MN

01-11-2013 14:50:39
184.100.109.75



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 Re: 3400 Ford Power Steering Question in reply to Craig Kruse, 01-11-2013 07:14:16  
The upper and lower thrust bearing almost never go bad on a PS unit as they are constantly bathed in oil.
I'll bet you dollars to doughnuts that you either forgot or improperly swedged the upper nut
to the shaft and it loosened on you.



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Craig Kruse

01-11-2013 20:39:18
71.53.228.57



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 Re: 3400 Ford Power Steering Question in reply to Ultradog MN, 01-11-2013 14:50:39  
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Well I just repaired the leak with a quicky sleeve and didn't tear into the valve body or the housing but I guess I'll find out if the nut is loose when I get in there to see what's going on. I just hate that I have to tear it all apart again after having spent 11 months fixing leaks, finding salvage parts and rebuilding parts and trying to get the thing in a usable condition. I enjoyed the challenge at first cause I like working on mechanical things but I've had as much fun as I can enjoy on this project. If I didn't have twice as much invested as buying a new one I would sell it but I'm in to deep to back out now. Thanks for letting me know where to look for the problem.

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Ultradog MN

01-12-2013 03:15:57
184.100.109.75



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 Re: 3400 Ford Power Steering Question in reply to Craig Kruse, 01-11-2013 20:39:18  
Yeah, the worst part about it is pulling the tin off again.
If it were me and I was that far into it I would go ahead and pull the hydraulic block out of it and go through it. Take it apart and clean the rust and crud out of it. I like to wash fine parts like that in lacquer thinner then lightly grease and reassemble. Replace the lower seal while you are in there and both of the Orings - part #s 14 and 33 in the photo below.
Make sure you clearly mark the lines to the cylinders at they can be a pia to sort out if you don't. I use tape and mark them top and bottom.
Be careful not to drop the little springs and plungers in the hyd block as you pull it off the column. They will want to fall out the bottom.
I&T FO-31 manual has a pretty good description of adjusting the spring washer and swedging the nut.
If you get into trouble reinstalling the plungers, etc in the right holes just holler.
We can help.

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