3400 power steering id and leak

murphq

New User
Hi, I'm new here and to the great world of tractors! I recently bought a 1970 3400 off of my neighbor. It's in pretty good shape but has 2 issues, this leak and charging system.

1. Power Steering id - I've looked up the schematics for the 3400 on the NH site and it does not match what my tractor has. Any idea what model this power steering column is off of? The power steering works
fine.

2. In the pictures - It is leaking fluid from in between the hydraulic valve assembly and the large housing below it. More specifically below the piece where the hydraulic lines attach(and has that metal tag),
and the top of the piece that is mostly red in the pic and has the id#AEGG50 on it. I'm guessing I lose a shot glass worth of fluid an hour and this pic was taken after an hour of brush hoggin. How dire is
this issue? Fix immediately? Previous owner used it for 4 years like this but that doesn't make it right!

If my attached pics don't show this will make zero sense. Thanks in advance for your help.
a240633.jpg

a240634.jpg

a240637.jpg
 
above the valve assembly is a seal that commonly fails. Below the valve assembly I'm not sure if there is a seal, O ring, or gasket.

I'd put it on my to do list and tear it down and fix it (realizing of course that I'm about 2yrs out on that list so I'd need to keep topping off the reservoir).
 
I didn't look up the model # on the tag.
But that is not a typical 3400 PS column.
I would say it's been switched out with one from a newer model. 3910?
Someone here should be able to ID it for you.
In any case, I would suspect it's a seal. Probably not unlike the older ones it will have a seal both above and below that hydraulic block. Take it apart and replace them. Any good bearing house should be able to match them up.
I've never worked on one that new but wouldn't hesitate to open it up for a look see.
 

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