SpringValley

There should be three lines.  Oil in, oil out and vacuum.  Without looking I can tell you that the whole EGR system does not work unless you have replaced the vacuum lines.  The Chinese rubber lines are normally split by the time the tractor is delivered to the dealer.  The vacuum line will run from the pump up to the actuator.  The actuator is controlled by an ECM that is normally mounted very near the actuator.  Basically when the engine gets up to operating temp then it tells the EGR system to start working.  You don't need it.  Mine has not worked in two years. 

Your options are fix it which I would say is find out why it is not getting lubed. Or do away with it.  Depending on your exact setup you may be able to plug the oil lines and just take the pump off.   Don't know for sure as I can't see that far. 

Dang , I have not logged in here in a
while and the first thing I see pisses me off the the max. I used
to live in ABQ and I know what the country is like around there.
The clean water act used to apply to wetlands only. These sound
like a whole new set of regulations.

This sounds like the Obama/Eric
Holder/ATF “gun walker” program where they let large numbers of
firearms “walk” into the wrong hands deliberately so they can complain
about the violence and push for more gun regulations. But when their
own ATF agents get shot with those same guns they blame the head of
the ATF and he resigns in disgrace. But who do they get to replace
him???? Obama's buddy from Chicago. I feel safe now. 

Ok back on subject:

Some years ago I helped a farmer build
a pond to water crops. We did this by building a dam in a
creek that would fill. The regulations said that we could not
“permanently” alter the flow or route of the creek we were not.
We looked at getting a dredge and fill permit but determined that one
was not needed because the regulations said that it was needed when
we were changing the elevation of the bottom of the area in question
which we were not. We built the pond. Once it was full the water
flowed on as it always had.

A few months later here came a low IQ
oxygen parasite from the EPA saying that we had violated all kinds of
things and sounded like we had killed his first born child. He was
targeting me as I am the one who actually did the work. Most of
these morons make up part of the rules. They quote laws but leave
out words like “permanently” when referring to altering the flow
of a creek. He said we could not alter it at all. That's not what
the law said. He said we were dredging and filling even though the
law said we were not as we did not alter the bottom elevation of the
stream.

These people are told that they can't
be held personally liable for doing their duty. But when they start
making up their own regulations they are no longer doing their duty
nor do they represent any regulations set forth by the agency they
work for. I told the guy that he could plan on ligation. He told
me that his agency has done well in court against people like me. I
told him that I was not talking about his agency. Since he was
quoting rules and regulations that were outside of his agency that my
law suit would be against him personally for harassment and
misrepresentation. I am the type of person that people will take
seriously and they should. The guy left and I never heard another
word about it. But I did know enough about the regulations at that
time to be able to call bull shit when I needed to.

Power steering was optional on the 520.  Most people just put ATF in them.  Some people used power steering fluid. It's just a standard add on pump and cylinder setup.  There was nothing special that I remember about them.