Looking at the manual, 300U and 460U are same, I believe zero pressure with steering at rest is OK as the system is "open center". In other words, with the steering "at rest" all fluid entering is discharged.
If you are building pressure with the steering wheel turning and not getting any fluid to the assist cylinder (check as above), then there's definitely something wrong in the control spool...which looks a little sensitive. The spring plungers which recenter the spool (IOW so the front wheels don't go full lock when you ease the steering wheel one way or the other) look to be a very important part of the assembly.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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