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 - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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