4000 Ford power steering problem

I have a 69 4000 ford that has developed a issue with the power steering. It is pressurizing the reservoir and forcing fluid out the vent hole in the cap. I havent been able to find much info about this type of problem on the net so I'm asking here if anyone can help. This has the square pump on the engine with the reservoir mounted above it.
Thanks in advance.
 
Have you tried changing the filter? If they get really clogged they can cause the fluid to foam and expand which forces the fluid out the top.
 
I'll second what Sean said.
There is a nut on top of the reservoir. Remove that and the cover to replace the filter.
I just replaced one about a week ago. Very simple.
Photo shows the box with the part # if you want to get one from the dealer. Mine had it in stock.

cvphoto50880.jpg
 

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