550 Power Steering overflowing

I have never seen this brought up, but maybe I've missed it. I have a '69 550 with power steering. Not the generator/pump setup, but the later separate pump. When it's cold, it will push fluid out of the dipstick/breather cap all over the hood. Anyone ever deal with this and have a solution to it? It is not as bad when it is warmer out, far worse in the winter.

It will eventually push quite a bit of fluid out and the tank will get close to empty.
 
Well, I guess it could be. It sounds a little similar but mine does it when running and is far worse when its cold. Guess that could lead to a check valve?
 
Maybe something sticking when it's cold. It wouldn't hurt to try a bottle of Lucas additive. That stuff usually works pretty good.
 
Ive put the Lucas additive in and tried to use it a couple times and its maybe worse than it was. Its getting to the point it can hardly be used. Is there a check valve or something that controls the flow of fluid back to the reservoir? It sure seems like the flow back is so excessive that it is pushing through the cap and out the breather. It not only makes a mess and you get to wear the fluid, it basically drained the tank today.

Any other thoughts anyone has?
 

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