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So I have been getting a louder whine to my power steering/hydraulic pump. I know looking at the pump itself it is definitely leaking. After looking around at the pump I found the tag on the bottom of the pump and its a Vickers V20 pump. I will post some photos of the label. 
So I have been looking at this system and it seems that the filter is old, and it still says Vickers on it. 

The filter is Vickers #V0211B1R03, which I crossed over to and have ordered a Wix 51756. 

My plan is to pull the pump off, take it apart, inspect it and if the hard parts are in good shape I will put new seals in it. I will attach the Vickers pump info sheet I found when trying to identify the pump and its seals. 

The seal kit I ordered is for the V20 or V20F pump, it is part #CWH V20SK. 

So I have done quite a bit of searching and I have found that most are using synthetic ATF for the power steering/hydraulic system. r 

My question is, does anyone have an approximate capacity of the system? 
I would like to go ahead and get some fluid here to change the fluid. It seems this system has been neglected. 

I think I am also going to follow Richards lead and change the overhung unit to grease at some point, I can see its weeping some.