I'm not an expert on hydraulics by any means, but here are some observations that I think may be valid.
1) I think the power beyond valves should have another line to "dump" the return flow from the cylinders that needs to connect to the reservoir.
2) Connecting the additional valves between the pump and the power steering connections means that your power steering will go away whenever one of the added valves is actuated. Connecting your valves between the power steering taps and the existing remote will give priority to the steering.
3) Raising the relief beyond the factory setting of 1600# will add stress to the pump and gears that drive the pump. You may get away with it. On the other hand, you may blow pump seals and dump Hy-Tran into the engine, may damage the pump, may blow the gear train that drives the pump. You may want to price a pump and a gear set before you boost the pressure.
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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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