Yes, you either need one-way spool valves, or you need to plumb the second work port from the valve back into the reservoir.
If you just leave the second port capped off you will be deadheading the system when lowering the loader. That will cause the oil to flow through the relief valve. Lowering will be slow and the oil will quickly get hot.
Use separate spool valves for each function and eliminate the splitter valve. Plumb the 3pt up with down 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.
... [Read Article]
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