The spool is the item that the lever moves internally to direct the flow of oil to the desired location.
If you were to pull the spool out it is a round rod that has grooves cut in it to allow oil passage. It looks like an old thread spool you may have seen on your mother's sewing machine. Thus this is how it got the name spool valve. If I find a picture I'll post it.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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