You can add an open center two spool valve by feeding the output of none port to the input of the valve, then plumb the outlet port of the valve back to the other port of the power-trol valve. Then block or tie the power troll lever in position to feed the added valve. I use this method on my loader on my JD A. This will allow independent control of both drawn implements. Glennster's idea is the simplest way to do it if you want them both up or down at the same time. The unit that is easiest to lift will raise first, as soon as it is all the way up, the other will raise. You may not be able to precisely control the depth of the drawn units, but if that's not important it sure is easy.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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