Well for two reasons. 1) It makes the header lift evenly. 2) It takes half the amount of oil to lift the header.
This type of hydraulic plumbing is very common on farm equipment with multiple lift cylinders. When the oil goes to #5 the return oil from it feeds #6 making both cylinder extend but only requiring the system to provide the oil for extending #5. In the extend direction #5 is the master and #6 is the slave cylinder.
Usually systems like this have a valve built into each cylinder that allows them to bleed through when they are completely up. This way they re-phase every time they lift.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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