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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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