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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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