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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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