It's not an "extra" bar. There are still only 3 bars.
The top bar being rigidly mounted to the backhoe frame takes out one source of slop, prevents the backhoe from lifting/jumping, and eliminates the possibility of the backhoe going "over center" on the top link and tipping backwards into the tractor.
Maybe this hasn't happened to you, but it has happened to someone, otherwise it would not be designed that way.
As for where to set the 3pt control, you need to "feel" for where it is supporting the weight of the backhoe without trying to lift against the rigid link.
I have a discbine that hangs from the lower link arms of the 3pt with a chain to the toplink. You "feel" out where the chain is tight but not supporting all the weight. It's not difficult.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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