The 5900 is essentially a 10 series tractor. What I see in the parts book suggests it has the same priority valve pack as the 10's. So... you need a closed center load sensing valve. There's lots of options out there, all of them expensive. The first thing to check is that the priority valve pack actually has the combining/sequencing spool in the left side bore of the pack. If it has that you can add the CCLS valve and plumb the load sense line to the left side on the combining valve and the supply line to the rear of the pack, then the return line goes into the sump at the lift cover... The easiest solution may be a used valve bank... basically any modern row crop tractor bank will work IF it's ccls. Also lots of stuff out there on forestry/industrial and plow trucks that use Rexroth MP15/18/22 banks. You just need to watch the inlet porting. Prince may also have a cheap solution if you can find the correct inlet and outlet sections.
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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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