20w50 will probably be ok. I know of some using 15w40 diesel oil with no problems. If you can find non detergent oil it would be better because the design of that pump with the original GL-1 which is non detergent, it will let particles of dirt in the oil settle to the sump and they remain there until the pump is removed and it is all cleaned out. If a high detergent oil is used it will keep the particles in suspension and they will keep being ran thru the hydraulic pump since there is no filter. So non detergent would be better, low detergent would be ok.
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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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