Most times when I have had a problem like this the issue has been a bad seal on the pump which won't necessarily leak oil out, but will suck air in when running. Often the other problem is a restriction on the suction line between the reservoir and the pump, especially when the reservoir is below the pump. I know the pump is lower in your situation, but it maybe could still be a restriction in the line (a bend too short causing it to kink?), or a line that it too small.
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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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