The tubes are in the transmission area. If the pressure tube has a hole in it the pump will fill the transmission case with hydraulic oil. The tubes are no longer available but there are fixes some have done that will work.
On each end of the tube there is a O ring. These O rings stop leaks where the hydraulic manifold mounts and where the transmission mounts to the center housing.
So if you pressurize the tube and get air bubbles in the transmission the tubes are bad.
If you pressurize the tube and get air bubbles where the two cases mount together the O ring is bad.
If you pressurize the tube and get air bubbles in the center housing (hydraulic housing) the relief valve is most likely the problem.
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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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