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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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