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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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