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 Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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