Ford 901 Selectospeed transmission/hydrolic fluid


2X what Larry said. They rust out from water in the bottom of the transmission. With a search you will find step by step procedures on this forum for sleeving a new tube inside the bad one.
 
Per chance the tale section transmission seal is leaking or the transmission oil pressure sender is leaking into the hydraulic reservoir. Don't thing I have ever heard of the hydraulic tube in the transmission having a hole sucked into it.
 
(quoted from post at 11:37:56 04/12/20) Per chance the tale section transmission seal is leaking or the transmission oil pressure sender is leaking into the hydraulic reservoir. Don't thing I have ever heard of the hydraulic tube in the transmission having a hole sucked into it.

Wayne, it is surprising that you haven't heard about this. I would say that it comes up around twice a year and there is discussion each time about inserting a tube through the leaking one. There is also a link usually posted to a thread about how to do it.
 
I usually see issues discussed here concern the small pressure pipe getting hydraulic oil into the transmission. In this case the
oil is transferring from the transmission to the hydraulic system. Thus see my previous thread.
 
(quoted from post at 18:57:28 04/12/20) I usually see issues discussed here concern the small pressure pipe getting hydraulic oil into the transmission. In this case the
oil is transferring from the transmission to the hydraulic system. Thus see my previous thread.

Wayne, I looked back through three pages of your posts but didn't find another thread about this. Anyway, neither of the cases is pressurized therefore neither will "push" oil past a bad seal. The oil can only seep. With a hole in the suction line the pump suction force will tend to pull from the transmission because the transmission is closer to the pump than the hydraulic sump pick-up point. I fully agree that a rust through is more likely on the pressure line than the suction, but we have all seen rust go deep in one spot and not at all an inch away.
 
When water sits in the bottom of the transmission both lines rust. It is more common for the pressure line to fail first because of the pressure, but if one line is rusted then the other one probably is too, and they will rust at different rates just because. So while it is not as common, the suction line does sometimes fail first.

If the tractor's history is not known to you, it is also possible that the pressure line failed previously and has already been replaced and the suction line wasn't, so it might be finally failing now.
 
I am really not arguing the point, but it doesn't take much effort to pull the 6 bolt plate off of the side and look. I do know for a fact that a bad oil pressure switch, the one that trips the light on the dash, will pump oil into the hydraulic system. There should be approximately 6# oil pressure at the seal and stitch
 

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