The Steiners I've seen used a Sundstrand hydro, and according to Tractordata, the "420" used a "15" series Sundstrand hydro. Parts should still be available from a Sauer-Danfoss dealer.
The "charge pump" for the hydro in addition creates flow and pressure for the hydraulic lift.
If the hydro is working/tractor moves normally, the charge pump is at least working to some degree.
There's a "charge pressure relief valve" and also an "implement relief valve" built into the charge pump area, could be an issue there.
I've posted a link to the factory manual below.
It would only take same VERY basic hydraulic test equipment to determine exactly what's wrong, with that manual at hand.
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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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