> True hydraulic steering has no mechanical connection
> to the front end.
Every modern farm tractor in Europe has such a true hydraulic
steering.
If they drive faster, a second hydraulic pressure pump is needed.
One is driven by the engine, the second one is driven by the wheels.
So if the engine fails and the vehicle is still rolling, the wheel
driven pump gives you the hydraulic pressure you need.
If this fails, too, there is a little mechanical oil ppump in the
steering column. So if you turn the steering wheel, you'll produce
hydraulic pressure.
But there is no mechanical connection th the front wheels. As far as=20
I know, the legal top speed for vehicles with such a hydraulic steering
is 50 km/h (31 mph).
Best regards
Andreas
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