On the bottom of the steering column, the "Steering gear" is really a "pump"
When you turn the steering wheel you are really pumping hyd fluid to the steering cylinder or ram, and that is turning the spindle.
When the engine is running, the hydro charge pump adds pressure and presto, you have power steering.
This type of system is fully hydraulic steering, not power assisted mechanical worm & sector or rack/pinion.
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