by 
The Curious Bag
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Full hydraulic steering is one of the few viable alternatives to traditional rack-and-pinion systems. Hydraulic steering offers a number of advantages, you need to ensure that you choose the right components for proper operation.
Function
A hydraulic steering system does away with mechanical steering linkages in favor of a series of pumps and rams.
Components
The steering wheel is usually connected to a pump with four outlets. Two of these connect to either side of the steering-ram cylinder to provide steering. The other two run to a power-assist system.
Advantages
Hydro-steer systems eliminate the need for mechanical steering connections, allowing for more suspension travel. They also greatly simplify the mechanics of four-wheel steering.
Traditional Applications
Due to its weight, complexity and cost, hydraulic steering is most often found on heavy-duty industrial applications that already use some sort of hydraulic system.
Common Fears
Though many in the off-road market label hydro-steer systems as dangerous, it's worth bearing in mind that stock brakes are hydraulic as well.
Source:
Resource:
Hydro-Steer Jeep (Video)
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