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Introduction: The steering gearbox is a unit that can be found on most of the larger duty trucks and older cars. Gearboxes are used in cases where the weight of the vehicle would be too much for a rack and pinion to handle.
When the wheel is turned, pressure flows to one side and the piston moves. The piston is attached to the steering gears. Hydraulic pressure does the work, and the driver controls the direction by turning the steering wheel. The key to operation is a very sensitive valve system. Both systems use a similar, torsion bar driven valve to direct and relieve pressure in the cylinder.