Self-propelled construction machine

A self-propelled construction machine, comprising:

• a machine frame;
• at least three ground engaging units for supporting the machine frame from a ground surface;
• at least three lifting columns, each lifting column connecting an associated one of the ground engaging units to the machine frame;
• and
• at least one steering drive configured to steer at least one of the ground engaging units, the steering drive including a first part connected to the ground engaging unit and a second part connected to the associated lifting column, the steering drive further including:
• at least one toothed wheel;
• at least one first toothed rack including teeth engaged with teeth of the toothed wheel;
• and
• at least one first linear drive configured to move the first toothed rack to rotate the toothed wheel.

A self-propelled construction machine, comprising:

• a machine frame;
• first, second and third ground engaging units for supporting the machine frame from a ground surface;
• first, second and third lifting columns connecting the machine frame to the first, second and third ground engaging units, respectively;
• and
• a steering drive configured to steer the first ground engaging unit, the steering drive including:
• a toothed wheel connected to one of the first ground engaging unit and the first lifting column;
• a toothed rack including teeth engaged with teeth of the toothed wheel, the toothed rack being connected to the other of the first ground engaging unit and the first lifting column;
• and
• a linear drive configured to move the toothed rack to rotate the toothed wheel.