Steering Gear, Function
| Number | Designation | Number | Designation |
| 1 | Neutral position | 5 | Servo oil, high pressure |
| 2 | Steering left | 6 | Servo oil, low pressure |
| 3 | Steering right | 7 | Air |
| 4 | Servo oil, free flow |
The steering gear's servo function is displayed schematically in the above image and under the heading "Valve section".
The force of oil pressure built up in the power steering pump affects the piston on the steering rack. The valve housing regulates the flow of oil to the left or right sides of the piston. External pipes lead from the valve housing to both sides. Even the power steering pump pressure hose is connected to the valve housing.
The valve spool has three radial grooves, one in the middle that is fed by the power steering pump and an upper and a lower groove that are connected with the working cylinders via the outer pipes.