Steering Gear, Function
| Number | Designation | Number | Designation |
| 1 | Neutral | 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 power steering function is schematically displayed in the graphic above and under "Valve section".
The force of oil pressure built up in the power steering pump affects the piston on the steering rack. The oil flow to the right or left-hand side of the piston is regulated in the valve housing. External pipes lead to both sides from the valve housing.
The rotary valve has three radial grooves, a small one that is fed by servo pump and an upper and a lower groove that are connected with the working cylinders via the outer pipes.