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 Fig 1 and Figure.
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.