Question 68 1AE01 - First Assistant Engineer

The Correct Answer is A **Why option A ("A") is correct:** Component "A" in the schematic represents the Rotary Valve Assembly. In modern power steering gears, the rotary valve is the component that meters and directs pressurized power steering fluid to the appropriate power piston side (left turn or right turn) based on input from the steering shaft. This rotary valve assembly effectively replaced the complex, older-style six-way valve (often a spool valve design) used in early power steering systems to control the hydraulic assist. **Why the other options are incorrect:** * **B) "B":** Component "B" typically points to the Hydraulic Power Piston or Rack Piston. This component converts hydraulic pressure into linear mechanical force to assist the driver in turning the wheels. It is the component *acted upon* by the fluid controlled by the valve, not the replacement valve itself. * **C) "F":** Component "F" usually indicates the Pitman Arm Shaft (Sector Shaft) or the gear that drives it. This shaft transmits the assisted rotational force from the steering gear box out to the steering linkage (e.g., drag link or tie rods). It is a mechanical output component, not the hydraulic control valve. * **D) "H":** Component "H" generally refers to the input mechanism, such as the Worm Gear or the input shaft connected to the steering wheel. This component is where the driver's effort is first applied and where the rotary valve receives its positional input. It is the input mechanism, not the hydraulic control valve itself.