Which of the following is not considered one of the five basic components of a hydraulic system?

• A. Pressure
• B. Control Device
• C. Liquid
• D. Conductor

Answer: (A)

In a hydraulic system, pressure is a state, not a physical part. The five basic components are the liquid (hydraulic fluid), the conduits (pipes or hoses) that carry the fluid, the control device (valves) that direct and regulate flow, the actuator (cylinder or motor) that converts fluid power into motion, and the power source (pump) that pressurizes the fluid. Since pressure describes the force within the system rather than a separate part, it isn’t one of the components. Therefore, liquid, conductor, and control device are components, while pressure is the resulting condition, making it not a basic component.