🔍 Key Concepts

• basic hydraulic system layout (pump, lines, control valve, actuator/winch motor) • difference between stopping the pump and mechanically holding the load • purpose of valves that prevent backflow or unintended motion in hydraulic circuits

💭 Think About

• When the pump stops, what happens to pressure and flow in the system? Does that alone guarantee the load will not move? • Which component in a hydraulic circuit is specifically designed to stop oil from flowing backwards when pressure is lost? • Look at each choice and ask: is this an electrical control issue, an operator control issue, or a hydraulic safety feature that acts automatically?

✅ Before You Answer

• Identify which device in the options actually locks or holds the load without operator action when pressure is lost. • Confirm which option describes a function that works even if the operator does nothing and the power source simply fails. • Eliminate any choices that describe components that do not physically prevent reverse flow of hydraulic fluid in the lines.