A pressurized hydraulic system prevents what?

• A. Overheating
• B. Leaks
• C. Stalling
• D. Freezing

Answer: (C)

Maintaining pressure in a hydraulic system keeps the fluid readily available to do work under load. When you move a control, the pump must deliver fluid at enough flow and pressure to overcome resistance in the actuators. If pressure drops, the fluid can’t develop the required force, and the pump or the actuator can stall, stopping motion. Keeping the system pressurized—even with an accumulator to smooth peaks—prevents those brief demand spikes from causing stalling, and it also reduces the chance of cavitation that can occur if pressure falls too low. The other issues aren’t directly prevented by pressure alone: overheating relates to heat removal and workload, leaks depend on seal integrity, and freezing is a temperature issue.