Which statement is true about hydraulic system minimum requirements?

• A. Source of Power
• B. Lubrication System
• C. Reservoir
• D. Cooling System

Answer: (A)

The essential idea here is that a hydraulic system can only generate pressure and move actuators if there is a source of power to drive the pump. Without energy to turn the pump, fluid can’t be forced through lines or into actuators, so nothing operates regardless of how well the rest of the system is designed. That energy input is the starting point for any hydraulic actuation.

The other elements play important roles for reliability and longevity—lubrication reduces wear on moving parts, a reservoir provides a supply of hydraulic fluid and helps with priming and settling, and a cooling system removes heat generated during operation. None of these by themselves creates the pressurized flow needed to perform work, so they’re supplementary rather than the fundamental requirement for basic hydraulic operation.