Which component supplies oil to the whole hydraulic system?

• A. Hydraulic power pack
• B. Hydraulic reservoir
• C. Oil pump assembly
• D. Filter unit

Answer: (A)

The main idea is that the source of pressurized hydraulic fluid for the whole system is the hydraulic power pack. This unit isn’t just a pump; it’s the complete module that provides energy and oil to the system. It typically contains the motor, the pump, and the reservoir, and often integrated controls and filtration. Oil is drawn from the reservoir, pressurized by the pump, and then delivered to the system to actuate cylinders and valves. The reservoir by itself only stores oil, and the filter unit only cleans it, so they don’t supply the system, while the power pack is what generates and maintains the necessary flow and pressure for all components.