Which component is used to store hydraulic fluid in a hydraulic power unit?

Which component is used to store hydraulic fluid in a hydraulic power unit?

• A. Accumulator
• B. Reservoir (tank) (correct)
• C. Manometer
• D. Filters

Answer: (B)

The component used to store hydraulic fluid in a hydraulic power unit is the reservoir (tank). This container holds the bulk supply of oil that the pump draws from, providing a ready feed to maintain smooth operation. It also serves several practical roles: it gives space for the fluid to expand as temperature rises, allows air that is carried in with the fluid to separate and escape, and lets settled contaminants drop out of the flow so they’re less likely to reach the pump. By keeping a steady reservoir of fluid near the pump suction, the system helps prevent cavitation and ensures reliable pressure delivery.

In contrast, an accumulator stores hydraulic energy under pressure for quick bursts or dampening; a manometer measures pressure; and filters remove particulates. These serve different functions and do not primarily store the bulk hydraulic fluid.