One function of a replenishing pump...

🔍 Key Concepts

• Pressure-closed hydraulic system – how system pressure is maintained when valves are in neutral and no actuators are moving • Replenishing (make‑up) pump – what it does when there is internal leakage and small losses in a closed system • Difference between feeding control circuits vs. supplying make‑up flow to keep system charged with fluid

💭 Think About

• In a pressure-closed hydraulic system, when the main pump is not stroking, what parts of the system still need a small, continuous supply of fluid to replace leakage? • Which option best matches the idea of replacing lost oil and keeping pressure available for control and positioning, rather than just refilling the tank or charging accumulators all the time? • Think about what component needs a steady, controlled source of hydraulic energy to signal or command larger flow changes in the main system.

✅ Before You Answer

• Verify which choice involves a control or signal-type function, not just bulk storage or emergency backup. • Check which option would need a small but reliable flow even when the main actuators are not moving. • Eliminate any option that sounds like simply returning fluid to the reservoir or constantly charging accumulators under all conditions, which is not how a replenishing pump is normally described.

One function of a replenishing pump installed in many pressure-closed hydraulic systems, is to supply fluid flow to __________.

the reservoir

a servo control circuit

position a manually controlled valve

the main system accumulators under all operating conditions

🔍 Key Concepts

💭 Think About

✅ Before You Answer