A hydraulic system gear pump being fed from...

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Question 1 of 205eccef9cbacbc34ba4d459f2

A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?

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🔍 Key Concepts

• Hydraulic gear pump failure modes (pitting, cavitation, aeration) • Effect of reservoir pressure or vacuum on pump inlet conditions • How flow restrictions in return or suction lines affect pump inlet pressure and bubble formation

💭 Think About

• Which option would most directly affect the inlet side of the gear pump and promote cavitation or aeration? • How does low absolute pressure at the pump inlet relate to vapor bubbles collapsing on gear teeth, causing pitting? • Would a restriction in the return line or an issue in the reservoir headspace be more likely to change the pump’s inlet conditions?

✅ Before You Answer

• Identify which choices change pump inlet pressure (suction conditions) rather than discharge pressure. • Recall that cavitation (formation and collapse of vapor bubbles) is a primary cause of pitting in pump internals. • Verify which condition would cause low absolute pressure at the pump inlet, encouraging bubble formation before the gears.

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