Which symptom is most commonly associated with cavitation in a hydraulic pump?

Which symptom is most commonly associated with cavitation in a hydraulic pump?

• A. Cracking
• B. Noisy operation
• C. Overcooling
• D. No movement

Answer: (B)

Cavitation in a hydraulic pump happens when the fluid pressure at the pump inlet drops below the fluid’s vapor pressure, causing tiny vapor bubbles to form and then violently collapse as they move into higher-pressure areas. This rapid bubble formation and collapse creates noise and vibration, so the most noticeable and common symptom you’ll hear during operation is a loud, irregular operational noise. Other options don’t fit as the typical immediate sign. Cracking can occur as cavitation damages surfaces over time, but noise is the first and most common symptom. Overcooling isn’t a direct consequence of cavitation, and no movement would indicate the pump isn’t running at all, not cavitation. If cavitation is suspected, check suction conditions, remove air from the system, ensure adequate inlet pressure, and verify there are no blockages or restrictions in the inlet path.

Cavitation in a hydraulic pump happens when the fluid pressure at the pump inlet drops below the fluid’s vapor pressure, causing tiny vapor bubbles to form and then violently collapse as they move into higher-pressure areas. This rapid bubble formation and collapse creates noise and vibration, so the most noticeable and common symptom you’ll hear during operation is a loud, irregular operational noise.

Other options don’t fit as the typical immediate sign. Cracking can occur as cavitation damages surfaces over time, but noise is the first and most common symptom. Overcooling isn’t a direct consequence of cavitation, and no movement would indicate the pump isn’t running at all, not cavitation. If cavitation is suspected, check suction conditions, remove air from the system, ensure adequate inlet pressure, and verify there are no blockages or restrictions in the inlet path.