Question 123General Subjects - 1st Asst/Chief
70% to passIf a hydraulic pump is producing a noisy whine when in operation, the cause may be _______________.
Aan oil leak across the pump shaft packing
Bdue to the wrong direction of rotation of the hydraulic motor
Can air leak in the pump suction line above the oil level in the reservoir
Dlow viscosity in the hydraulic fluid
AI Explanation
The correct answer is C) an air leak in the pump suction line above the oil level in the reservoir. A noisy whine from a hydraulic pump is often caused by air being drawn into the pump through a leak in the suction line. This introduces air bubbles into the hydraulic fluid, which can cause cavitation and a loud whining sound as the pump operates. An air leak above the oil level in the reservoir is a common cause of this issue. The other options are incorrect because: A) an oil leak would not typically cause a whining noise, B) the direction of rotation is less likely to be the issue, and D) low viscosity fluid would not directly cause a whining sound from the pump.
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