The hydraulic system of a deck winch has been drained, flushed, and refilled with hydraulic fluid. An erratic knocking noise from the hydraulic motor when the winch is started would indicate __________.
• Hydraulic systems after maintenance often have one common issue when first started up • What different problems typically sound like in machinery (knocking vs. grinding vs. straining) • How trapped air vs. solid contaminants affect a hydraulic motor’s operation
• Think about what could have changed as a result of draining, flushing, and refilling the system—what new problem might this introduce? • Which of these choices would most likely cause an erratic knocking sound specifically, rather than a steady noise or loss of power? • How would a problem that involves solid particles in oil sound different from a problem involving bubbles in oil?
• Compare which options are directly related to the recent work of draining, flushing, and refilling the system—focus on those first • Ask yourself: which condition can make a hydraulic pump or motor cavitate or behave irregularly when first started? • Eliminate any choice that would more likely cause gradual wear or constant grinding rather than intermittent, erratic knocking.
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