Question 1: Most of the failures in hydraulic systems show similar symptoms: a sudden or gradual loss of high pressure, resulting in loss of power or speed in the cylinders.

Question 2: Any major component - pump, relief valve, directional valve, or cylinder may be at problem.

Question 3: The most frequent trouble encountered in a hydraulic system is __________________.

Question 4: Many times, operators of hydraulic equipment will never give the equipment any attention or maintenance until it fails.

Question 5: If the gauge pressure does not rise above a low value, say 100 PSI, and if the volume of flow does not substantially decrease as the relief valve adjustment is tightened, the relief valve is probably not at fault, and should be cleaned or replaced.

Question 6: If the oil flow substantially decreases as the relief valve adjustment is tightened, and if only a low or moderate pressure can be developed, this indicates pump problems.

Question 7: If the pump is delivering full pressure when operating across the relief valve, both pump and relief valve should be considered good, and the trouble is further downstream. The cylinder should be tested first for worn out or defective packing.

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Cavitations

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