单项选择题
Purging air from a hydraulic system is necessary when（）
A.adding small amounts of oil to the system
B.the system has been overheated
C.the system has been drained and then filled with new oil
D.the system has been idle for a long period of time
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相关考题
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单项选择题
Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
A.permanent loss of pump suction
B.worn shaft seals
C.high level in the oil sump
D.low motor RPM -
单项选择题
Air trapped in the hydraulic fluid of a steering system would be indicated by（）
A.an improper rudder response
B.hammering noises in the equipment or transmission lines
C.popping or sputtering noises
D.all the above -
单项选择题
How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）
A.clean the fittings before they are disconnected
B.Place drip pans under leaky fittings
C.Seal any cracks in lines with Permatex
D.Coat all threads with graphite oil
