单项选择题
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
Leakage of hydraulic fluid from around the shaft of a h...
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
Air trapped in the hydraulic fluid of a steering system...
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
How can the chance of contaminating hydraulic fluid be ...
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
