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
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相关考题
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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 -
单项选择题
In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）
A.molecular fluid vibration
B.energy losses
C.wide pressure variations
D.mechanical damage to control valves
