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
更多“Purging air from a hydraulic system is necessary when（）”相关的问题
A、changing over to hand pump operation B、engaging the trick wheel C、the system has been filled with new oil D、the rudder angle indicator does not match the helm position
A、extremely cold air from shore passes over warmer water B、warm dry air from shore passes over cooler water C、cold ocean water evaporates into warm air D、cool rain passes through a warm air mass
A、Extremely cold air from shore passes over warmer water B、Warm dry air from shore passes over cooler water C、Cold ocean water evaporates into warm air D、Cool rain passes through a warm air mass
A、for the release of air B、for the release of water C、in order to the release of air D、because the release of air
A、broken inlet valves B、broken discharge valves C、pulsations in the air distribution system D、overloading of the air distribution system
A、keep the air from being carried into the engine B、keep the moisture from being condensed C、keep the danger from being carded into the engine D、take away the condensate from the air
A、an auxiliary reservoir B、a controlling air bottle C、an emergency air compressor D、a main air compressor
A、noise coming from that air starting valve B、continuous operation of the starting air compressor C、zero air pressure in the air starting system D、overheated starting air pipe to the cylinder head
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