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 （1）油泵內(nèi)存有空氣。這個故障一般是在安裝了一臺新泵的時候出現(xiàn)，在開起一臺新泵時，應(yīng)先向泵內(nèi)加入油液，對泵的軸承、柱塞與缸體起到潤滑作用。 處理方法：在泵運轉(zhuǎn)時打開油泵加油口，使泵內(nèi)的空氣從加油口排放出去。

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（2）油箱的油面過低，吸油管堵塞使得泵吸油阻力變大造成泵吸空或進油管段有漏氣，泵吸入了空氣。 處理方法：按規(guī)定加足油液；清洗濾清器，疏通進氣管道；檢查并緊固進油管段的連接螺絲。

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（3）油泵與電機安裝不當(dāng)，也就是說泵軸與電機軸同心度不一致，使油泵軸承受徑向力產(chǎn)生噪聲。 處理方法：檢查調(diào)整油泵與電機安裝的同心度。

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（4）液壓油的粘度過大，使得泵的自吸能力降低，容積效率下降。 處理方法：選用適當(dāng)粘度的液壓油，如果油溫過低應(yīng)開啟加熱

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