新聞：A4VSO250E01/30R-PPB13N00-S0368銷售

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維護與保養 （1）在運轉前必須檢查，控制油位。在泵***次運轉 30 小時以后須更換潤滑油。以后每工作200小時換油一次。 （2）全部螺絲必須擰緊。 （3）泵在運轉過程中，潤滑油溫度不得大于 70 ℃，介質溫度不得大于 55 ℃ 。 當柱塞在曲軸帶動下做回程運動時，泵頭工作缸內腔溶積逐漸增大，壓力逐漸下降，造成了局部真空，排液閥處于閉合狀態。在壓差作用下進液閥打開，液體進入工作缸。柱塞繼續移動到回程極限位置時吸液過程終了，這時工作缸內吸液最多。當柱塞做進程運動時，工作缸的容積逐漸減小，液體受擠壓，壓力增加，使進液閥關閉，排液閥打開，液體從排出管中排出。柱塞達到進程極限位置時，工作腔內的容積最小排液過程完畢。由于柱塞不斷地往復運動，泵的吸液，排液過程就不斷交替進行，高壓液體就不斷地輸出。

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