柱塞泵是液壓系統(tǒng)的一個重要裝置。它依靠柱塞在缸體中往復(fù)運動，使密封工作容腔的容積發(fā)生變化來實現(xiàn)吸油、壓油。柱塞泵具有額定壓力高、結(jié)構(gòu)緊湊、效率高和流量調(diào)節(jié)方便等優(yōu)點。

注意檢修：柱塞泵被廣泛應(yīng)用于高壓、大流量和流量需要調(diào)節(jié)的場合，諸如、工程機械和船舶中。

(1)檢查柱塞有無傷痕和銹蝕現(xiàn)象，必要時應(yīng)更換新品。(2)檢查柱塞副配合情況。將柱塞端頭插人柱塞套內(nèi)，傾斜約60°，若柱塞能在自身作用下緩慢地下滑為配合良好。(3)檢查柱塞副的密封性。用手握住柱塞套，兩個手指堵住柱塞頂端和側(cè)面的進油口。用另一只手拉出柱塞，感到有較大的吸力，放松柱塞立即縮回原位，表明柱塞副密封良好，否則應(yīng)更換柱塞副。(4)檢查出油閥副減壓環(huán)帶是否磨損有臺階或傷痕現(xiàn)象，必要時應(yīng)予以更換。(5)檢查出油閥副的配合情況。用手指堵住出油閥下孔，用另一手指將出油閥輕輕向下壓，當手指離開出油閥上端時，它能自動彈回原位，表明出油閥副密封良好，否則應(yīng)更換出油閥副。(6)檢查挺柱體。噴油泵體和挺柱體之間的標準間隙為0～0.03mm，如超過0.2mm ，則應(yīng)更換零件。(7)檢查柱塞凸緣和控制套的凹槽之間的間隙，應(yīng)為0.02～0.08mm，如超過0.12mm，必須更換控制套。

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