在液壓系統中，無論是金屬管接頭，還是軟管接頭，都存在容易產生泄漏的問題。對于卡套式管接頭，大多因管道受到較大的外力或沖擊力，使卡套松動或管端面變形而造成泄漏，此時應檢查卡套是否失圓、刃口有無缺損、管端是否完好以及卡套螺母的壓緊程度等，同時還要消除管道外力。對于擴口式管接頭，大多因擴口過度，質量不合要求或多次拆卸，致使擴口變形或裂紋等造成泄漏，此時可將前端截去重新進行擴口。如果使用公母錐頂壓進行密封，其泄漏大多是由于兩錐面有損傷，可用研磨砂對錐面進行研磨。

     在一些用“о”形圈靠端面或外徑密封的場合，其泄漏原因有以下幾種：“о”形圈老化或變形而造成泄漏；“о”形圈裝配不到位，使兩平面連接時壓不平或“о”形圈被切割造成泄漏；“о”形圈未壓實，彈性變形量不足而造成泄漏；“о”形圈止口槽過深而造成泄漏。對此，需重新選擇外徑相同和截面較粗的“о”形圈，也可將帶有止口槽的密封平面進行切削或磨削加工，以減小止口槽深度，使“о”形圈有足夠的彈性變形量（壓縮量一般應在0.35-0.65mm之間）。

    對于采用耐油膠板、羊毛氈、軟鋼紙板、組合密封墊圈或密封膠的管接頭處泄漏，無論是何材質，應檢查其密封件有無破損，變形、老化和粗糙度過大等情況，然后采取相應的措施。

In hydraulic system, whether it is metal pipe joint or hose joint, it is easy to leak. For the jacketed pipe joints, most of them are leaked because the pipe is subjected to large external force or impact force, which causes the jacket to loosen or the end of the pipe to deform. At this time, it is necessary to check whether the jacket is out of circle, whether the edge is defective, whether the end of the pipe is intact, and how tight the jacket nut is. At the same time, it is necessary to eliminate the external pressure of the pipe. For flared pipe joints, most of them are leaked due to excessive flaring, poor quality or multiple disassemblies, resulting in flaring deformation or cracks. At this time, the front end can be truncated and reamed. If the top pressure of the male and female cones is used for sealing, the leakage is mostly due to the damage of the two cones. The cones can be ground with abrasive sand.

In some cases where the "" ring is sealed by the end face or outer diameter, the leakage causes are as follows: the aging or deformation of the "" ring causes leakage; the inadequate assembly of the "" ring causes leakage when the pressure is uneven or the "" ring is cut; the "" ring is not compacted and the elastic deformation is insufficient; and the "" ring groove is too deep to cause leakage. Leak. In order to reduce the depth of the groove, it is necessary to re-select the "" ring with the same outer diameter and thicker cross-section, or to cut or grind the sealing plane with the groove, so that the "" ring has enough elastic deformation (the compression should generally be between 0.35-0.65 mm).

For the leakage of pipe joints with oil-resistant plywood, wool felt, mild steel cardboard, combined sealing gasket or sealant, no matter what the material is, it is necessary to check whether the seals are damaged, deformed, aged and rough, and then take corresponding measures.