在液压系统中，无论是金属管接头，还是软管接头，都存在容易产生泄漏的问题。对于卡套式管接头，大多因管道受到较大的外力或冲击力，使卡套松动或管端面变形而造成泄漏，此时应检查卡套是否失圆、刃口有无缺损、管端是否完好以及卡套螺母的压紧程度等，同时还要消除管道外力。对于扩口式管接头，大多因扩口过度，质量不合要求或多次拆卸，致使扩口变形或裂纹等造成泄漏，此时可将前端截去重新进行扩口。如果使用公母锥顶压进行密封，其泄漏大多是由于两锥面有损伤，可用研磨砂对锥面进行研磨。

     在一些用“о”形圈靠端面或外径密封的场合，其泄漏原因有以下几种：“о”形圈老化或变形而造成泄漏；“о”形圈装配不到位，使两平面连接时压不平或“о”形圈被切割造成泄漏；“о”形圈未压实，弹性变形量不足而造成泄漏；“о”形圈止口槽过深而造成泄漏。对此，需重新选择外径相同和截面较粗的“о”形圈，也可将带有止口槽的密封平面进行切削或磨削加工，以减小止口槽深度，使“о”形圈有足够的弹性变形量（压缩量一般应在0.35-0.65mm之间）。

    对于采用耐油胶板、羊毛毡、软钢纸板、组合密封垫圈或密封胶的管接头处泄漏，无论是何材质，应检查其密封件有无破损，变形、老化和粗糙度过大等情况，然后采取相应的措施。

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.