久久青草38国产,中文字幕视频在线观看,特级小箩利无套内谢A片,在线观看视频欧美日本11,丰满少妇理论A片在线看潘金莲


NEWS

Hydraulic cylinder piston rod crawling solution

1942 2019/08/27
1. should adjust the coaxiality of the piston and the piston rod.
2. the machining accuracy of the inner wall of the cylinder and the surface of the piston rod are adjusted to the appropriate range.
3. if it is caused by the material of the seal, just replace it.
4. add a venting device in the hydraulic cylinder to discharge air.
5. should adjust the gap between the piston and cylinder, piston rod and guide sleeve inside the hydraulic cylinder.