亚洲AV中文无码字幕色三,中出しレ●プされまくった人妻,一级特黄妇女高潮AA片免费播放,丰满人爽人妻A片二区动漫

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.