亚洲AV第二区国产精品,无码精品人妻一区二区三区人妻斩,欧美人妻中文字幕,刺激的至亲乱45部之交换

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.