成人电影啪啪视频在线观看_日本久久一级黄色电影_日本三级激情网_伊人网址_欧美激情小视频网站试看一区二区三区 _黄色在线网站_丁香五月天激情视频_亚洲区操_91起碰_365伊人影院_国产日日日日网站_一级A片三男四女_意大利精品一区二区_国产无码操逼毛片_久久一级黄片播放

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.