Linear carriages are so precise that a slight hit during transportation or assembly might cause them to run unsmooth.
Why?
A slight hit may cause End seals or End caps of the linear carriages to drop down and choke the movement.
How to fix it?
Pretty easy. Use a rubber mallet to lightly tap some points of the slider, so that the end caps or end seals can move away.
For more detail, please watch the video or contact us.