When we use the lift we have to check it, of course, this is not only in order to extend the life of the lift, but also to
hope that its role can be fully played. We want to lubricate the transmission equipment, but also to the vulnerable
parts for inspection and replacement, especially in the vibration of the parts, if there is a loose we want to timely 
replacement. Wait until we put all the hydraulic oil clean, we put it back into the tank, and then connect the pipeline.