Preparation before use of hydraulic jack

Hydraulic jack in the jacking operation, to choose the appropriate tonnage of hydraulic jack, bearing capacity can not be overloaded, the bearing capacity of the selection of hydraulic jack needs to be greater than 1.2 times the weight of gravity; The minimum height of the hydraulic jack is appropriate. In order to facilitate removal, the minimum height of the hydraulic jack should be suitable to the clearance at the bottom of the weight. When the sleeper supports the heavy object during takeoff and landing, the lifting height of the hydraulic jack should be greater than the sum of the thickness of the sleeper and the deformation of the sleeper.