1) before use should check whether the parts are in good condition, whether the oil is clean. Hydraulic jack safety pin is damaged, or spiral, rack jack screw, a gear rack wear amounts to 20%, is strictly prohibited.
2) Jack should be set up in the smooth, solid, and skid pad.
3) Jack must be vertical with the surface load, the contact surface and the top of the weight should be added between the antiskid cushion.
4) Jack is strictly prohibited to use, shall not be extended handle, no more than the number of operation.
5) the use of hydraulic jack, no person shall stand in front of the safety.
6) in the process of lifting, with the increase in the weight of the heavy lifting of the insurance cushion, reaching the top of the lift should be in time to firmly.
7) with more than two and two jack and lifting an object, Jack the total lifting capacity should be not less than load twice. The top lift should be unified command by hand, to ensure that the jack's jacking speed and the force is basically the same.
8) the lifting height of the hydraulic jack shall not exceed the limit mark line; the lifting height of the spiral and the rack jack shall not exceed 3/4 of the height of the screw or the height of the rack.
9) Jack can not bear the load in long time no one care.
10) the falling speed of Jack must be slow, it is strictly prohibited to make it suddenly drop under the condition of load.