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Load Capacity: 4 tons Item Weight:38 lbs Cylinder Min Height:278 mm Max Lifting Height: 120 mm Oil Be Filled: 350 g Working Pressure: 56 Mpa Jack Power Type: Hydraulic Overall Dimension of Case: 23''(L)×12''(W)×7''(H) For Load: Maximum load can not exceed the rated capacity The load can not exceed the half of the capacity when all tubes used. The extension of the piston can net exceed the stroke. For Safety: Working oil: No 10 Check the level of oil, if it is not sufficient, please add the same hydraulic oil. After using, please close the valve with the cover, to keep the oil free from the dust and dirt. Before lifting, please adjust the jack slowly to make the load coaxial with resnect to jack. Tube can not be bent, near to the catting tools and fires, also can not put the weight on it.