Disadvantages. As usual, the disadvantages arise from the merits. Hydraulic relatively slow jacks – one cycle corresponds to a small pump lift height. Another drawback – the complexity of storage and transportation. Vertical hydraulic jack can be stored and transported in a vertical position except the working fluid can leave the amount allotted to her and randomly spread on the surrounding reality. There are several kinds of hydraulic jacks.
List them car types. Bottle or a vertical hydraulic jack. Its design is shown in the diagram and is probably the most simple. Scope of these jacks is wide because of the large raised a range of scales – from 2 to 100 tons. Particularly widely used "bottles" in freight cars.
In addition to the main advantages of a hydraulic jack, vertical has a few more – it's compact, versatility and large footprint. Of the drawbacks – the already mentioned requirements for storage and transport. Movable ram. The basis of this jack is the same principle as that of the bottle with the only except that the axis of the cylinder is not in the vertical axis and the piston is not aligned directly with the pickup and drives the lifting arm. Movable a jack named because it is a cart on wheels capable of rolling on a flat surface. When lifting the lever and pick-up, the jack is displaced or "rolls" under load, in this case – under the car. Hence the name. In such a motion is the same jack swing lever, and that the bottle is lowered the same way – by turning the valve screw.