Hydraulic jack is a kind of the simplest lifting equipment that lifting height is little (less than 1m). The hydraulic jack has compact structure, stable operation and self-locking effect, so it is widely used. Jacks are mainly used in factories, mines, transportation and other fields as vehicle repairs and other lifting, support and other work. Its structure is light and strong, flexible and reliable, and can be carried and operated by one person. As a tool with a wide range of uses, the hydraulic jack can only play its role better if you understand its principle. Next, let's learn how the hydraulic jack works and how to use it.