Manual hydraulic truck: hydraulic transmission principle, with oil as the working medium, through the change of sealing volume to transfer movement, through the internal pressure of the oil to transfer power.

　　[Power part] Converts the mechanical energy of the prime mover into the pressure energy of the oil (hydraulic energy). For example: hydraulic pump.

　　[Execution part] Converts the oil pressure energy input by the hydraulic pump into the mechanical energy driving the working mechanism. For example: hydraulic cylinder, hydraulic motor.

　　[Control part] Used to control and adjust the pressure, flow and flow direction of the oil. For example: pressure control valve, flow control valve and direction control valve.

　　[Auxiliary part] The first three parts are connected together to form a system, which plays the role of oil storage, filtration, measurement and sealing. Examples include pipes and joints, fuel tanks, filters, accumulators, seals and control instruments.

　　Pressure applied at any point on a given volume of liquid can be transmitted equally in all directions. This means that when multiple hydraulic cylinders are used, each cylinder will pull or push at its own speed, and these speeds depend on the pressure required to move the load. In the case of the same bearing capacity of the hydraulic cylinder, the hydraulic cylinder carrying the minimum load will move first, and the hydraulic cylinder carrying the maximum load will move after the maximum load.

　　In order to synchronize the movement of the hydraulic cylinder so that the load is jacked at the same speed at any point, it is necessary to use a control valve or synchronous jacking system element in the system.

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