a) Oil Tank or Reservoir: This is an oil storage tank in which hydraulic oil is stored. The oil passes through various pipelines and after doing useful work in actuator; the oil returns back to oil tank. In the regions of low temperature, oil heaters are attached to air tanks.

b) Filter: This element filters the oil before going to the next element i.e. pump.

c) Pump: Hydraulic pump is heart of any hydraulic system. Its main function is to create the flow of oil under pressure through entire hydraulic system and hence to assist transfer of power and motion (i.e. useful work). Pump drives by prime mover. (i.e. Motor)

d) Direction control valves/Flow control valves/ Pressure Relief Valves (Fluid Controlling Elements): These valves are fitted in hydraulic system at particular locations. These valves control the flow of oil in the system. They also direct the flow of oil in system as also they control the speed of actuator.

e) Actuators: (Fluid Power utilization elements): These elements are known as actuators (Either rotary or linear). The pressurized oil acts on actuator elements. The oil gives or transfers its power to actuator to create useful work or Mechanical Advantage.

f) Pipelines (Fluid Conducting elements): It is the functional connection for oil flow in the hydraulic system. The efficiency of oil flow is greatly influence by the physical characteristics of piping systems. There are two pipes:

a) Pipe which carry pressurized oil are called as pressure pipelines

b) Pipes which carry low pressurized oil or used oil (are called as return pipelines). Hoses, pipes, pipe fitting are the parts of fluid power pipeline.