To transmit and control power through pressurized fluids, an arrangement of inter-connected components is required. These components are combined to create a hydraulic system.
In most machine hydraulic systems, the fluid is some type of oil. This hydraulic oil is used to transmit force through a conductor (pipe or hose) to an actuator (cylinder, motor, etc).
In this instruction, you will observe that the oil is displayed in several colors representing the various states and/or pressure of the oil. The hydraulic oil colors used in this course are displayed as follows: