The power in these presses is provided by hydraulic fluid, which produces the pressure that is generated. A press uses the standard parts for all types of hydraulic machinery, including pistons, hydraulic pipes, cylinders and a stationary die or anvil. You can also buy hydraulic press parts via https://www.macrodynepress.com/hydraulic-press-spare-replacement-parts/
The pistons create a plunging or thrusting motion via liquid under pressure that exerts force. There are two primary cylinders, the small called the slave and the larger the master.
Oil or water is poured into the slave cylinder. As pressure builds is exerts force onto the piston in the larger cylinder. This larger piston then presses in the master cylinder. The action makes the punch connect with the die, which leads to deforming the metal into the shape that is desired.
Forklift tire press: these are used to remove solid tires off forklifts.
Gantry straightening press: this model straightens steel and other materials.
Forging presses: this is a metal forming machine that is powered by hydraulics, forcing metal to take on a specific shape using a particular mold.