The hydraulic transmission system of the hydraulic press mainly focuses on pressure transformation, with high system pressure, large flow rate, and high power output. Therefore, it is crucial to pay special attention to increasing the utilization rate of the prime mover's power and preventing impact and vibration during pressure release to ensure safety and reliability.

The hydraulic press can complete the basic working cycle of rapid descent, decelerating pressing, pressure holding with delay, pressure release, and stopping (at any position) according to the pressing process requirements, and the pressure, speed, and pressure holding time are adjustable. The ejector cylinder is mainly used for ejecting workpieces, requiring the ability to perform ejection, retraction, and stopping actions. For example, during thin plate stretching, it also requires auxiliary actions such as the rise, stop, and pressure return of the ejector cylinder. Sometimes, the blank cylinder is also used to tightly press the billet to prevent edge creases.

Hydraulic presses are primarily specified by the higher pressure (in tons) that the main actuating mechanism (main cylinder) can output, and this has been standardized. The tonnage of the top-feeding cylinder is typically 20% to 50% of the main cylinder tonnage. The ejector cylinder of a extruder can use approximately 10% of the main tonnage. For the side-press cylinder of a double-acting stretch hydraulic press, it is generally about 60% of the stretching cylinder tonnage.

The speed of the main cylinder is determined by the pressure processing process. Generally, in hydraulic systems supplied directly by the pump, the working stroke speed does not exceed 50mm/s, the rapid feed speed does not exceed 300mm/s, and the rapid return speed of the hydraulic press is equal to the rapid feed speed.