How do you increase the hydraulic pressure with out increasing the piston pressure?

To increase hydraulic pressure without increasing piston pressure, you can modify the hydraulic system by using a smaller diameter cylinder or piston. This reduces the area over which the force is applied, thereby increasing the pressure while keeping the force (and consequently the piston pressure) constant. Additionally, employing a hydraulic accumulator can help store energy and increase pressure in the system without directly increasing the piston pressure.