Observing parameter variations in Hydraulic actuator model

For the hydraulic actuator model, variation in the input parameters is not indicating a resultant variation in the actuator pressure or displacement.

For example, changing the hydraulic fluid, or varying the angular velocity input to the fixed displacement pump or even chaning the sin wave amplitude , which is input to the 4 directional valve , is not causing any change in any of the parameters in the hydraulic cylinder or the translational spring.