Adjusting of rollers is performed by a hydraulic piston set in motion by a hydraulic control, installed outside the pellet mill. The hydraulic operation control is operated by an electronic switchboard.
Two rollers are jointed together by ties, what means that they get closer or more distant from the die simultaneously.
Position of the rollers is regulated by an angular potentiometer situated on the back side of rollers (on the inner part of the main shaft). It informs about the angular position of the pins/bolts of rollers. Knowing the measurements done by the potentiometer, the electronic switchboard, which controls the whole system, can estimate the distance between rollers and the die.
Machine operator chooses the required position and the electronic switchboard puts in motion the hydraulic system and moves the piston until rollers achieve an adequate position.
When the rollers are already put the way the operator wanted the hydraulic system blocks itself automatically thanks to two electric valves. The rollers remain in the required position.

Advantages of this system compared with others, mechanical ones
- hydraulic system is faster
- hydraulic system can work with more power (is stronger)
- hydraulic system is very precise
- maintenance is very simple