Abstract: Mill roller controlling apparatus including a mill roller, a pair of support hydraulic ram assemblies supporting each end of the mill roller and an auxiliary hydraulic ram assembly to which each of the support ram assemblies are connected in closed hydraulic circuit. The apparatus is characterized by the provision of control means such as a gas accumulator which maintains constant pressure in the auxiliary ram assembly whereby on movement of the cylinder or piston of the auxiliary ram assembly, each end of the mill roller will move upwardly or downwardly in unison.