Repair and construction Logically, grinders undergo wear as a result of their work. OVER TÉCNICA AMBIENTAL, S.L. has a technical service and maintenance programs. In addition, our technical service makes a grinder repair and rebuilding program available to you.   From rectification of rotors, bearings, and grinding chambers up to substantial modifications in the grinding system, even the installation of new rotors adapted to the original grinding chamber, achieving a grinder updated to current technologies.