Maintains and repairs hot and cold water pumping systems including motor replacement, bearing and shaft seal replacement, mounting and alignment techniques for proper operation, replacement of rubber and chain drive couplings; repair and rebuild triple duty valve, Y strainer assemblies; check valves, air and sludge separators, air bleeds and water treatment, air scavenging and sludge removal. Under the direction of the Maintenance Supervisor performs skilled mechanical maintenance duties in the construction, diagnosis, repair, installation and alteration of District heating, ventilation, air conditioning and refrigeration systems and related equipment and facilities; performs preventive maintenance and routine servicing of equipment to assure efficient operation.