Disassemble, assemble, install, adjust or repair such items as pumps, conveyors, gear reducers, various types of drive units, agitators, vacuum pumps, compressors, hydraulic cylinders, hydraulic showers, fans, heaters, chains, chain dogs, and hold-downs. -Perform mechanical work on screening, pulping, pumping, forming, pressing, drying, cutting, processing, painting, warehousing, shipping, dust collecting, packaging, and waste disposal equipment, together with related measuring controls, meters, drives, and supporting structures.