Ability to: recognize defects in mechanical equipment and take corrective action; use and maintain hand and power tools used in the mechanical trades such as wrenches, soldering irons, cutting and welding equipment, hammers, files, grinders, buffers, and drills; as applicable to specific positions, work under filthy and obnoxious working conditions; and understand and follow oral and written instructions. pumps, compressors, welding machines, jack hammers, concrete mixers, electric motors, blowers, gear reduction units, gasoline and diesel engines, portable pumps and generators, centrifuges, boilers, and heat exchangers)?.