Trades Helpers I/II assist and learn from experienced Outside Machinists in the accomplishment of the task(s) outlined below: Remove, overhaul, troubleshoot, repair, install, and/or align auxiliary systems and associated equipment/components such as shell and tube heat exchangers, compressors, pumps, forced draft blowers, various types of valves, cargo handling machinery, anchor handling gear, boat davits, cranes, elevators, conveyors, evaporators, and boilers. Use precision measuring instruments such as height gages, depth gages, calipers, verniers, various types of micrometers, and assists in the use of optical equipment.