They also pull trailers loaded with materials, goods, or equipment within factories and warehouses, or around outdoor storage areas. Excavation and loading machine operators dig and load sand, gravel, earth, or similar materials into trucks or onto conveyors using machinery equipped with scoops, shovels, or buckets. Construction and mining industries employ virtually all e xcavation and loading machine operators . Crane and tower operators lift materials, machinery, or other heavy objects. They extend or retract a horizontally mounted boom to lower or raise a hook attached to the loadline.
Most operators coordinate their maneuvers in response to hand signals and radioed instructions.
Operators position the loads from the on-board console or from a remote console at the site. While crane and tower operators are noticeable at office building and other construction sites, the biggest group works in primary metal, metal fabrication, and transportation equipment manufacturing industries that use heavy, bulky materials. Hoist and winch operators control movement of cables, cages and platforms to move workers and materials for construction, manufacturing, logging and other industrial operations. They also lube and maintain the drum and cables and make other minor repairs. One half of all jobs for hoist and winch operators were found in manufacturing or mining industries.