Help installation, maintenance, and repair workers in maintenance, parts replacement, and repair of vehicles, industrial machinery, and electrical and electronic equipment. They perform duties such as furnishing tools, materials, and supplies to other workers; cleaning work area, machines, and tools; and holding materials or tools for other workers.

Install, inspect, test, maintain, or repair electric gate crossings, signals, signal equipment, track switches, section lines, or intercommunications systems within a railroad system.

Repair and open locks, make keys, change locks and vault combinations and install and repair safes.

Install, service, adjust, or repair coin, vending, or amusement machines including video games, juke boxes, pinball machines, or slot machines.

Inspect, diagnose, adjust, or repair wind turbines. They perform maintenance on wind turbine equipment including resolving electrical, mechanical, and hydraulic malfunctions.

Perform work involving the skills of two or more maintenance or craft occupations to keep machines, mechanical equipment, or the structure of an establishment in repair. Their duties iclude pipe fitting; boiler making; insulating; welding; machining; carpentry; repairing electrical or mechanical equipment; installing new equipment; and repairing buildings, floors, or stairs.

Test, adjust, or repair biomedical or electromedical equipment.

Repair and adjust cameras and photographic equipment, including commercial video and motion picture camera equipment.

Repair, install, adjust, or maintain industrial production and processing machinery or refinery and pipeline distribution systems.

Lubricate machinery, change parts, or perform other routine machinery maintenance.