They use micrometers and gauges to measure wear on parts, and a variety of testing equipment. Most mobile heavy equipment repair shops are well ventilated, lighted, and heated. Many mechanics work indoors in shops, but others work as field service mechanics and spend much of their time away from the shop working outdoors. When mobile heavy equipment breaks down at a construction site, it may be too difficult or expensive to bring it into a repair shop, so a field service mechanic is sent to the job site to make repairs. For many mechanics, the independence and challenge of field work outweigh the occasional long hours or bad weather, but other mechanics are more comfortable with the routine of shop work and the opportunity to work as part of a team.
Mechanics handle greasy and dirty parts and often work in awkward or cramped positions.
They sometimes must lift heavy tools and parts, and must be careful to avoid burns, bruises, and cuts from hot engine parts and sharp edges of machinery. However, serious accidents may be prevented when the shop is kept clean and orderly and safety practices are observed. Employment Mobile heavy equipment mechanics held about 101,000 jobs in 1994. Over half worked for mobile heavy equipment dealers and construction contractors. Other mobile heavy equipment mechanics worked for surface mine operators, public utility companies, logging camps and contractors, and heavy equipment rental and leasing companies.