Most supervisors and managers are experienced technicians who also assist in diagnosing problems and maintaining quality standards. Technicians may work as a team or be assisted by an apprentice or helper, when doing heavy work, such as removing engines and transmissions. Diesel mechanics and service technicians lift heavy parts and tools, handle greasy and dirty parts, and stand or lie in awkward positions to repair vehicles and equipment. Minor cuts, burns, and bruises are common, although serious accidents can usually be avoided, if the shop is kept clean and orderly and safety procedures are followed. Mechanics and technicians normally work in well-lighted, heated, and ventilated areas, however, some shops are drafty and noisy.
Many employers provide lockers and shower facilities.
Nearly 25 percent serviced trucks and other diesel-powered equipment for customers of vehicle and equipment dealers, leasing companies, or independent automotive repair shops. About 20 percent worked for local and long-distance trucking companies, and another 20 percent maintained the buses and trucks of buslines, public transit companies, school systems, or Federal, State, and local governments. The remaining mechanics and technicians maintained the fleets of trucks and other equipment for manufacturing, construction, or other companies. A relatively small number were self-employed. Nearly every section of the country employs diesel mechanics and service technicians, although most work in towns and cities where trucking companies, bus lines, and other fleet owners have large operations.