They also work on construction equipment. Cranes, road graders, bulldozers, and farm equipment are considered this kind of equipment. Diesel engines last longer, use less fuel, and are heavier than gasoline engines. This is why they are used in heavy equipment and vehicles. Mechanics who work on gasoline-powered automobiles and light trucks are covered in the occupational statement on Automobile Mechanics.
Mechanics do preventive maintenance.
This means that they work on equipment before it breaks down. This makes sure that they operate safely, prevent wear and tear to parts, and reduce expensive breakdowns. They also figure out the causes of equipment problems and make the necessary adjustments or repairs. Often, they repair broken parts or install replacement parts. In larger shops, they may specialize in one area.