But during planting and harvesting seasons, they may travel to farms to make emergency repairs on equipment so that important farming operations are not unduly delayed. Mechanics also perform preventive maintenance. Periodically, they test, adjust, and clean parts and tune engines. In large shops, mechanics generally specialize in certain types of work, such as diesel engine overhaul, hydraulics, or clutch and transmission repair. Others specialize in repairing the air-conditioning units often included in the cabs of combines and large tractors, or in repairing certain types of equipment such as hay balers.
Some mechanics also repair milking, irrigation, and other equipment on farms.
In addition, some mechanics who work for dealers and equipment wholesalers assemble new implements and machinery and sometimes do body work, repairing dented or torn sheet metal on tractors or other machinery. Mechanics use many basic handtools, including wrenches, pliers, hammers, and screwdrivers. They use welding equipment or power tools to repair broken parts. Generally, farm equipment mechanics work indoors. Modern farm equipment repair shops are well ventilated, lighted, and heated, but older shops may not offer these advantages.