A professional who inspects, repairs, and maintains functional parts of automotive and mechanical equipment and machinery, such as pumps, compressors, pipe-laying machines, ditchdiggers, trucks, and tractors used in petroleum exploration, on oil fields, in pipeline construction, and in airfield maintenance and pipeline operations, using hoists, handtools, gauges, drills, grinding wheels, and testing devices. Respnsibilities include:

• Inspects defective equipment and diagnoses malfunctions, using motor analyzers, pressure gauges, chassis charts, and factory manuals.
• Disassembles and overhauls internal combustion engines, pumps, pump power units, generators, transmissions, clutches, and rear ends, using handtools and hoist.
• Grinds and reseats valves, using valve-grinding machine.
• Adjusts brakes, aligns wheels, tightens bolts and screws, and reassembles equipment.
• Operates equipment to test its functioning.
• Changes oil, checks batteries, repairs tires and tubes, and lubricates equipment and machinery.