Analyzes malfunctions and repairs, rebuilds, and maintains construction equipment such as power shovels, scrapers, paving machines, motor graders, trench digging machines, conveyors, bulldozers, pumps, compressors, loaders, and pneumatic equipment. Operates and inspects machines or equipment to diagnose defects. Dismantles and reassembles equipment, using hoists and hand tools. Examines parts for damage or excessive wear using micrometers and gauges. Replaces defective engines and subassemblies such as transmissions. Tests overhauled equipment to ensure operating efficiency. Welds broken parts and structural members. May direct workers engaged in cleaning parts and assisting with assembly and disassembly of equipment.