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Responsible for skilled maintenance and repair of diesel and heavy duty equipment, including trucks, road construction and maintenance machinery and vehicles, medium and light weight equipment, and high performance engines. Performs equipment troubleshooting to test operational efficiency and determine cause of malfunction. Prescribes and performs repairs to equipment. May provide lead work direction to semiskilled or unskilled workers. Performs related work as required. Knowledge of: * Heavy equipment maintenance and repair techniques sufficient to perform installation, repair, and maintenance on heavy, medium, and light equipment. * Heavy equipment repair tools and rebuilding equipment sufficient to make correct and safe use of these in the repair and maintenance of equipment. * Metal forging, forming and tempering sufficient to repair equipment to working order. * Arc and acetylene welding sufficient to repair damaged equipment and to modify existing equipment per required specifications. Ability to: * Detect, diagnose, and repair mechanical defects sufficient to perform preventive maintenance on equipment. * Use electronic, computerized, and/or precision measuring instruments sufficient to diagnose, repair, and maintain equipment. * Understand and follow oral and written instructions sufficient to carry out repair orders and understand maintenance records and equipment specifications. * Keep repair records sufficient to log, track, and retrieve repair and maintenance histories on equipment.