i.e., Fluids - maintain proper levels and lubrication, Change mud flaps, Electrical- change light bulbs and fuses, repair wiring, Air system- repair leaks, change lines, Tires- inflate and change, Spray System- bar, cylinders, hand hose, wand and nozzles. Infrastructure and heavy civil construction services include asphalt and concrete paving, site preparation, structural, mechanical, and turnkey services.