The Diesel and CNG Tractor Mechanic is responsible for repairing, maintaining and troubleshooting for all fleet equipment including tractor Compressed Natural Gas (CNG) and diesel engines (fuel systems and electrical systems), 53' trailers, pneumatic brakes systems, engine diagnostics, and CNG/diesel engine drive trains. The Tractor / Trailer Mechanic will perform preventative maintenance inspections and comply with DOT regulations. Inspect and repair tractor and trailer under carriage components to include shocks, wheel bearings, air suspension components and front-end assemblies. Diagnose and repair CNG and diesel engine failures to include fuel systems, electrical systems, DEF systems and mechanical system malfunctions.