Journeyman Diesel Mechanic IState Truck IncJourneyman Diesel MechanicBillings, MTDiagnose and Repair: Troubleshoot complex mechanical, hydraulic, electrical, and electronic systems on heavy-duty diesel trucks using advanced diagnostic tools, schematics, and technical manuals (e.g., Cummins Insite, Detroit Diesel Diagnostic Link). Preventive Maintenance: Perform routine maintenance including oil changes, filter replacements, brake adjustments, tire inspections, and chassis lubrication to ensure reliability and regulatory compliance.