Diesel Technician
Sooner Truck Center (Peterbilt) · Tulsa, OK
Jun, 2017 · Feb, 2021
• Lead a 6-tech shop maintaining 180 Class 8 tractors and 240 trailers, cutting unplanned roadside breakdowns 28% via a structured PM program.
• Diagnose Cummins X15 and Detroit DD15 faults with INSITE and J1587 data, averaging under 45 minutes to root cause.
• Rebuild aftertreatment systems (DPF/SCR/DEF) on 40+ units per year, preventing ~$1,900 average SCR-related tow events.
• Recovered $146,000 in warranty parts and labor credits in 2025 at a 94% first-pass approval rate.
• Mentor 3 apprentice technicians; all 3 passed ASE tests within 12 months while shop productivity rose 19%.
Apprentice / Lube Technician
Arrowhead Fleet Services · Tulsa, OK
Aug, 2015 · May, 2017
• Completed 60+ in-frame overhauls per year on PACCAR MX-13, Cummins X15, and Detroit DD15 engines at 97% on-schedule delivery.
• Closed 300+ PACCAR and Cummins warranty claims annually with zero customer-pay reversals.
• Used PACCAR ESA, Cummins INSITE, and Detroit DDDL for calibrations and ECM updates, cutting repeat visits under 3%.
• Performed 1,200+ DOT and pre-delivery inspections, catching defects that prevented 22 post-delivery warranty claims.
• Trained 4 new technicians on bulletin workflow; shop flat-rate efficiency climbed from 92% to 108%.
Fleet Diesel Lead Technician
Red Rock Freight Lines · Tulsa, OK
Mar, 2021 · Present
• Logged 4,000+ supervised apprenticeship hours across PM service, brakes, driveline, and wheel-end repairs on Class 8 trucks.
• Ran 20+ lubrication services daily at 100% checklist compliance, flagging 60+ early defects before breakdowns.
• Assisted senior techs on clutch, transmission, and differential swaps; certified on shop equipment within 90 days.
• Cut average PM bay turnaround from 55 to 38 minutes while holding parts crib accuracy at 99%.