Marcus T. Delgado

Profile

ASE Master-certified Senior Diesel Mechanic with 14 years diagnosing and overhauling Class 6–8 commercial trucks, construction equipment, and refrigerated transport units. Specialize in Cummins, Detroit Diesel, and PACCAR engine systems with deep expertise in emissions compliance and predictive maintenance programs. Reduced fleet downtime by 31% at current employer by introducing a structured PM scheduling system across a 90-unit fleet.

Work Experience

Lead Diesel MechanicMar 2019 - Present

Panhandle Freight Solutions, Amarillo, TX

Overhauled and returned to service 23 Class 8 Kenworth and Peterbilt tractors annually, cutting average repair turnaround from 4.2 days to 2.7 days through parts pre-staging and workflow redesign.
Designed and implemented a 90-unit preventive maintenance schedule in Fleetio, reducing unplanned roadside breakdowns by 31% and saving an estimated $118,000 in emergency tow and rental costs over two years.
Mentored 3 junior mechanics on Cummins ISX15 and Detroit DD15 diagnostics using Insite and DiagnosticLink software, improving first-time fix rate from 74% to 91% within 18 months.

Diesel Mechanic IIJun 2014 - Feb 2019

High Plains Equipment Rental, Lubbock, TX

Serviced and repaired a mixed fleet of 140+ units including Caterpillar 320 excavators, John Deere 644 wheel loaders, and Freightliner cab-over trucks, maintaining 97% equipment availability during peak rental season.
Performed DPF cleaning, EGR valve replacements, and SCR system calibrations on 35 units to bring the entire rental fleet into EPA Tier 4 Final compliance ahead of a state audit, avoiding potential fines exceeding $40,000.
Diagnosed and resolved a recurring fuel-injection timing fault on 12 Caterpillar C7 engines that had stumped two previous technicians, eliminating $6,200/month in repeat warranty claims.

Diesel Mechanic IAug 2010 - May 2014

Southwest Truck & Trailer Service, Amarillo, TX

Completed 400–600 hour scheduled services on long-haul semi-trucks including engine oil analysis, injector testing, turbocharger inspection, and air-brake certification checks, processing an average of 11 units per week.
Assisted lead mechanic in a full in-frame overhaul of a Cummins N14 engine, reducing shop labor hours on the job by 14% through proactive component staging and documentation of the rebuild sequence.
Earned ASE T4 (Brakes) and T2 (Diesel Engines) certifications within first 18 months, accelerating promotion to Mechanic II one year ahead of the standard track.

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