Rafael Mendoza

• Diagnose and repair diesel engines, fuel, electrical, hydraulic, and aftertreatment systems across a 180-truck fleet, achieving 96% first-time fix rate. • Perform preventive maintenance and DOT inspections that improved on-time PM completion from 78% to 97% and cut roadside breakdowns 22%. • Lead 3 technicians on complex fault-code troubleshooting, reducing average out-of-service time by 18% while maintaining zero lost-time safety incidents.

• Serviced diesel loaders, excavators, and fleet vehicles; completed 35+ work orders monthly with 94% on-time delivery. • Used OEM software and multimeters to isolate electrical and CAN-bus faults, lowering diagnostic labor by 15%. • Rebuilt braking, cooling, and fuel systems under senior oversight while maintaining 100% inspection checklist compliance.

• Prepared 20+ diesel training bays weekly, staged parts, and maintained tooling for hands-on lab sessions with 98% readiness. • Assisted instructors with teardown and reassembly of Cummins and Detroit Diesel components; logged 150+ service-learning hours. • Maintained fluid handling and shop-safety procedures, contributing to zero recordable incidents during two academic years.

Diesel systems, engine performance, hydraulics, electrical diagnostics, OSHA shop safety; CDL-A with air-brake and combination endorsements; ASE-style T2/T3/T4 credentials.

Tools: Cummins INSITE, Detroit DiagnosticLink, Jaltest, TEXA, Fluke multimeter, pressure/vacuum gauges, scan tools, hydraulic test kits, torque tooling, welding and fabrication equipment. Training covered fault-code trees, DPF/SCR aftertreatment, CAN-bus testing, and lockout/tagout.