Nestor Vaquera
Dallas,TX
Summary
Lead Diesel Technician with extensive experience in maintaining and troubleshooting high-horsepower diesel and natural gas engines. Proven leadership in coordinating maintenance operations, enhancing fleet reliability through data analysis, and fostering a culture of safety and quality among technicians.
Overview
13
13
years of professional experience
Work History
Lead Technician
Liberty Energy
Midland, TX
02.2026 - Current
- Lead maintenance operations for a fleet of high-horsepower oilfield equipment powered by Caterpillar 3512, Caterpillar G3520, MTU 16V4000 L64, Caterpillar C18, and Detroit Diesel Series 60 engines.
- Analyze engine operating data, fault codes, alarms, and diagnostic information using Caterpillar Electronic Technician (CAT ET) and OEM software to identify developing failures and improve fleet reliability.
- Troubleshoot complex mechanical, electrical, fuel, ignition, hydraulic, and electronic control system issues in high-pressure production environments.
- Coordinated maintenance priorities with operations personnel to maximize equipment availability and minimize downtime during critical field operations, ensuring seamless production continuity.
- Led and mentored technicians by assigning work, providing technical guidance, and ensuring repairs met OEM specifications and safety standards, fostering a culture of quality and compliance.
- Collaborate with Caterpillar technical support, vendors, and operations teams to resolve complex equipment issues and improve long-term asset performance.
- Maintain detailed maintenance documentation, repair history, and equipment records to support reliability planning and operational decision-making.
- Recommended preventive maintenance strategies and corrective actions based on equipment performance trends and recurring failures, enhancing long-term reliability and operational efficiency.
Lead Technician
Dallas Independent School District
Dallas, TX
03.2025 - 02.2026
- Oversee and coordinate daily maintenance and repair operations for the district's fleet of vehicles and equipment, ensuring reliability and compliance with safety and regulatory standards.
- Diagnose and repair complex mechanical and electrical issues on buses, service vehicles, and specialized equipment.
- Implement preventative maintenance schedules to minimize downtime and extend vehicle lifespan.
- Supervised and trained team of technicians, assigning tasks and monitoring performance to ensure high-quality workmanship.
- Collaborate with transportation and operations departments to prioritize repairs and meet critical service needs.
- Ensure adherence to safety protocols and environmental regulations, fostering a safe and efficient work environment.
- Maintained accurate service records and parts inventory using fleet management systems to support operational efficiency.
- Tracked repair costs and parts usage to inform budget planning and identify cost-saving measures.
Mobile Diesel Mechanic
VAQUERA DIESEL SERVICES LLC
Dallas, TX
01.2024 - 01.2026
- Established and operated mobile diesel mechanic company, delivering reliable services that enhanced client trust and satisfaction.
- Leveraged expertise in diesel engine maintenance and repair to optimize equipment performance, directly contributing to increased client satisfaction.
- Implemented preventive maintenance programs, proactively identifying and addressing potential issues to minimize downtime and maximize equipment uptime.
- Delivered exceptional customer service through clear communication and collaboration with clients, ensuring tailored solutions that addressed their specific needs.
- Continuously expanded technical knowledge and skills through ongoing training and certification, ensuring the ability to diagnose and resolve complex diesel-related issues.
Mechanic II, Field Mechanic
LIBERTY OILFIELD SERVICES
08.2018 - 12.2023
- Expertly maintained and repaired a wide range of diesel engines, including MTU 4000's, CAT 3512, CAT C18, and Detroit 60 series, as well as Cyclone blenders and S&S pumps, ensuring optimal performance and safety.
- Demonstrated exceptional troubleshooting and problem-solving skills, efficiently replacing discharge pumps, power ends, and resolving complex hydraulic system issues.
- Utilized diagnostic software extensively to troubleshoot equipment and diagnose faults in electrical systems.
- Utilized field experience to identify and implement preventive maintenance measures, reducing potential issues and minimizing equipment downtime.
- Collaborated with E-Tech team to maintain equipment operationality, directly supporting timely completion of fracking projects.
- Maintained parts inventory and documented work orders, ensuring accurate records and supporting quality maintenance processes.
Technician II/ Night Lead Technician
DALLAS COUNTY SCHOOLS
Dallas, TX
03.2015 - 06.2018
- Determined vehicle condition by conducting thorough inspections and diagnostic tests, identifying worn and damaged parts, working mainly on Cummins engines as well as MaxxForce 7 engines.
- Ensured equipment availability through preventive maintenance, component upgrades, corrosion control, and winterization procedures.
- Resolved vehicle issues by adjusting and assembling components, ensuring functionality of major systems including brakes and air conditioning.
- Verified vehicle performance by conducting test drives and adjusting controls and systems to ensure optimal functionality.
- Contained costs by utilizing warranty coverage and evaluating service options while supervising and guiding junior technicians.
Construction Laborer
GENERAL CONTRACTOR/EDGAR PALACIO
Dallas, TX
09.2014 - 12.2016
Intern-Diesel Technician
DALLAS COUNTY SCHOOLS
Dallas, TX
08.2013 - 09.2014
Education
Electronics -
EASTFIELD COLLEGE
Dallas, TX05-2016
High school diploma or GED - general atudies
Skyline High School
Dallas, TX07-2014
Skills
- Diesel & Natural Gas Engine Diagnostics
- Equipment Diagnostics
- CAT ET
- Root Cause Analytics & Troubleshooting
- Fleet Reliability & Equipment Performance
- Preventative Maintenance & Maintenance planning
- Fleet operations
- Data analysis
- Technical leadership
- Microsoft Office Suite
- MTU DiaSys
Languages
English
Spanish
Timeline
Lead Technician
Liberty Energy
02.2026 - Current
Lead Technician
Dallas Independent School District
03.2025 - 02.2026
Mobile Diesel Mechanic
VAQUERA DIESEL SERVICES LLC
01.2024 - 01.2026
Mechanic II, Field Mechanic
LIBERTY OILFIELD SERVICES
08.2018 - 12.2023
Technician II/ Night Lead Technician
DALLAS COUNTY SCHOOLS
03.2015 - 06.2018
Construction Laborer
GENERAL CONTRACTOR/EDGAR PALACIO
09.2014 - 12.2016
Intern-Diesel Technician
DALLAS COUNTY SCHOOLS
08.2013 - 09.2014
Electronics -
EASTFIELD COLLEGE
High school diploma or GED - general atudies
Skyline High School