Mark Gasca
Los Fresnos,TX
Summary
Hands-on mechanic with broad experience in vehicle, fleet, and railroad equipment maintenance. Performs preventive maintenance, mechanical and electrical diagnostics, safety inspections, and timely repairs while keeping equipment reliable and service-ready. Communicates clearly on repair needs and supports efficient, compliant work practices.
Overview
12
12
years of professional experience
Work History
Railroad Equipment Maintenance Operator
Loram Maintenance of Way, Inc.
Hamel, Minnesota
06.2026 - Current
- Executed preventive maintenance on equipment and machinery, ensuring consistent optimal performance.
- Repaired and replaced undercarriage frames on rail machines, contributing to improved operational reliability.
- Supported crew members in the operations and maintenance of Loram's maintenance machine, equipment, and on-track vehicles according to guidelines set by the FRA, customers, and Loram's rules and standard operating practices.
- Inspected machinery before shifts and reported safety concerns.
- Performed routine lubrication of moving parts on machinery in accordance with manufacturer's instructions.
- Cleaned electrical wiring and machinery daily to prevent dust buildup and ensure safety.
- Replaced grind stones and spark blankets daily to ensure proper equipment operation.
- Supported crew in track repair and material handling to enhance workflow efficiency.
- Assisted with the installation of new equipment and systems.
Mechanic Technician
SESA Fleet Services
Weslaco, Texas
04.2026 - 06.2026
- Performed preventive maintenance on employer fleet trucks and service vehicles.
- Diagnosed fleet vehicle faults using diagnostic tools and repair manuals.
- Diagnosed mechanical problems and determined solutions to correct concerns.
- Repaired brakes, steering, suspension, and drivetrain components.
- Replaced worn out or defective parts with new ones in accordance with manufacturer's specifications.
- Inspected vehicles for safety compliance before service return.
- Inspected vehicle computer systems to ensure proper functioning.
- Diagnosed electrical problems using wiring diagrams and test meters.
- Documented repair work and maintenance records for fleet operations.
- Maintained detailed records of all services performed on each vehicle.
- Tested batteries for proper charging levels to ensure reliability.
- Installed, fit, cleaned and repaired valves, caps, hoses, pumps and gaskets.
- Operated pressure pumps, air electrical equipment and mechanical equipment.
- Troubleshot, diagnosed, and repaired engineering equipment.
- Generated failure reports and corrective measures on incidents to decrease and prevent failures.
- Trained and guided employees on correct methods for performing different repairs and maintenance services.
Mechanic 3
Nextier OFS
Pleasanton, TX
07.2021 - 01.2026
- Communicated clear repair estimates and service timelines to enhance customer understanding.
- Completed routine vehicle maintenance, including oil changes, tire rotations, and brake service.
- Adjusted and repaired vehicle systems to match manufacturer performance specifications.
- Disassembled equipment to reach and remove faulty parts using hoists and cranes.
- Installed replacement radiators, water pumps, starters, and alternators.
- Replaced brake components to support proper DOT operation.
- Repaired and replaced worn or faulty parts using hand tools, power tools, and precision measuring tools.
- Followed safety procedures during repairs in line with industry standards.
- Serviced Nextier OFS field equipment and diesel engines to ensure reliable and safe operation.
- Diagnosed hydraulic, mechanical, and electrical faults on oilfield service units to facilitate timely repairs.
- Performed preventative maintenance on pumps, motors, and support vehicles.
- Inspected Nextier OFS machinery for leaks, damage, and service needs.
- Followed safety procedures while handling heavy components and hazardous materials.
- Repaired or replaced worn parts such as brake pads and wheel bearings using hand tools and power tools.
- Inspected, serviced, and repaired brakes, exhaust systems, transmissions, engines, suspension systems, drive trains, and fuel systems.
- Monitored shop equipment to maintain safe working condition.
- Replaced faulty wiring harnesses in order to restore proper functioning of electrical systems.
- Tested components with appropriate instruments to ensure proper operation.
- Utilized computer diagnostic equipment to troubleshoot electrical issues in vehicles.
Mechanic 3
Nextier OFS
Odessa, TX
01.2017 - 03.2020
- Executed preventive maintenance services on frac units, ensuring reliability through oil changes and brake repairs.
- Installed new radiators, water pumps, ignition systems, starters, and alternators.
- Inspected brake systems, steering mechanisms, wheel bearings, transmissions, engines, and other vehicle parts.
- Utilized knowledge in engine diagnostics to identify and repair faults in vehicles.
- Adjusted and repaired systems to meet manufacturer's performance specifications.
- Conducted routine inspections to identify potential issues before they became major repairs.
- Overhauled hydraulic operated units, restoring functionality by R&R hydraulic pumps and motors.
- Tested vehicle components to ensure they were in proper working order.
- Mentored junior mechanics in repair techniques, fostering skill development and operational efficiency.
- Followed all safety protocols while performing repairs in accordance with industry standards.
Mechanic
Border Engines
Odessa, TX
11.2016 - 01.2017
- Performed regular maintenance on vehicles, ensuring safety and longevity through oil changes, tire rotations, and brake repairs.
- Adjusted and repaired systems to ensure optimal vehicle performance and reliability.
- Explained repair estimates and timelines to customers, enhancing transparency and trust.
Mechanic
SESA Fleet Services
Weslaco, TX
08.2014 - 10.2016
- Rebuilt engines, transmissions, and other major components to factory specifications.
- Applied engine diagnostics expertise to accurately identify and resolve vehicle faults.
- Diagnosed mechanical problems and determined the best course of action to repair units.
- Dismantled devices to access and remove defective parts, ensuring efficient repair processes.
- Repaired and replaced worn or defective parts using hand tools, power tools, and precision measuring instruments.
- Installed new radiators, water pumps, ignition systems, starters, and alternators.
- Conducted road tests to diagnose repairs and validate effectiveness of completed work.
- Used a wide variety of test procedures and equipment to trace hard-to-locate defects or problems.
Education
Certification - Building Trades
TSC Brownsville
Brownsville08-1998
Skills
- Railroad Machinery Repair
- Mechanical Diagnostics
- Hydraulic System Diagnostics and Repair
- Hydraulic diagnostics and repair
- Hydraulic systems
- Hydraulic schematics
- Hydraulic Component Selection
- Pump and motor maintenance
- Pump maintenance
- Electrical Systems Maintenance
- Electrical Circuit Rewiring
- Engine expertise
- Vehicle inspection
- Vehicle maintenance
- Heavy equipment repair
- Preventive maintenance
- Parts replacement
- Troubleshooting skills
- Problem solving
- Safety compliance
- Attention to detail
- Quality control
- Team collaboration
- Strong Communication and Customer Service
- Electrical Systems Maintenance
- Vehicle maintenance
- Strong Communication and Customer Service
Timeline
Railroad Equipment Maintenance Operator
Loram Maintenance of Way, Inc.
06.2026 - Current
Mechanic Technician
SESA Fleet Services
04.2026 - 06.2026
Mechanic 3
Nextier OFS
07.2021 - 01.2026
Mechanic 3
Nextier OFS
01.2017 - 03.2020
Mechanic
Border Engines
11.2016 - 01.2017
Mechanic
SESA Fleet Services
08.2014 - 10.2016
Certification - Building Trades
TSC Brownsville