Mark Daniel Rosario - Automotive /Heavy Equipment Maintenance Mechanic - United States Marine Corps

Summary

United states marine corps Veteran with 6 years of experience being a diesel mechanic.

Highly motivated Heavy Equipment Technician experienced in maintaining and troubleshooting heavy machinery. Achieved reductions in machine downtime and improved operational efficiency through strong diagnostic abilities and adherence to safety protocols. Focused on delivering reliable results through effective problem-solving, preventative maintenance, and teamwork.

Overview

9

years of professional experience

Work History

Automotive /Heavy Equipment Maintenance Mechanic

United States Marine Corps

Milpitas

08.2020 - Current

Duties and Responsibilities:Fleet Maintenance & Diagnostics: Performed scheduled preventative maintenance inspections(PMI), troubleshooting, and overhaul operations for a diverse fleet of light and heavy-duty tactical vehicles.Engine & Power Systems: Diagnosed, repaired, and rebuilt multi-fuel and diesel engines, fuel injection systems, cooling systems, and power generation units.Brake & Hydraulic Systems: Serviced and repaired heavy-duty air brake systems, hydraulic braking systems, power steering units, and complex suspension components.Electrical Troubleshooting: Utilized advanced digital multimeters and diagnostic software to trace, isolate, and repair complex 12V/24V electrical faults, wiring harnesses, charging systems, and electronic control modules (ECMs).
Repaired and maintained heavy-duty automatic and manual transmissions, transfer cases, differentials, and drive axles, ensuring optimal vehicle performance and reliability.
Documentation & Asset Management:
Maintained meticulous digital maintenance logs, tracked parts inventory, and completed work orders detailing parts used and labor hours spent.
Duties and Responsibilities:Fleet Maintenance & Diagnostics: Performed scheduled preventative maintenance inspections
(PMI), troubleshooting, and overhaul operations for a diverse fleet of light and heavy-duty tactical vehicles.
Engine & Power Systems: Diagnosed, repaired, and rebuilt multi-fuel and diesel engines, fuel injection systems, cooling systems, and power generation units.
Brake & Hydraulic Systems: Serviced and repaired heavy-duty air brake systems, hydraulic braking systems, power steering units, and complex suspension components.
Electrical Troubleshooting: Utilized advanced digital multimeters and diagnostic software to trace, isolate, and repair complex 12V/24V electrical faults, wiring harnesses, charging systems, and electronic control modules (ECMs).
Supervised a team of junior technicians, oversaw daily maintenance tasks, and managed shop workflow.
Conducted regular inspections of heavy equipment to ensure operational readiness.
Performed diagnostics and repairs on various military machinery and vehicles.
Collaborated with team members to troubleshoot mechanical issues effectively.
Maintained accurate records of maintenance activities and repairs completed.
Utilized hand tools and power tools for equipment maintenance tasks efficiently.
Adhered to safety protocols while working on heavy machinery in diverse environments.
Assisted in training junior mechanics on maintenance procedures and best practices.
Implemented preventive maintenance schedules to enhance equipment longevity and reliability.
Maintained a logbook detailing all services rendered to the machines for audit purposes.
Inspected, tested and diagnosed mechanical problems in heavy equipment components.
Checked electrical connections for proper installation and operation according to safety standards.
Maintained records of all maintenance activities performed on each machine for future reference.
Ordered spare parts required for completing repairs efficiently from authorized suppliers.
Conducted troubleshooting to diagnose faults in the hydraulic systems of the machinery.
Installed new components including pumps, starters and alternators in line with manufacturer's specifications.
Advised management about any potential safety hazards that could arise from improper handling of equipment.
Followed company guidelines while working on hazardous materials such as fuel, oil or lubricants.
Provided technical support to operators regarding safe use of the machinery.

Security Officer

Securitas Security Services USA

Milpitas

10.2017 - 07.2020

Monitored premises to ensure safety and security for employees and visitors.
Conducted regular patrols to identify and address security concerns promptly.
Implemented access control measures to manage entry of personnel and vehicles.
Responded to alarms and incidents, coordinating with local law enforcement as needed.
Documented daily activities and incidents in detailed reports for management review.
Trained new security personnel on protocols and emergency response procedures.
Collaborated with team members to maintain a safe work environment for all staff.
Assisted in developing security policies that enhance workplace safety standards.

Education

Automotive Technician

MTMIC

02.2021 - 05.2021

St. John Catholic School

San Francisco, CA

Skills

Engine rebuilding
Diesel engine repair
Hydraulic systems diagnosis
Brake system maintenance
Parts ordering
Vehicle inspection
Diesel engine maintenance
Bulldozer operations
Heavy equipment diagnostics
Bulldozer operation

Transmission repair
Tire and wheel service
Hydraulic cylinder repair
Backhoe loading
Certified large hydraulic crane operator
Electrical troubleshooting
Hydraulic systems repair
Fleet diagnostics
Hydraulic systems

Timeline