Seth Mattox
Nevada City,CA
Summary
Heavy Equipment Mechanic with over 19 years of journey-level experience performing advanced diagnostics, preventative maintenance, major component repair, and full system overhauls on heavy-duty equipment, diesel engines, and emergency response vehicles. Extensive experience supporting public agency operations, including Caltrans and Nevada County Fleet Services, with a strong focus on maintaining mission-critical equipment readiness for wildfire support, emergency response, and severe weather operations. Highly skilled in diesel systems, hydraulics, electrical diagnostics, fabrication, and mobile field repair. Proven ability to work effectively in high-pressure, hazardous environments, including wildfire conditions, extreme heat, snow, and remote terrain. Demonstrates strong adherence to safety procedures, chain of command, and operational readiness standards, making a strong candidate for CAL FIRE fleet operations.
Overview
20
20
years of professional experience
1
1
Certification
Work History
Heavy Equipment Mechanic II
Nevada County Fleet Services
01.2025 - Current
- Perform full-scope diagnostics, maintenance, and repair on a wide range of county fleet vehicles and heavy equipment used in road maintenance, emergency response, and wildfire support operations.
- Conduct preventative maintenance inspections and scheduled servicing to ensure fleet reliability and readiness
- Diagnose and repair: Diesel and gasoline engines, Hydraulic systems (pumps, cylinders, motors), Electrical systems and wiring faults, Pneumatic and air brake systems, Cooling and fuel systems
- Perform major component repairs, including engine removal, installation, and complete overhauls
- Troubleshoot and repair CANBUS and electronically controlled systems
- Perform welding and fabrication for structural repairs and equipment modifications
- Maintain and repair: Water trucks (critical for fire suppression support), Plow trucks and snow removal equipment, Motor graders, loaders, and skip loaders, Sweepers and vegetation management equipment, Trailers (low-bed, transfer, flatbed), Cranes, pickups, and transport vehicles
- Perform mobile field service repairs in remote and hazardous environments
- Conduct heavy equipment tire service (mounting/dismounting)
- Utilize diagnostic equipment including Fluke meters, hydraulic gauges, and OEM software systems
- Manage work orders, preventative maintenance schedules, and parts inventory
- Operate equipment safely for testing and transport (CDL required)
- Maintain a safe and clean work environment in compliance with safety standards
- Work in extreme environmental conditions (heat, cold, snow, smoke, hazardous terrain)
- Demonstrate strong time management, initiative, and ability to respond to emergency repair needs
- Supervisor: Josh Hilinski | 530-273-7481
Heavy Equipment Mechanic
Caltrans
01.2022 - 01.2025
- Performed maintenance, inspection, and repair of state-owned fleet vehicles and heavy equipment essential to highway safety and emergency operations.
- Conduct preventative maintenance and BIT inspections in compliance with regulations
- Diagnose and repair: Diesel engines and fuel systems, Hydraulic and pneumatic systems, Electrical systems and electronic controls, Air brake systems, suspension, and steering
- Maintain equipment including: Snowplows and plow trucks, Sweepers and roadway maintenance equipment, Graders, loaders, and transport vehicles, Cranes, pickups, and support vehicles
- Perform emergency repairs during severe weather events to maintain operational readiness
- Conduct field service repairs and travel between maintenance locations
- Utilize Asset Manager system for work order tracking and documentation
- Order, track, and manage parts inventory
- Use service manuals and digital resources for diagnostics and repairs
- Test drive and operate commercial vehicles under CDL requirements
- Supervisor: John Ott | 530-751-6218
Heavy Equipment Mechanic
Bigge Crane
01.2020 - 01.2022
- Conduct 90-day inspections and DOT/BIT compliance inspections
- Diagnose and repair: Hydraulic systems and cylinders, Electrical systems and control systems, Pneumatic systems
- Maintain and repair: Rough terrain cranes, All-terrain cranes, Boom trucks and articulating cranes, Forklifts, scissor lifts, and manlifts
- Perform: Engine removals and overhauls, Differential repairs and drivetrain work, Boom assembly disassembly and rebuilds, Outrigger and hoist system repairs, Brake system repairs (disc, drum, WABCO)
- Diagnose crane safety systems including: Load Moment Indicators (LMI), Anti-two-block systems, Load cells and angle sensors
- Perform field service work in high-risk environments including refineries
- Supervisor: Scott Delay | 510-867-5348
Heavy Equipment Mechanic
Coast Crane / Maxim Crane
01.2006 - 01.2020
- Provided long-term maintenance and repair support for crane fleets and heavy equipment, demonstrating increasing responsibility and advanced mechanical expertise over a 14-year career.
- Perform full diagnostics, maintenance, and repair of crane equipment
- Rebuild and repair: Hydraulic cylinders, valve banks, and swivels, Hydraulic hoses and fluid systems, Boom assemblies, cables, and chains
- Diagnose and repair: Electrical systems (12V / 24V), Hydraulic control systems, Load-sensing systems, Wireless remote control systems
- Conduct inspections, preventative maintenance, and emergency repairs
- Perform both shop and field service work
- Maintain digital service records and parts inventory systems
- Demonstrate strong reliability, work ethic, and mechanical proficiency
- Supervisor: Kevin Bohn | 916-240-0188
Education
High School Diploma -
Corning High School
Corning, CaliforniaSkills
- Preventative Maintenance & Fleet Readiness
- Diesel Engine Diagnostics, Repair & Overhaul
- Hydraulic System Troubleshooting & Rebuild
- Electrical Systems (12V / 24V / CANBUS)
- Pneumatic & Air Brake Systems
- Welding, Fabrication & Structural Repair
- Fleet Operations & Work Order Systems
- Emergency Equipment Readiness
- Field Service & Mobile Repair
- Parts Procurement & Inventory Control
- Safety Compliance & Hazard Awareness
- Public Agency Fleet Support
Certification
- Class B Commercial Driver License (CDL)
- CPR Certified
- DOT / BIT Inspection Experience
Timeline
Heavy Equipment Mechanic II
Nevada County Fleet Services
01.2025 - Current
Heavy Equipment Mechanic
Caltrans
01.2022 - 01.2025
Heavy Equipment Mechanic
Bigge Crane
01.2020 - 01.2022
Heavy Equipment Mechanic
Coast Crane / Maxim Crane
01.2006 - 01.2020
High School Diploma -
Corning High School
ADDITIONAL QUALIFICATIONS
- Available for emergency response assignments and extended shifts
- Willing to travel statewide and work in remote locations
- Physically capable of performing demanding mechanical work
- Experienced supporting public safety and emergency operations
- Strong adherence to safety standards and procedures
- Reliable, self-motivated, and able to work independently or within a team