DescriptionJOB SUMMARY The Master Mobile Mechanic combines advanced mechanical expertise with leadership responsibilities, ensuring the safe, efficient, and reliable operation of heavy mobile equipment, with a strong emphasis on high utility CAT and Komatsu earthmoving and aggregate equipment across multiple sites. You will diagnose complex issues, perform precision repairs, and mentor mechanics while driving continuous improvement in fleet performance.
As the Master Mobile Mechanic, you are expected to serve as a technical lead, supervising complex rebuilds, managing yellow iron health, and providing on-the-job mentorship to the maintenance team while ensuring 100% compliance with MSHA and Martin Marietta standards.
KEY DUTIES AND RESPONSIBILITIES - Perform expert-level troubleshooting on diesel engines, hydraulic systems, electrical circuits, and drivetrains for heavy mobile equipment (loaders, haul trucks, dozers, excavators).
- CAT maintenance: utilize OEM-specific software (such as CAT Electronic Technician and Komatsu KOMTRAX/Komatsu Care) to interpret fault codes, monitor machine health, and perform calibrations.
- Execute major component rebuilds, precision alignments, and fabrication tasks using advanced tools and diagnostic software.
- Interpret complex electrical and hydraulic schematics to repair sophisticated control systems.
- Lead root-cause analysis for recurring mechanical failures and implement corrective actions to prevent downtime.
- Conduct post-repair testing and calibration to ensure equipment meets manufacturer specifications and operational requirements before returning to production.
- Perform expert-level welding and structural fabrication (MIG, TIG, Stick, and Plasma cutting) to repair cracked frames, buckets, and truck beds.
- Use micrometers, calipers, and dial indicators to verify tolerances on shafts, bearings, and interference fits during rebuilds.
- Enforce MSHA and company safety protocols during all maintenance activities.
- Ensure proper documentation of lockout/tagout procedures and hazard assessments.
- Maintain accurate service records, diagnostic reports, and inventory logs.
- Assist in budgeting for parts, tools, and equipment upgrades.
- Collaborate with procurement teams to source high-quality components and reduce lead times.
- Serve as the technical lead for Mobile Mechanics, providing guidance, training, and performance feedback.
- Coordinate complex repair projects and ensure compliance with safety and quality standards.
- Function as a resource for supervisors and managers in planning maintenance strategies and capital projects.
QUALIFICATIONS Education
- Vocational training or equivalent experience
- Advanced technical certifications in diesel mechanics, hydraulics, or welding preferred.
Work Experience
- 4+ years Mobile Equipment Maintenance Experience
- CAT maintenance preferred
Knowledge, Skills, and Abilities
- Welding and metalworking skills
- Mechanical analysis
- Design tools
- Mechanical controls
- Troubleshooting
- MSHA compliance and regulations
- Critical thinking skills
- Detail orientated
- Time management
ADDITIONAL DETAILS Physical Requirements
- Must be able to lift and carry up to 50 lbs. for plant maintenance and equipment servicing.
- Required to bend, stoop, climb, and reach. You must be able to maintain three points of contact when climbing on/off machinery or on ladders.
- Strong hand-eye-foot coordination is essential for operating hand/foot controls. You must have good depth perception with or without seeing aid for distances up to 150 feet.
Working Conditions
- All duties require outside assignments and require periods of work in all weather conditions, cold, wet, dry and dusty. Must be able to work in areas where noise levels are up to 85 dbs.
Disclaimers
- In addition to the primary responsibilities outlined, the successful candidate may be expected to take on other tasks and assignments as required, including but not limited to duties outside the typical scope of the role to support overall team operations and organizational needs. Flexibility and adaptability to evolving job demands are essential.
COMPENSATIONThe hiring range for this position is
$38.00 - $65.00 exclusive of benefits or bonuses (discretionary and non-discretionary). The offered base compensation will be determined based on factors such as geographic location, business need, market conditions, proficiencies, skills, education, and experience. Additionally, at Martin Marietta we place a high value on internal pay equity and will consider the compensation for those in similarly situated roles and direct team members. The hiring range for this role represents the base compensation we expect to pay for the position at time of hire and does not represent the total possible base pay of the position. In addition to our base compensation, we also offer a competitive benefits package for full-time employees, including medical, dental and vision coverage; prescription drug coverage; health savings accounts; flexible spending accounts; life, AD&D and disability insurance; 401(k) with a company match and an employer-funded defined benefit pension plan. Other benefits include paid time off, paid holidays, education/tuition assistance, an employee discount program, adoption assistance, wellness programs and more.
Part time employees are eligible to participate in the 401k plan and receive a company match. In addition, they are eligible to start accruing service for the pension plan.
