Senior Plant Maintenance Mechanic

Martin Marietta; Corona (CA); On-site; USD 40,000 - 50,000; Full time

Benefits offered by this job

401(k) match

Health insurance

Dental & Vision

Job summary

Martin Marietta is seeking a Senior Plant Maintenance Technician to lead reliability and safety in plant equipment. You will troubleshoot, repair, and mentor junior technicians while driving preventive maintenance programs and SOPs.

Your work will support uptime, quality, and production across conveyors, pumps, gearboxes, and related systems. The role requires 3+ years in heavy-duty maintenance, MSHA compliance, and strong communication skills.

Qualifications

• Experience assessing and repairing plant equipment.
• Ability to troubleshoot complex maintenance issues.
• Strong focus on safety, quality, and production.

Responsibilities

• Evaluate equipment to improve availability, capability, and yield.
• Lead maintenance initiatives and coordinate with vendors for support.
• Document maintenance activities and maintain records per standards.

Skills

Equipment analysis

Troubleshooting

Critical thinking

Problem solving

Detail oriented

Time management

MSHA compliance

Effective communicator

Education

High school diploma/GED

Job description

JOB SUMMARY

The Senior Plant Maintenance Technician is a key technical leader responsible for ensuring the reliability, safety, and efficiency of plant equipment and systems. This includes stationary and mechanical systems such as conveyors, shakers, pumps, and gearboxes, as well as general facility maintenance involving electrical, plumbing, and basic structural systems. This role goes beyond routine maintenance—providing advanced troubleshooting, repair expertise, and mentoring for junior technicians. The role drives preventive maintenance programs, develops SOPs, and champions MSHA compliant practices to maximize equipment uptime and plant safety, quality, and production. The Senior Plant Maintenance Technician optimizes production performance and supports continuous improvement initiatives.

KEY DUTIES AND RESPONSIBILITIES

• Performs evaluations of plant equipment seeking opportunities to improve availability, capability, and yield.
• Studies trends to identify systemic plant maintenance needs.
• Actively participates in broad-scale plant maintenance initiatives.
• Works with vendors to procure plant maintenance support.
• Develops reports on plant capacity and yield and related plant maintenance activities.
• Maintains appropriate plant maintenance records of information and data in respective technological systems.
• Conducts MSHA pre-shift safety inspections of equipment and work areas.
• Prioritizes SAFETY first, followed by QUALITY and PRODUCTION.
• Maximizes performance of stationary equipment by performing timely repairs and completing preventive maintenance according to the Maintenance Module.
• Checks, repairs, and replaces pumps, conveyors, gearboxes, and screens to minimize downtime.
• Operates cranes, man‑lifts, welding and cutting tools, and other specialty equipment as needed.
• Performs fabrication, erection, and repair of processing and mobile equipment.
• Ensures maintenance backlog is reviewed and prioritized with the Supervisor and/or Plant Manager.
• Completes all required paperwork to maintain equipment in compliance with Martin Marietta standards.
• Trains and coaches other employees on maintenance best practices.
• 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.

QUALIFICATIONS

Education

High school diploma, GED, or equivalent experience

Work Experience

3+ years of related experience in Heavy‑Duty Maintenance or related field, preferably in the Aggregates Industry.

Knowledge, Skills, and Abilities

• Equipment analysis and general repair concepts
• Troubleshooting
• Critical thinking
• Problem solving
• Detail oriented
• Time management
• MSHA compliance and regulation
• Effective communicator (written and spoken)

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.

The hiring range for this position is $40 -$50 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.