Lead Diesel Mechanic

**Company:** Diamond Concrete Supply, Inc.
**Pay:** $30.00–$40.00 per hour
**Job Type:** Full-Time
**Work Location:** In Person – Lakeside, CA 92040

About Us
Diamond Concrete Supply, Inc. is an established ready-mix concrete company with a busy fleet and a hands-on maintenance team. We take pride in keeping our trucks and equipment safe, reliable, and ready for work.

We are seeking an experienced, dependable, and skilled **Lead Diesel Mechanic** to join our Mechanics Team. The ideal candidate has strong mechanical and diagnostic skills, takes pride in quality workmanship, and can independently troubleshoot, maintain, and repair heavy-duty diesel trucks and equipment while helping coordinate daily maintenance operations.

Key Responsibilities
- Diagnose, maintain, and repair heavy-duty diesel mixer trucks, tractors, loaders, forklifts, and other company equipment.
- Troubleshoot and repair diesel engines, transmissions, brakes, steering, suspension, electrical and electronic systems, hydraulics, cooling systems, fuel systems, air conditioning, and emissions/aftertreatment systems.
- Use computerized diagnostic equipment to identify faults, determine root causes, and perform appropriate repairs.
- Perform scheduled preventative maintenance, routine inspections, major repairs, and component overhauls as needed.
- Inspect equipment for mechanical defects, wear, and safety concerns, and complete repairs consistent with applicable DOT, CHP, manufacturer, and workplace safety requirements.
- Evaluate, prioritize, and coordinate equipment repairs based on safety, operational needs, and vehicle downtime.
- Coordinate daily maintenance activities and communicate work priorities with other members of the Mechanics Team.
- Perform welding, fabrication, cutting, and mechanical adjustments as needed and when qualified.
- Conduct operational checks and authorized test drives to verify equipment performance after repairs.
- Troubleshoot complex mechanical issues and perform major repairs and rebuilds.
- Maintain accurate records of inspections, repairs, parts used, and maintenance performed.
- Communicate repair needs, equipment conditions, and the status of out-of-service vehicles to management and dispatch.
- Monitor parts inventory, identify needed supplies, and ensure parts and materials are properly stored and recorded.
- Maintain a clean, organized, and safe work area, including tools and equipment.
- Follow company safety procedures, report workplace hazards and incidents promptly, and participate in required safety meetings.
- Perform other related duties as assigned.

Required Qualifications
- Minimum of 3 years of professional experience in diesel truck or heavy equipment maintenance and repair.
- Strong knowledge of diesel engines and heavy-duty mechanical systems.
- Experience diagnosing and repairing mechanical, electrical, electronic, hydraulic, and pneumatic systems.
- Proficiency with computerized diagnostic equipment and troubleshooting procedures.
- Ability to read and interpret technical manuals, diagnostic reports, and equipment specifications.
- Experience performing preventative maintenance, inspections, and mechanical repairs.
- Ability to troubleshoot complex problems, identify appropriate repairs, and work with limited supervision.
- Ability to organize and prioritize maintenance tasks based on safety and operational needs.
- Ability to maintain accurate maintenance records and communicate repair findings effectively.
- Strong problem-solving skills, attention to detail, and commitment to safe work practices.
- Ability to work independently and collaboratively with a maintenance team.
- Ability to reliably report to the Lakeside, California work location.
- Ability to provide and maintain personal hand tools necessary for assigned work, consistent with applicable California law.

Preferred Qualifications
- Experience maintaining and repairing ready-mix concrete mixer trucks.
- Experience with Class 8 trucks, tractors, and heavy equipment.
- Familiarity with DOT/CHP vehicle inspections, air brake systems, and DVIR-related repairs.
- Experience with diesel emissions and aftertreatment systems.
- Welding and metal fabrication experience.
- ASE or other recognized diesel/heavy-duty mechanic certifications.
- CDL Class A or B is a plus but is not required.
- Previous experience coordinating maintenance activities or serving in a lead mechanic role.

Physical Requirements and Working Conditions
This position involves physically demanding work in an industrial maintenance environment. Essential functions may include:
- Frequently standing, walking, bending, kneeling, squatting, crouching, climbing, crawling, and working in restricted-access areas.
- Lifting and carrying tools, parts, and equipment weighing up to 50 pounds, with heavier items handled using appropriate assistance or lifting equipment.
- Working in various positions, including underneath vehicles and around heavy machinery.
- Using hand tools, power tools, pneumatic tools, and diagnostic equipment.
- Working indoors and outdoors in varying conditions, including heat, cold, dust, noise, and wet weather.
- Working around heavy equipment, moving vehicles, oils, lubricants, and other materials commonly encountered in a diesel maintenance shop.
Reasonable accommodations will be considered for qualified individuals with disabilities to perform the essential functions of the position.

Schedule
- Full-time, day shift
- Generally 8-hour shifts
- Overtime as needed
- Weekend work as needed
- Participation in an on-call rotation for equipment breakdowns or urgent repairs

Benefits
- 401(k) with Company match
- Health insurance
- Dental insurance
- Vision insurance
- Life insurance
- Paid time off
*Benefits are subject to applicable plan terms and eligibility requirements.*

Our Company Culture
**Detail-Oriented:** We value quality workmanship, accuracy, and attention to detail.
**Driven:** We value reliability, accountability, initiative, and continuous improvement.
**Team-Focused:** We work together to keep our trucks and equipment running safely and efficiently.
If you are an experienced Diesel Mechanic ready to take a lead role in maintaining a busy fleet, we encourage you to apply.

Equal Employment Opportunity
Diamond Concrete Supply, Inc. is an Equal Opportunity Employer. Qualified applicants will be considered for employment without regard to race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, national origin, ancestry, age, disability, medical condition, genetic information, marital status, military or veteran status, or any other characteristic protected by applicable law.
Qualified applicants with criminal histories will be considered in accordance with the California Fair Chance Act and other applicable laws.

Diamond Concrete Supply

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Lead Diesel Mechanic