Lead Diesel Mechanic / Fleet Maintenance Supervisor – Semi Trucks & Tanker Trailers | $35–$50/hr

Lead Diesel Mechanic / Fleet Maintenance Supervisor LASER OILFIELD SERVICES — GREELEY / KERSEY, COLORADO $35–$50 PER HOUR | FULL-TIME | PERMANENT POSITION WE'RE LOOKING FOR THE BEST IN THE BUSINESS. Laser Oilfield Services is seeking an exceptionally qualified, highly certified Lead Diesel Mechanic / Fleet Maintenance Supervisor to oversee the maintenance, diagnostics, and repairs of our diversified commercial trucking fleet. Our operation includes: Class 8 Semi-Trucks — Heavy-duty diesel tractors and commercial trucks. Crude Oil & Liquid Tanker Trailers — Tankers, pumps, valves, braking systems, and associated components. Belly Dump & Side Dump Trailers — Hydraulic systems, suspension, brakes, and mechanical components. Heavy Haul & Lowboy Trailers — Heavy-duty axles, suspensions, braking systems, and specialized hauling equipment. Step Deck & Flatbed Trailers — Structural components, electrical systems, brakes, and trailer maintenance. Light-Duty Vehicles — Diesel and gasoline pickups and company service vehicles. Heavy Equipment — Occasional maintenance and repairs on construction and earthmoving equipment. This is not an entry-level position. We need a technician with exceptional diagnostic capabilities, extensive industry certifications, and the experience necessary to manage fleet maintenance independently. We are looking for someone who can identify the actual cause of a problem, complete repairs correctly the first time, and keep our equipment operating safely and efficiently. REQUIRED EXPERIENCE & CERTIFICATIONS All applicants must meet the following requirements: Minimum 10 years of verifiable professional mechanical experience, including extensive Class 8 diesel truck and commercial trailer experience. Current ASE Master Medium/Heavy Truck Technician certification (T2–T8). Current ASE L2 Electronic Diesel Engine Diagnosis Specialist certification. Current ASE Automobile certification in at least one relevant light-duty vehicle system. Documented OEM technical training or certification from Cummins, PACCAR, Kenworth, Peterbilt, Caterpillar, or another major commercial truck manufacturer. Documented DOT annual commercial vehicle inspector qualifications under 49 CFR 396.19. Documented commercial vehicle brake inspector qualifications under 49 CFR 396.25. DOT cargo-tank Registered Inspector qualifications applicable to regulated cargo-tank inspections and testing. Current EPA Section 609 certification. Valid CDL Class A. Documented heavy-equipment hydraulic and electronic diagnostic training. Extensive experience with semi-truck engines, transmissions, drivetrains, cooling systems, air brakes, suspensions, and emissions systems. Proven ability to diagnose and repair complex electrical and electronic issues using professional diagnostic equipment. Experience maintaining and repairing tanker, belly dump, side dump, flatbed, step deck, lowboy, and heavy-haul trailer systems. Demonstrated ability to maintain diesel and gasoline-powered pickups and light-duty vehicles. Proven leadership or fleet maintenance supervisory experience. Strong organizational skills, attention to detail, and commitment to safety and accountability. All required certifications and qualifications must be current, applicable, and verifiable. PRIMARY RESPONSIBILITIES Diagnose, troubleshoot, maintain, and repair commercial semi-trucks and trailers. Perform advanced diesel engine, electrical, drivetrain, and emissions diagnostics. Inspect and maintain commercial trailer braking systems, suspensions, wheel ends, lighting, and structural components. Troubleshoot hydraulic and mechanical systems on belly dumps, side dumps, and specialized trailers. Maintain tanker trailer pumping and mechanical systems. Perform preventive maintenance and appropriate DOT inspections. Repair and maintain company pickups and service vehicles. Troubleshoot and repair heavy equipment as needed. Develop and manage preve…

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