POSITION SUMMARY

The Heavy Truck Diesel Mechanic inspects, diagnoses, services, repairs, and maintains company-owned heavy trucks, tractors, trailers, and related fleet equipment to support safe, dependable field operations. The position performs preventive maintenance, mechanical and electrical diagnostics, component repair and replacement, inspection support, road-service response, and accurate work-order documentation while controlling cost, downtime, and repeat failures.

Working under the direction of the Trucking Operations leadership, the Mechanic services equipment used in oil and gas, environmental, safety, transportation, and industrial operations. The employee must use sound diagnostic practices, follow manufacturer and company procedures, maintain a safe and orderly work area, and remove equipment from service when a condition could endanger the driver, public, customer, or company property.

ESSENTIAL DUTIES AND RESPONSIBILITIES

Diagnostics and Troubleshooting

• Receive and verify driver complaints, inspection findings, fault codes, warning indicators, performance concerns, and prior repair history before beginning diagnosis.
• Diagnose mechanical, electrical, electronic, hydraulic, pneumatic, fuel, cooling, lubrication, air-intake, exhaust, and aftertreatment system concerns using systematic testing methods.
• Use approved scan tools, diagnostic software, digital multimeters, pressure and vacuum gauges, battery and charging-system testers, thermal tools, service information, wiring diagrams, and technical specifications.
• Perform visual and operational inspections, retrieve and interpret diagnostic trouble codes, review live data, conduct pinpoint tests, and confirm the root cause before replacing components.
• Distinguish active failures from historical codes, secondary symptoms, maintenance needs, operator concerns, and conditions requiring specialized vendor or dealer support.
• Verify completed repairs through inspection, testing, road testing when authorized, and confirmation that leaks, fault codes, warning indicators, and reported symptoms have been resolved.

Preventive Maintenance and Inspections

• Perform scheduled preventive maintenance based on mileage, engine hours, time intervals, equipment use, manufacturer guidance, and company maintenance standards.
• Inspect engines, transmissions, clutches, driveline components, differentials, steering, suspension, brakes, wheel ends, tires, frames, couplings, fifth wheels, electrical systems, lighting, and safety equipment.
• Change engine oil, filters, fuel filters, air filters, coolant, transmission or axle fluids, and other service items using approved products and procedures.
• Lubricate chassis, driveline, suspension, steering, fifth-wheel, liftgate, trailer, and other designated points and inspect for wear, looseness, contamination, and damage.
• Check batteries, charging and starting systems, belts, hoses, clamps, fluids, leaks, tire pressure and condition, brake adjustment, air-system operation, and required safety components.
• Identify conditions affecting safe operation or inspection readiness and communicate out-of-service recommendations to Fleet management promptly.

Heavy Truck and Trailer Repair

• Repair or replace engines and external components, cooling-system parts, fuel-system components, starters, alternators, batteries, belts, hoses, sensors, wiring, connectors, relays, switches, and lighting.
• Diagnose and repair air-brake components, foundation brakes, air lines, valves, chambers, slack adjusters, drums, rotors, hubs, bearings, seals, and related systems within individual qualification.
• Service steering and suspension components, springs, shocks, bushings, torque rods, tie rods, steering gears, kingpins, wheel ends, tires, and alignment-related components as assigned.
• Repair driveline, clutch, transmission, differential, power-takeoff, hydraulic, air, and auxiliary equipment systems within available tools, training, and authorization.
• Diagnose diesel exhaust fluid, diesel particulate filter, selective catalytic reduction, exhaust-gas recirculation, sensor, wiring, and other emissions or aftertreatment concerns using approved procedures.
• Inspect and repair trailers, landing gear, doors, floors, frames, suspension, brakes, wheel ends, lights, wiring, air lines, mud flaps, underride protection, and coupling components.
• Perform welding, cutting, fabrication, tire service, air-conditioning service, or other specialized work only when trained, qualified, properly equipped, and authorized.

Specialized Fleet Equipment Support

• Inspect and service fleet-mounted pumps, compressors, generators, hydraulic systems, power-takeoff units, hose reels, tanks, vacuum components, safety-service equipment, and other auxiliary systems as assigned.
• Coordinate with equipment operators and department representatives to understand operating complaints, equipment configuration, job demands, and required return-to-service timing.
• Identify repairs requiring specialized tooling, certifications, engineering information, warranty authorization, dealer support, or outside vendors and escalate them promptly.
• Protect mounted equipment, controls, calibration-sensitive devices, customer-specific components, and stored tools while performing vehicle repairs.
• Confirm guards, covers, fasteners, hoses, wiring, labels, emergency stops, and safety devices are restored before releasing equipment.

Road Service and Field Repairs

• Respond to authorized breakdowns, no-starts, warning lights, air leaks, tire concerns, overheating, charging failures, derates, and other service calls at yards, customer locations, roadsides, or remote field sites.
• Gather location, vehicle, load, traffic, terrain, weather, and failure information before travel and determine the tools, parts, support, towing, or recovery resources likely to be needed.
• Establish a safe work zone using warning lights, high-visibility clothing, cones, barriers, wheel chocks, spotters, and traffic controls appropriate to the location.
• Perform only repairs that can be completed safely and reliably in field conditions; arrange towing, recovery, vendor support, or equipment substitution when shop repair is required.
• Communicate status, repair limitations, estimated downtime, parts needs, and release conditions to Fleet management and the affected department.

Parts Tools and Shop Operations

• Identify and request correct parts using vehicle identification, unit number, component information, measurements, service literature, and approved vendor resources.
• Inspect received parts for correct application, quantity, condition, and compatibility before installation and protect warranty cores and returnable components.
• Maintain assigned hand tools, power tools, diagnostic equipment, lifts, jacks, stands, cranes, presses, welders, shop equipment, and service vehicles in safe working condition.
• Use appropriate lifting points, rated stands, wheel chocks, lockout controls, cribbing, and lifting equipment and never work beneath unsupported vehicles, cabs, bodies, trailers, or components.
• Maintain clean work bays, aisles, storage areas, service vehicles, and parts areas and promptly clean spills, trip hazards, scrap, and discarded materials.
• Safeguard company parts, fuel, tools, equipment, keys, purchasing information, and vendor accounts and report loss, damage, misuse, or inventory concerns.

Work Orders and Maintenance Records

• Open, update, and close work orders with complete complaint, cause, correction, labor, parts, mileage, engine hours, inspection findings, and testing information.
• Document diagnostic steps, measurements, fault codes, repair recommendations, deferred items, out-of-service conditions, vendor work, warranty information, and required follow-up.
• Record preventive-maintenance services and inspection results accurately so Fleet records reflect the actual condition and maintenance history of each unit.
• Notify supervision before expanding a repair beyond the approved scope, replacing high-cost components, sending equipment to a vendor, or returning a unit with unresolved concerns.
• Communicate clearly with drivers regarding reported symptoms and completed repairs without instructing them to operate equipment that has not been formally released.

Safety and Environmental Responsibilities

• Follow company and shop safety procedures, personal protective equipment requirements, equipment operating instructions, energy-control practices, and stop-work expectations.
• Recognize hazards involving raised vehicles, stored air or hydraulic pressure, batteries, electricity, hot components, rotating parts, springs, tires, refrigerants, fuels, exhaust, welding, chemicals, and heavy lifting.
• Depressurize, disconnect, isolate, block, support, or otherwise control hazardous energy before servicing affected systems and verify the condition before work begins.
• Use ventilation and exhaust extraction when operating engines indoors and avoid unnecessary idling or exposure to diesel exhaust.
• Store, label, handle, and dispose of used oil, coolant, filters, batteries, tires, solvents, refrigerants, absorbents, and contaminated materials according to company requirements.
• Immediately report injuries, near misses, spills, fires, equipment damage, defective shop equipment, unsafe vehicles, and significant hazards.

MINIMUM QUALIFICATIONS

• High school diploma or GED required; diesel technology, automotive technology, technical-school, apprenticeship, or military maintenance training is preferred.
• Two or more years of hands-on diesel, heavy truck, trailer, equipment, fleet, or comparable mechanical experience; equivalent formal training may be considered.
• Working knowledge of diesel engines, electrical systems, air brakes, steering, suspension, driveline components, cooling systems, preventive maintenance, and shop safety.
• Ability to use diagnostic software, scan tools, meters, gauges, service information, wiring diagrams, torque specifications, measuring tools, hand tools, and power tools.
• Ability to read and follow repair procedures, technical service information, inspection criteria, parts information, safety data sheets, labels, and work orders.
• Ability to perform basic calculations and accurately document labor, parts, measurements, fluid quantities, mileage, engine hours, and repair findings.
• Valid driver's license with an acceptable driving record consistent with company requirements.
• Ability to complete company-required training, medical evaluation, respiratory fit testing, and customer or facility access requirements when applicable.

PREFERRED QUALIFICATIONS

• Four or more years of heavy truck, diesel, trailer, fleet, or oilfield-equipment maintenance experience.
• ASE Medium Heavy Truck certifications, manufacturer training, air-conditioning certification, commercial driver's license, or recognized brake-inspector qualification, as applicable to assigned duties.
• Experience with electronic diesel engines, multiplexed electrical systems, air brakes, diesel aftertreatment, Allison or manual transmissions, hydraulic systems, and fleet-management software.
• Experience maintaining tractors, vocational trucks, service units, trailers, vacuum equipment, pumps, compressors, generators, or comparable oilfield fleet equipment.
• Current first aid and CPR, defensive-driving, forklift, aerial-lift, rigging, welding, lockout or tagout, or other job-relevant training.

KNOWLEDGE SKILLS AND ABILITIES

• Diagnose faults methodically and avoid unnecessary parts replacement by confirming the complaint, testing the system, identifying the cause, and verifying the repair.
• Prioritize safety-critical repairs, breakdowns, preventive maintenance, inspections, scheduled work, parts availability, and operational needs with guidance from Fleet management.
• Recognize when a vehicle or component is unsafe to operate and communicate the condition clearly without compromising required repair standards.
• Work independently while requesting technical support, authorization, additional equipment, or vendor assistance when a repair exceeds individual capability or available resources.
• Communicate professionally with drivers, supervisors, vendors, parts suppliers, and department representatives and provide realistic status updates.
• Demonstrate dependable attendance, attention to detail, mechanical judgment, organization, productivity, teamwork, and care of company property.

PHYSICAL AND WORK ENVIRONMENT REQUIREMENTS

This position performs work in maintenance shops, yards, roadsides, customer facilities, industrial sites, and remote field locations throughout the company's service territory.

• Frequently stand, walk, bend, stoop, kneel, crouch, crawl, climb, reach overhead, twist, push, pull, grip, and perform repetitive hand and arm movements for extended periods.
• Frequently lift or carry up to approximately 50 pounds and use team lifting or mechanical assistance for heavier batteries, tires, brake components, driveline parts, tools, and equipment.
• Work beneath, beside, inside, and on top of trucks and trailers while using ladders, creepers, lifts, jacks, stands, platforms, and access steps.
• Work around noise, vibration, diesel exhaust, oils, fuels, coolants, solvents, refrigerants, battery acid, dust, welding fumes, hot surfaces, sharp edges, and moving equipment.
• Work indoors and outdoors in heat, cold, wind, rain, dust, and changing weather while wearing required personal protective equipment.
• Drive to service locations and work early mornings, extended shifts, nights, weekends, holidays, on-call periods, and emergency breakdowns as business needs require.

SUPERVISORY RESPONSIBILITIES

This position has no supervisory responsibilities. The Heavy Truck Diesel Mechanic may provide task-specific guidance to helpers, drivers, or less-experienced technicians but does not manage employees unless formally designated.

DISCLAIMER

This job description summarizes the position's general duties and requirements and is not exhaustive. Management may modify duties or assign additional responsibilities to meet business, legal, safety, customer, and operational needs. Employment remains subject to applicable company policies and requirements.

Standard Safety & Supply is an Equal Opportunity Employer.