Tractor Trailer Maintenance Schedule

Scheduled maintenance tasks to ensure tractor-trailer roadworthiness and efficiency. Complete DOT compliance and preventive maintenance guide for commercial vehicles.

Pre-Maintenance Safety & Preparation

  • Park tractor-trailer on level ground away from traffic with adequate workspace clearance.
  • Apply parking brake securely and place wheel chocks on drive axle wheels for safety.
  • Turn off engine, remove keys, and allow engine to cool completely before maintenance.
  • Disconnect battery if electrical work will be performed to prevent accidental starts.
  • Review vehicle maintenance history and service intervals from fleet management system.
  • Gather all required tools, fluids, filters, and replacement parts for efficient service.
  • Ensure proper PPE including safety glasses, gloves, and steel-toed boots are worn.
  • Inspect work area for hazards and ensure adequate lighting for detailed inspection work.
  • Verify OSHA compliance for raised vehicle work and use proper jack stands if lifting.
  • Document initial odometer reading and vehicle condition for maintenance records.

Engine & Powertrain Maintenance

  • Check engine oil level and condition, replace oil and filter per manufacturer schedule.
  • Inspect coolant system including radiator, hoses, clamps, and coolant condition and level.
  • Test cooling system pressure and thermostat operation for proper temperature control.
  • Check air intake system including air filter, turbocharger, and intercooler condition.
  • Inspect fuel system including filters, water separator, and fuel lines for leaks.
  • Test diesel exhaust fluid (DEF) system and replace filter as required by emissions standards.
  • Check transmission fluid level, condition, and filter replacement according to service interval.
  • Inspect drive belts for proper tension, cracking, fraying, or other wear indicators.
  • Test alternator charging system and inspect battery terminals for corrosion or damage.
  • Check power steering fluid level and inspect hydraulic system for leaks or damage.

Brake System Comprehensive Check

  • Test air brake system pressure build-up and check for proper 120-125 PSI operating pressure.
  • Inspect brake chambers, slack adjusters, and push rods for proper adjustment and operation.
  • Check brake linings and pads for wear indicators and minimum thickness requirements.
  • Examine brake drums and rotors for scoring, cracking, or heat damage requiring replacement.
  • Test parking brake application and holding capability with proper adjustment verification.
  • Inspect air lines, fittings, and connections for leaks or damage affecting system pressure.
  • Check ABS system operation and warning light function for proper safety system operation.
  • Test emergency brake valve (red button) for proper application and system isolation.
  • Verify trailer brake system connection and proper air supply to trailer brakes.
  • Document brake adjustment measurements and component condition for DOT compliance records.

Tire & Wheel System Inspection

  • Check tire pressure on all positions including spare tire using calibrated pressure gauge.
  • Inspect tire tread depth using gauge to ensure minimum 4/32" on steer axle, 2/32" on drive and trailer.
  • Look for irregular wear patterns indicating alignment, balance, or mechanical problems.
  • Check for cuts, punctures, bulges, or sidewall damage that could cause tire failure.
  • Inspect wheel nuts and bolts for proper torque specification and signs of loosening.
  • Examine rims for cracks, corrosion, or damage that could affect tire seating.
  • Verify valve stems and caps are in good condition without cracks or leaks.
  • Check tire matching on dual wheels to ensure similar tread depth and pressure.
  • Inspect tire chains and storage hardware for proper operation and security.
  • Document tire rotation schedule and replacement recommendations for fleet management.

Trailer Systems & Equipment

  • Inspect trailer frame, cross members, and structural components for cracks or damage.
  • Check landing gear operation, grease gear box, and inspect support feet condition.
  • Test fifth wheel coupling mechanism and inspect king pin for wear or damage.
  • Examine trailer doors, hinges, latches, and seals for proper operation and security.
  • Inspect cargo securement equipment including tie-downs, straps, and anchor points.
  • Check trailer suspension including leaf springs, air bags, and shock absorber condition.
  • Test refrigeration unit operation if equipped, including fuel, coolant, and belt condition.
  • Inspect trailer flooring for damage, wear, or contamination affecting cargo safety.
  • Check side protection and rear impact guard for DOT compliance and structural integrity.
  • Verify trailer identification numbers, placards, and required markings are legible and current.

Electrical & Lighting Systems

  • Test all exterior lights including headlights, taillights, and marker lights for proper operation.
  • Check turn signals, hazard lights, and backup alarm operation for safety compliance.
  • Inspect lighting wiring and connections for damage, corrosion, or loose connections.
  • Test trailer electrical connection including seven-way plug and pigtail condition.
  • Check instrument panel lights, gauges, and warning indicators for proper function.
  • Inspect battery hold-down, terminals, and cables for security and corrosion prevention.
  • Test starting system including starter motor operation and electrical connections.
  • Check auxiliary electrical equipment including GPS, communication devices, and refrigeration units.
  • Verify DOT lighting requirements are met including reflective tape and marker placement.
  • Document any electrical repairs or component replacements for maintenance history.

Post-Maintenance Documentation & Compliance

  • Complete detailed maintenance records including all work performed and parts used.
  • Update fleet management system with current mileage, hours, and service history.
  • Document any defects found and corrective actions taken for DOT compliance.
  • Schedule next maintenance interval based on mileage, hours, or time-based requirements.
  • File maintenance records according to FMCSA requirements for easy DOT inspection access.
  • Update vehicle inspection certification and ensure current DOT stickers are displayed.
  • Record technician qualifications and certifications for work performed verification.
  • Document any warranty work or recalls completed during maintenance service.
  • Prepare vehicle for return to service with proper authorization and safety verification.
  • Communicate any ongoing issues or upcoming maintenance needs to fleet management.
Use Checklist Online

Take Control of Heavy Vehicle Inspection and Maintenance in real time.

HVI Software for fleet management, including daily inspection checklists, preventive maintenance PM schedules, work order maintenance, safety management, and fuel optimization.

Schedule a demo or start your free trial right away.

Book a Tour Start a Free Trial Download App
report-summary
🚀 Start Free Trial 📅 Book a Demo

Get HVI App
Inspection And Maintenance Management Software

Download Our App