Semi-Trailer Maintenance: How often should a semi-trailer be serviced?

Regular maintenance is critical to keeping your semi-trailer in safe, working condition. Whether you manage a fleet or operate a single unit, knowing how often your trailer needs to be serviced can help you avoid costly downtime, ensure compliance, and extend the life of your equipment. 

Let’s discuss how often a semi-trailer should be serviced, what systems to inspect, and how Great Western Trailer can help you stay ahead of issues with expert trailer service and inspections. 

So how often should you service a semi-trailer? The general rule of thumb is to service your semi-trailer every 3 to 6 months, depending on usage, road conditions, and the type of cargo you haul. 

Here’s a more detailed breakdown: 

Preventive Maintenance (Every 3 Months or 25,000 Miles) 

• Visual inspection of tires, brakes, suspension, and lights 
• Lubrication of moving parts (landing gear, hinges, etc.) 
• Air system inspection and adjustment 
• Torque check on wheel fasteners 
• Fluid levels check (where applicable) 

Thorough Inspection (Every 6 Months or 50,000 Miles) 

• Brake lining measurement and adjustment 
• Complete electrical system testing 
• Suspension and axle alignment check 
• Frame and structure integrity check 
• Inspection of seals, doors, and flooring 

Keep in mind that the FHWA (Federal Highway Administration) requires a yearly inspection of all commercial trailers with a GVWR of 10,001 pounds (about 4536.37 kg) or more. This includes a comprehensive review of all major safety systems to ensure DOT compliance. Not only is this mandatory under FMCSA regulations—it’s a vital part of keeping your trailer legally on the road. 

Keeping a maintenance log is also recommended to track service dates, repairs, and inspections for DOT compliance and resale value. Here’s a quick checklist of critical systems that should be evaluated during regular trailer service: 

• Brakes and air systems 
• Suspension and axles 
• Tires, wheels, and hubs 
• Electrical systems and lighting 
• Trailer frame, undercarriage, and flooring 
• Doors, hinges, seals, and latches 
• Landing gear and crank systems 

At Great Western Trailer, we provide complete trailer maintenance and inspections across all our locations. Whether you need a basic check-up, an FHWA inspection, or a full-service repair, our expert technicians will help keep your equipment road ready. 

Don’t wait for a breakdown to service your trailer—schedule regular maintenance and stay ahead of costly downtime. Visit the LOCATIONS tab on our website to schedule your next service appointment today.