A preventive maintenance checklist for semi trucks
Preventive maintenance is the cheapest work you will ever do on a truck, because it replaces a roadside breakdown with a planned stop. Federal rules require it, and the trucks that get it run more miles between repairs. Here is what a real PM covers and how to keep it on record.
What the rules require
Under 49 CFR 396.3, every carrier has to systematically inspect, repair, and maintain its trucks, and keep records that show it. Systematically is the key word. A pile of receipts is not a program. A schedule with dates and due items is.
Engine, fluids, and the basics
Start where neglect costs the most. Oil and filters on schedule, coolant and DEF at the right level and condition, and a look at belts, hoses, and any leaks under the truck. Setting the right oil change interval is the backbone of this part.
Brakes, tires, and steering
These are the safety items an inspector checks first. Brake condition and slack adjuster travel, tire tread and pressure across every position, and play in the steering and suspension. Rotating tires on schedule and replacing them by position keeps this part cheap.
Electrical and lights
A dead battery or a bad light strands you or fails you at a scan. Check the battery and charging system, the connections, and every required lamp. Our note on battery and electrical service covers what tends to go.
A PM checklist you can run
- Oil and filters per the engine's schedule
- Coolant, DEF, and other fluids topped and clean
- Belts and hoses for wear and cracks
- Brakes and slack adjuster travel
- Tires: tread depth, pressure, and wear pattern
- Steering and suspension play
- Battery, charging, and all required lights
- Any leaks under the truck
Keep the paperwork
The work only counts if you can show it. Keep your driver vehicle inspection reports, your PM records, and the dates. It keeps you compliant, it protects resale value, and it makes the next inspection short. We run the PM and hold the records for you. You can see the service on our truck maintenance services page.
FAQ
What is included in a semi PM service?
Fluids, brakes, tires, steering, and electrical, plus the records that prove the work was done.
How often should a truck get preventive maintenance?
By your miles and hours. Many fleets run tiered A, B, and C services at set intervals.
Is preventive maintenance required by law?
Yes. Federal rules require systematic maintenance and records for every truck a carrier controls.
Does preventive maintenance actually save money?
Yes. Fewer breakdowns, more miles between repairs, and small fixes caught before they become big ones.
If you want a PM schedule you can count on, call Royal Truck Repair near Allentown at (610) 841-2521 and we will build one around your truck and keep the records.