How to Build a Truck Preventive Maintenance Schedule

Federal rules require a schedule and leave the intervals to you. Under 49 CFR 396.3, a motor carrier must systematically inspect, repair, and maintain every truck it controls, and for each truck controlled 30 consecutive days or more, keep a record with “a means to indicate the nature and due date” of each inspection and maintenance operation, plus the date and nature of the work done. Beyond the driver’s daily inspection, the only fixed interval Part 396 sets for a dump truck is the periodic inspection, passed within the preceding 12 months. The rest come from the engine, brake, and body manuals.

Engine hours or miles

Engine makers publish each service as a mileage, an hour count, and a time limit, due at whichever comes first. A Cummins X15 in severe duty, 3 to 4.9 mpg, gets its oil and filter at 25,000 miles, 500 hours, or 12 months. A Detroit DD13 or DD15 in severe service, meaning under 5.0 mpg, up to 30,000 miles a year, or severe conditions, gets it at 35,000 miles, 750 hours, or 6 months. Divided out, both tables assume about 47 to 50 miles per engine hour.

A short-haul dump truck can run well below that. Every hour idling in the pit, in the scale line, or at the paving site adds engine hours without miles. Cummins tells X12 owners to drop one duty-cycle band when idle and PTO time together pass 40%. Schedule on engine hours, read from the hour meter or from the engine computer through telematics, and keep miles and months as caps. A schedule kept on miles alone runs the oil past its hour limit on every truck that idles a lot.

Check the guide for each truck’s engine: Cummins’ 2017 X15 guide set severe duty below 5.5 mpg with a 6-month limit, and the 2025 revision uses 3 to 4.9 mpg and 12 months.

Five trucks on a paving job

These numbers are an illustration; replace them with yours. Five tri-axles on a paving job each run 5 loads a day on a 12-mile haul: 120 miles of round trips plus 30 miles to and from the yard, 150 miles a day. The engine runs 10 hours a day, 4 of them idling at the plant and the job site, which is 15 miles per engine hour.

On a Cummins X15 in severe duty, each truck reaches 500 hours after 50 working days and 7,500 miles. A schedule built on the 25,000-mile figure would call the oil change after about 167 working days, when the engine has run close to 1,670 hours, more than 3 times its hour limit. Kept on hours and staggered, the schedule brings one of the 5 trucks in for oil every 2 weeks, and the 12-month cap never comes into play.

Hoist grease runs on cycles. Crysteel’s telescopic hoist manual calls for greasing every fitting every 100 cycles or every 2 months, so at one raise of the body per load these trucks reach 100 cycles in 20 working days.

Service levels

Nest the services so each level includes everything below it. The shop plans 4 kinds of visit, and a truck in for its B service gets its A items the same day. The intervals are severe-duty figures from the makers’ tables; use the ones for your own engines and bodies.

• Every shift | Walk-around of brakes, air lines, tires, wheels, lights, steering, mirrors, wipers, hoist, and tailgate latches | Driver | Written report only for a defect, repaired or certified before the truck runs again, kept 3 months
• Every 100 loads or 2 months | Grease the rear hinge, hoist cylinder pivots, body prop, and tailgate pivots and latches | Driver or shop technician | Date and load count on the work order
• A: 250 engine hours or 1 month | Pushrod stroke on every brake (engine off, 80 to 90 psi, brakes fully applied), slack adjusters checked and greased, air tanks drained, tire pressure and tread depth (4/32 inch minimum on the steer axle, 2/32 inch elsewhere), air filter restriction indicator, chassis grease | Shop technician; brake work by a qualified brake inspector | Work order with the date, engine hours, miles, and work done
• B: 500 engine hours on a Cummins X15, 750 on a Detroit DD13 or DD15, or the maker’s mileage or months limit | A items plus oil and filter, fuel filters, oil sample, coolant additive check | Shop technician | Work order and oil analysis report
• C: every 12 months | B items plus the annual inspection of every system in Appendix A to Part 396, and a new air dryer cartridge | Qualified inspector | Inspector’s report kept 14 months where the truck is housed or maintained, with the report or a decal on the truck
• D: by engine hours over the life of the truck | Cummins X15 figures: DEF filter at 6,750 hours, coolant flush at 6,000 hours or 48 months, overhead adjustment at 10,000 hours or 60 months, DPF ash cleaning when the ash-load monitor calls for it | Shop or dealer | Work order with the hour reading

Bendix puts heavy-duty and off-road vocations in its high air use class, with tanks drained every 300 hours or monthly and a new dryer cartridge every 12 months. For a truck’s first year on a new duty cycle, pull an oil sample at every B service. Detroit recommends oil analysis to validate every drain interval, and the results show whether your trucks need a shorter interval than the published one.

Brakes and roadside inspections

During CVSA’s 2025 Brake Safety Week, inspectors placed 2,296 of 15,175 vehicles out of service for brake violations, 15.1%, and the most common reason, cited 1,199 times, was 20% or more of the service brakes defective. Air-braked trucks built on or after October 20, 1994, must have automatic brake adjusters, and Bendix warns against adjusting automatic slack adjusters by hand to correct excess pushrod stroke, because a long stroke means the foundation brake or the adjuster needs inspection. When the A service finds a stroke past the limit, write it up as a brake repair and find the cause.

Roadside brake, light, tire, and other mechanical defects, along with failures to make required repairs, count in the Vehicle Maintenance BASIC of FMCSA’s Safety Measurement System. FMCSA has finalized a split of that category: defects a driver could reasonably see, or that a walk-around inspection would find, move to a new Vehicle Maintenance: Driver Observed category with the same intervention thresholds. As of September 2026, FMCSA lists the new method as still in revision. Once it launches, the defects your drivers should catch on the walk-around get a percentile of their own.

Records

The record identifies each truck by company number, make, serial number, and year, and names the owner when you do not own it; since July 21, 2026, it no longer has to list tire size. Keep it where the truck is housed or maintained for 1 year, and for 6 months after the truck leaves your control. A third-party hauler’s truck that you control for 30 consecutive days or more goes in your file.

Put the engine-hour reading on every work order. The rule asks for a due date, and an hours-based schedule needs the hour history to give one: a truck logging 50 hours a week that is 200 hours short of its B service is due in about 4 weeks. Keep that date on the due list, and move it when the truck changes to a job with more or less idle.