Where PM C fits
A tiered program spreads maintenance across visits. PM A is light and frequent, PM B adds more, and PM C is the deepest service, often done once a year or at a long mileage or hour interval. Some programs add more levels, and some use names other than letters. The checklist in the fleet program is what counts. See PM service.
Items a PM C often adds
Depending on the maker schedule and the fleet program, a PM C may add:
- Transmission and axle fluid changes where they are due.
- Cooling system service, such as coolant replacement where scheduled.
- Valve adjustment or other engine services the maker schedules at long intervals.
- A full inspection of the frame, cab mounts, exhaust and aftertreatment components.
- Detailed brake work, such as checking drums or rotors and hardware at every position.
- Air system checks, including air dryer service.
Why it matters
Long-interval services are easy to miss because they come up rarely. Missing one can lead to an expensive failure and an unplanned stop for the fleet. Under 49 CFR 396.3, carriers must keep a means to indicate the nature and due date of the various inspection and maintenance operations to be performed. Tracking PM C due dates by unit is part of meeting that duty.
Shop considerations
PM C takes the most time and the most parts, so plan it as a scheduled job rather than a walk-in. Confirm the parts list with the fleet before the truck arrives, order anything not in stock, and book the bay or service truck for the full time. Record every item, measurement and part on the work order, and turn defects found into separate repair lines for approval.
Example only
As an illustration, a fleet could set PM C at a yearly interval and line it up with the annual inspection. The right interval comes from the fleet and the equipment maker.
Related: PM A service, PM B service, preventive maintenance interval.
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