Kevin,
I like this question. We have systems in place to help the PM side of our business be profitable. Such as:
*Every customer machine has a unit number. All machines are listed in our "PM Book" with the necessary filters.
*We build filter packs and thoroughly tape them together and note the customer name and unit number.
*We hope to complete a typical IC 5000# capacity truck in 30-40 minutes. Plus travel time. This involves some commitment of the tech. Our initial PM takes longer, we service the battery and install high quality battery washers beneath the terminals. We document on the valve cover the drain pan plug size and how many quarts it took to fill with a paint stick. Such as 17/4
*The system is
Block it (beneath mast)
Jack it
Grease it
Blow it
Drain it
Check it
Fill it
Get another:)
We make our hour meter notes on a cardboard filter lid and also note " deficiencies". All of which is written up after all the PMs are complete. We try not to handle any repairs during the PM, but if the secondary lift chains need to be adjusted or a headlamp bulbinstalled we charge this time out. Yes- I'm considered **** on this subject!