well chris
every mfg has thier own maintenance checks and methods they use
such as like cat
thier maintenance for thier model DP150 for instance
they have several intervals for different things to be done like
* Daily Prestart inspecton
*Every 50hrs or weekly
*Every 200hrs or monthly
*Every 1200hrs or 6months
*Every 2400hrs or yearly
and each one of those covers specific items to check or service. The daily one is just normal things such as fluid levels and visual inspections etc, as the schedule increases to longer hour intervals the list gets alot more extensive on what to service or check.
If you check across all the mfg's you'll see the same pattern as above but some differences. But generally a normal oil and filter change ,chassis lube and operation check happens about on the 200hr or monthly scale.