tractor rollover

I assume that you have asked about when hour wise maint. is to be preformed as a schedule? after the first maint. at 25 to 50 hrs. of clock time I try to do every 200 after unless something needs to be adressed before time. as a coolant leak and I have to drain the system then do it early just write it down so maybe it can be skipped on the next service. If this is not what you are asking please give more detail as to what your question is.