For ag equipment I remember hearing the figure 300 hours was a good deal of field use. I usually put around 125 hours on some tractors each year. That's the 4440, 8430, and 886(IH). These would be the ones you would see parked more in the winter. The 4020 is more like 150 and the 7800 is more like 150. They do more chores. I am starting to use the 4020 less and have replaced lots of its jobs with the 886 IH. It isn't handy to do things like dig post holes with a cab so the 4020 gets its exercise for things like that. The 7800 is digital but all others are cable driven so I assume they register PTO hours.
All of the tractors get an oil change once a year. The 4020 has 24,000 hours on one rebuild. It only uses oil when it is time for service. Literally it seems to know the date. The 4440 has 9500 hours on the original engine turned up to about 150 hp and uses no oil. The 8430 has 11,000 hours and about 2,000 on a rebuild and uses no oil. The 7800 has just under 8,000 hours with no rebuild and no fluid usage. The 886 has 3100 pampered hours so it uses no fluids.
My benchmark is higher than others. I don't expect any of my diesels to show age until 10,000 hours at the earliest. I don't see my 4440 showing any wear so I could easily see it going 14,000 hours on the original engine.
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