Those are good tractors in my opinion. They are expensive though, so fixing anything on them is also going to seem expensive. They aren’t nearly old enough yet to fix with recycled parts. I think if you can put a bit of an oversized model on your job, repairs would be kept to a minimum.
Since they have been one of the largest tractor platforms available for a while, a lot of them have been put on heavy draft jobs. The one I’ve driven for six years has pulled a considerable percentage harder than it was intended for, so it has had some money put into it. The largest single expense was about 1/16th of what the list price is on a new one.
This one has over 4000 engine hours but the front tracks were moved to the rear and vice versa at about 3500 engine hours. It’s ballasted very heavy so there isn’t much wear on the tread at all. You loosen the tracks and remove the outer idlers at each end and take the track off the undercarriage. Stubble wear at the intersection of the lugs on the front tracks creates a crevice in the rubber. The front ones also operate in much more heat and radiation from the engine.
On this particular one, I think that rotation was done a little ahead of the tracks actual half life. I wasn’t there, but I think they used a tech, two helpers, jacks and blocks and a loader with a fork attachment, I don’t know how much time.