maintenance... maintenance... maintenance... is what it is all about...
you have your ram rods / pedal to the metal and through the floor board folks.. never look back, just keep on going, and wait till something breaks before fixing it.
then ya have pre maintenance folks, that grease things, keep things cleaned after each use, when something begins to go. get things dealt with, before it causes a complete break down. let unit set a couple minutes before shutting down, along with waiting a couple minutes after start up to let things warm up. when bearings or like start to get bad, things are fixed vs waiting for a complete shearing of shaft and something falling off. keeping mower blades balanced / sharpened.
keeping the sun/ rain / snow off a unit can also make things last longer. the unit does not have to be placed in an actual shed, but a simple over hang, or something, to keep direct sun light / rain / snow from coming down on it. sub loves to bake rubber and like stuff causing dry root in tires, to hoses, to seat cushion cracking, to other. at same time, a tarp can do as much damage, keeping things "wet / high moisture under tarp" letting the wind blow through it and around it, can help dry things out, and help reduce rust.
oil changes, coolant changes / flushing (antifreeze/water mixture), repacking various bearings that rely on grease to keep lubricated. using correct type of grease in correct areas.
i use and abuse machinery, as in i will run stuff right into point pressure relief valves kick in for hydraulics, to getting every little bit last fraction of a MPH going through things. running finishing mower decks through tall stuff, and get the blades all tangled up with tall weeds and eating up a belt. lugging engine some pulling stuff. but before hand and after wards, i run the machine down of "pre maintenance / regular maintenance" checking for leaks, double check torque on bolts, etc...
it is the DIY'er and being half way mechanically inclined to be able to fix stuff on the tractor, even if it just means undoing some bolts, and replacing seals, and/or bearing, tracking down some electrical issue with a multi reader. that can go along ways in learning and keeping a tractor in shape long haul. sending it to dealer every time = rather expensive. and generally a shop/service manual for tractor. can help the dummies like myself, work through things and get things done with less effort.
having a dedicated person run the machine can help, and always asking them does something seem wrong with the unit? even if it is minor, example wife/hubby running a second machine to help mow, or get chores done around farm. or what not. or they run it, and you repair it thing...