I have a JD 425 all wheel steer with a 60" deck with 755 hours since new. I have not had even ONE problem with it (not even a deck belt) but am wondering how many hours I can expect before my engine and hydrostatic transmission start showing problems. I mow 7 acres each week and pull another 42" mower beside me. I love my JD and will trade for another 425 if I can find one with low hours. I'm not happy with the new series JD AWS becuz you sit so much higher and I can't reach the ground from the seat to pluck the very few dandelion puff-seek-balls that show up from week to week. I blow out my radiator and pre-screen weekly and change oil and filter often but I'm still wondering at when I will start seeing trouble. What kind of engine life can I expect before valves or rings need work?

What items are first likely to need replacement? Thanks for your input!!