Many factors are getting involved in that one. Rubber quality in many cases isn't what it used to be. Even the belts on the car and pickup engines are cheaper than 5 to 10 years ago. I have a 92 Dodge Diesel PU and the first belt went 9 years and 210k miles. The new $90+ belt that was bought a year ago went bad last week, less than 9k after it was put on. When I bought my N6 used it chewed up 3 belts before we(the dealer and I) figured out that the Main Clutch Cross Shaft was bent and chewing on the belt and throwing it off. My Dealer even though it was USED ate 2 of the 3 belts, he relized that he had sold a defective machine, he also cut in half the price and labor of the new shaft installation. NO Fuss was made! He made money on the sale of the machine and on 1_2 the repairs and 1 belt and ate the rest to keep a good customer, without me even asking. And as P T Barnum said, "There is a sucker in every crowd!" a 9650 JD, neighbors STS still isn't working right after 3 seasons, the 2388 does 75% of the work. Personally I would have contacted Gleaner and found out if the belts were a problem this past fall for that n and let Gleaner and the Dealer work it out, anyone can get a bad bunch of belts. And Gleaner would have more clout to get better quality belts.