I have a 60" Hustler Super Z with a 31 hp Kawasaki with just over 500 hours. I have owned the mower for 2 years 8 months and have just had to replace the clutch. I would have thought the clutch would have lasted for at least 1000 hours. The dealer inquired about Hustler possibly replacing the clutch but was told that the 2 year warranty had passed and Hustler would not replace the clutch. The dealer was told that life of clutch could vary due to moisture exposure and cutting conditions. The mower is kept in an enclosed trailer and is used to cut lawns not cow pastures or hay fields. In reading the owners manual it appears that Hustler figures the average mower used for business will probably put on 500 hours per year. I'm pretty disappointed in the clutch going after only 500 hours over 2 seasons. How many hours are most of you getting out of your clutches? I'm asking the questions for both Hustlers owners and owners of other brands. I appreciate any input.