The Warner clutch on my Hustler Z will not engage when it gets warm. If I've run the mower for 15 to 20 minutes and disengage the clutch then try to engage it again it just clicks and nothing alse happens. After it cools down for 10 minutes or so it will engage again. The mower has 800 hours on the clock and I 've had it for 16 months. Does the Hustler warranty cover replacement of the clutch? I don't believe the Warner clutch has any air gap adjustment, so it looks like I'll have to replace it.