that is a common issue with all Zero turn mowers, but i have to say, if you haven't had to replace a blade tower/spindle yet, then you must have a golf course for a lawn because the one i used to have many years ago would go through a full deck set each year, (3 towers at $85 each) the fact that you can cut your yard in an hour and a half tells me you are mowing less than five acres and you probably haven't even changed the blades themselves yet.
yeah my yard is fairly flat but not smooth, i'm guessing its just under 2 acres that i mow and i haven't changed blades yet, probably will wait as long as possible
I have the exact mower, year and 1/2 Now when I go cut grass it accelerates and the Decelerates all the way till I finish cut half an acre. Can't find the problem. Thanks. We be looking for a fix. This mechanic's now a days want to much money. Houston Texas.