You know all those little ajustments you think of while mowing and then forget at the end of the day when peeling off your sweat drenched tee? Well I had noticed that my Toro Zmast front wheels did not spin real free and neither did the casters. They were not froze or anthing, but snug. The machine was always a little sluggish compaired to my ferris. Surely I reasoned that this little resistance up front would not make a difference on this heavy machine. I took time to adress this anoyance the other day and WOW it made a big difference. So if your machine is a little sluggish, check the casters and front wheels. Probably just killed the hillside performance, but thats why I have the ferris.