I have a 2002 Dixie Chopper Flatlander that runs great, but has trouble going up hills, or even the slightest incline. Just because it is a Flatlander doesn't mean it can't go up hills, does it? The dealer said it could be the hydraulic pump and there is nothing you can do about it. I have two other Dixie Choppers, non-Flatlanders, and they're fine. Anybody else have this problem?