I have a Walker MTGHS with a 52" deck. It seems like the blades are not rotating fast enough. It has a brand new engine...less than 10 hours so I don't think it's the motor. It just bogs down really easy...have to cut real slow. I'm wondering if there is anything else I can check? Deck gear box, pto box, belt adjustment...etc. Anyone else have this problem or can provide helpful information, I would really appreciate it. It seems that the 52" ghs deck is fairly uncommon, maybe it's just the size of the deck? Thanks!