I am looking at buying a Scag 36" walk behind belt drive. Its about four years old and looks immaculate. It was only used for personal use. He asking $1,800 and he already told me that he will deal a little. Its has a mulching plate and a strip kit on it as well. He also said it pulls a little to the left. Why would this be happening? Is that normal? Is this a good buy or should I stay away?