Hi Guys, received a new Troy BT200 today and I think it was assembled wrong? From the operators view LF wheel is driven, The RF wheel is not, RF wheel looks the same as the rear wheels & does not match the LF wheel. There is an exposed gear that is turning when the LF is driven (see pics) but this gear does not engage any part of the RF wheel. In fact, the RF wheel looks like another rear wheel? I'm confused. Any help appreciated. Is this mower a one wheel drive? Or did some new guy put the wrong wheel on this?