I have a JD LT155 I purchased very used! I was hearing a loud grinding coming from underneath and eventually the belt fell off. I noticed the transmission fan extremely bent and rubbing on the belt (which was also loose) throwing it off. Replaced the fan and the belt but now when I engage the parking break and/or push forward or backward pedal the fan and pulley shake and there is an even louder grinding noise. Is this maybe just the spacers worn down or is the transmission shot? Help please!