I have a JD 329e compact track loader. Recently it started driving erratically and eventually stopped moving. The trouble code "left wheel speed sensor erratic or incomplete data" came on. I have lifted the cab and checked connections, i pulled the inspection plate on the front side of the wheel motor and tried to see if the connection was loose but it looks like i am going to have to pull the track off to get to it. First question is does the wheel speed sensor have to be calibrated or will the computer need to be reset if i install a new one. Second question is what is the best way to get the track off when the wheel motor will not turn. i have never replaced a track without the motor turning. Also the loader has selectable ISO or H pattern controls. I operate in iso bu use H pattern when i replace the tracks so i can operate the tracks seperately more precisely.