JD 850C I. When cribbed up for calibration, I noticed the left track will very slowly tram forward. It will allow me to complete the calibration but says "LrOD" on the screen. I can't find that in the manual. Any suggestions??
You need to do a "nulling" process. On top of each pump there is a set screw with a jam nut. Back that jam nut off slightly and turn the set screw one direction till the track bearly starts to move, turn the screw back the other way till the track just starts to move the opposite direction. Split the difference and tighten the jam nut down. That will null the motors out and "should" go through calibration.