I bought a John deere 700h Lt Dozer. Over all great running machine. Issue im having is the right track doesnt want to turn at low rpm in reverse, it will track almost straight when im at full throttle in reverse( seems to pull alittle left but the right side is tracking at at high rpm). Machine tracks fine going forward at any rpm. It did have the leftside final drive replaced which is the side that tracks well at any rpm going forward and reverse. Am I to expect to replace the right side final drive now with this issue or is this more of a speed sensor or pump calibration issue? Or controller issue? Any adive is appreciated.
Welcome to HEF sandscnc ! Complete machine serial number please. Remove the cover from the TCU. Press the menu button until the word CODE appears. Press select. If there are any codes, press next to view them all. Record what you see and post here. Then when the word END is displayed, press and hold select until you see F300 which means the codes are cleared. Then run the machine to see if anything comes back. Post the code/codes that come back. Did you try to perform a calibration?
Thank you MG2361. Serial number T0700hx903037 I will try that and get any codes today. I have not done the recalibration yet. I was looking for the procedure online. Just downloaded the manuals for my machine. Will attempt to recalibrate today.
Check for the codes first, clear them and run it to see what comes back before trying a calibration. If you perform a calibration on that particular model and it fails, your machine will be dead in the water until the issue is resolved. A calibration should wait until any parts are replaced or if there are no codes. Check your messages.
Pulled the codes. f3m4 speed sensor F321 started not in park F3p5 B2 FNR sensor F375 indicates an issue with the input shaft speed pickup , which could be caused by an unplugged or damaged sensor. F324 indicates a problem with the transmission, specifically related to gear selection and the shifter assembly F385 left track speed sensor will clear them and see what comes back. Looks like left side speed sensor i think.