If the process was successful it's supposed to display 1111 well mine displays FR. I changed it out and now I can calibrate the dozer all the way to the end at which point you press the cal button for the last time. As you stated the bad track sensors don't always throw a code as this one didn't just found out through the volt test.
#John deere 850 dozer code f640 manual#
Re-reading the original post I see that your machine had moved without command, correct? Is it still doing that? Might want to perform a flushing procedure which is in the manual TM1588, section 9026-25. Take care of that and try to calibrate again and we will see where we need to go from there.Īre both tracks turning when placed into FWD during that part of the calibration? Does the LD (L = rear pump left motor PCP, D = left motor speed sensor) show up after this point or when your done performing the FWD and REV threshold calibration? If you count the flashes of the light on the dash are the number of flashes approximately the same in fwd as in rev until the track moves? Your tests do indicate a speed sensor issue. That is usually enough for the speed sensor to send the feedback the controller is looking for. My question for you is when y'all had that 850c in the shop and calibrated it how much did the tracks turn when the machine was at 1500rpm and the stick was pushed in forward and the reverse? Very minimal or about a whole revolution?ĭuring the threshold portion of the calibration they typically will not turn at all until the controller ramps up the milliamps enough to turn the tracks slightly (1 -2 track pad lengths, if that). The 2 lower gears don't really do anything besides minimal movements.Īlso I replaced both fuel filters and the alternator because it was weak at 24.2v and now the dozer will continue movement after about 20min and doesn't all of a sudden stop. (Gonna try to pick up a sensor tomorrow and see if that does the trick)įor your second question it tracks somewhat normal in operation mode, you can obviously tell it doesn't track straight and it only seems to work when the transmission is in high gear. I then went to test the left track sensor on black to green wire and in reverse it showed 313.9mv and forward it showed 309.2mv I tried adjusting the sensor to get it to read between (4.6-4.8v) in one of the directions but no luck so I'm pretty sure this is my issue. It only flashes letters LD at the end of the first half of calibration. The f621 code went away at this point and is throwing no more codes. machine at constant speed on white and black was showing 2.74v.Įverything checked out here so the next thing I did was adjust the sensor. Red to black wire I received 5.02v.black to green was 4.71v in reverse and 274mv in forward.white to black was showing alternate values of 4.71v and 274mv. I tested the sensor according to the technical manual. Sorry it's took me a while to get back to you mg2361. That leads me to believe the monitor is screwed up or something with the tcu? The hydrostatic speed sensor tested within spec, pin 17 to the back of the monitor tested the proper 14v. The only thing that doesn't seem to work from what I've found is the rpm read out. (So forward voltage reading should actually be reverse and vise versa) You can then progress no further than this.Īll the rotary sensors for the controls all seem to be within spec range but reversed of what they're supposed to be. 45e is supposed to stop flashing before you let up on the decelerator pedal but doesn't stop flashing until you let off the decelerator pedal.
#John deere 850 dozer code f640 software#
Screen will pop up with tcu software 600, then 11, then p, move the park lever down and 45e pops up. Holding the button down as well as the decelerator pedal, start the engine. They guaranteed it with a 2 year warranty so I hope they knew what they were doing I used acs industrial services out of north Carolina to fix the tcu. Only one that might still be left is f621 but I adjusted the right track speed sensor so not to concerned about that. No codes, I fixed everything pertaining to the ones that popped up. If it does ever move when taken out of park when it stops by itself it won't move again. The dozer will only move when taken out of park, and it doesn't happen every time.
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