Serial 109143 Speeds in the mid 2s the crawler briefly comes to a stop--throwing the operator forward or back--happens more often in reverse when going faster--and resumes with no code. New TCU relay<it would not move at all with a CAN failure code this error was here before that but it has gotten worse since Both tracks affected it still goes straight Parking brake switch checks out it seems that it would make you cycle to neutral to resume when I tested it Transmission filter light when starting goes out when it warms up it was a cold day Does anything about this jump out at anybody?
You checked this on the TCU itself, and not the monitor, correct? Sounds like a wiring issue and that the jolt of the bump is breaking a connection. Try turning the anti-stall off. If the issue goes away check the engine speed sensing circuit/wiring. If the issue remains, maybe run separate power and ground wires to the TCU to see if that resolves the issue.
Does it have a seat safety switch that would affect it if interrupted?? Maybe needs a fatter operator?
Nope.
Had this problem years ago machine would come to an abrupt sudden stop. Inspect the wiring harness under the floor plate. Do not remember the exact location there was a very small bare spot in the harness contacting ground at times. Inspect carefully where harness may be laying against pump housing brackets ETC. It only takes a very very small bare spot to kill the 5 volt power to the sensors.
And on that note, I have had more than one machine with cab/rops mounts shot and the cab sat a little lower crushing the harness.
Go a chance to go back for a while today. TCU had codes of F3P5 FP93 F393 F3X1 F359 AI'd these nothing really jumped out from the results Ran a Jumper from the large wires in the fuse panel to a back-probe at the red wire in the leftmost plug of TCU did 2 laps around field without detecting the same problem at up to 3 speed. Tried the same running from wire P12 at the fuse panel did not have the same but it is hard to know if the back-probe is making good contact
Had to leave today. I plan when I get back to continue to trace P12 wire back from the 10 amp fuse--because bypassing P12 did not seem to work--12V power did seem to work. The laps around the field without failure could have been a fluke so confirm that power works I guess.
Did pop the cover off of the TCU clean dry and unburnt in there cleaned ground-strap to fender CAN Measures 120 ohm with the TCU end terminating resistor unplugged likewise at the engine end. 60 ohm back-probing with both in. I was checking the wrong one.
The F3P5 might be an issue. F393 would be related. Both of which could be related to an intermittent electrical connection. Check your messages.