Machine starts and drives forward at low speeds fine. But if driving at full speed suddenly locks up and stops instantaneously. Fuel system fine all new filters will idle at all throttle settings.
What stops? Just the machine as its moving or the engine stops? Your not specific enough for anyone to help.
Also post a Serial Number and answer the question do you know how to access Diagnostic Codes using the monitor panel on the dash.?
Serial number www02205. Yes, I can access the codes. Thanks
The only active code is A039 2688-08
And that appears to be your problem. The RH track motor #2 speed sensor signal is "erratic, intermittent, or incorrect." Seeing as the machine works OK at low speed the first thing I would suggest is to remove the speed sensor and clean any metallic debris from the nose end of it. The troubleshooting procedure is attached. You will have to start at Step 2 because you don't have ET, but hopefully if there is a problem in a harness somewhere this ought to find it. See where that gets you.