Are these from your 277..? If they are then maybe you have found your issue. Check out Pages 72 & 120 of document reference REHS0126 that I sent to you.
2687 - RH Drive motor speed sensor #1
2688 - RH Drive motor speed sensor #2
-2 is "Date erratic, intermittent, or incorrect"
-8 is "Abnormal frequency, pulse width, or period"
Sound like you have an issue with the speed sensors (or the wiring harness) on the RH Drive Motor. I'll e-mail you the diagnostic procedures.
E569-2 is "Unexpected Left Motor Reverse Speed Detected" - This event indicate that unexpected motor speed in the indicated direction has been detected. The direction of the wheels/tracks has moved faster or slower than expected. Ensure that the latest available machine flash file is installed. Probable Causes - Refer to Troubleshooting, "Motor Speed is Unexpected"
· Pump stuck at maximum displacement - Motor speed will stick in max turtle gear ratio
· Motor stuck at minimum displacement - Speed will be stuck in rabbit gear ratio (two-speed machines only)
· Intermittent diagnostic for a motor speed sensor
· Active diagnostic code for the hydraulic temperature sensor
E391-1 is "Inlet Air Restriction" - Activates when the engine has run for > 1 minute and the N/O air cleaner indicator switch closes. Deactivates when the N/O air filter switch returns to the open state (with engine running).
Specification for the air cleaner indicator switch to close is 7.5 kPa (1.09 psi) or 30.11 inches of H2O. - Spec tolerance is ± 5% at 23° C (73° F). The engine indicator located on the left side instrument cluster turns amber.
· Check the engine air cleaner inlet and ducting. Ensure that the passageway is not blocked or collapsed.
· Inspect the engine air cleaner element. Replace if needed.
E875-2 is "Low System Voltage" - Activates when the engine is running and battery voltage is < 12.0 VDC for 30 seconds. Deactivates when battery voltage is > 12.25 VDC for 2 seconds. There is an increased charging system problem. Battery voltage is becoming too low for continued operation. If the level 2 event remains active for more than 5 minutes or is repeatedly activated, shutdown operation at the earliest opportunity.
Troubleshoot the charging system.