Massey Ferguson 04.X.8F – TRANS: Issue With Tyre Size Configuration

The transmission controller has detected that the programmed tyre size parameters are missing, invalid, or do not correlate with the expected wheel speed sensor data.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)

1. 1

   Verify physical tyre size by checking the actual dimensions of the front and rear tyres installed on the tractor (e.g., 650/85R38, 600/65R38).

2. 2

   Connect a compatible diagnostic tool and navigate to the transmission (TRANS) module parameters to check configuration data.

3. 3

   Compare the current 'Tyre size, configuration' value stored in the TRANS module to see if it has been wiped, corrupted, or set incorrectly compared to the physical tyres.

4. 4

   Inspect wheel speed sensors to ensure there are no accompanying wheel speed sensor faults (such as 04.X.82 or 04.X.83) which could confuse the controller.

1. 1

   Connect diagnostic interface

   Connect your diagnostic interface to the tractor's diagnostic port.

2. 2

   Boot diagnostic software

   Boot up the diagnostic software (e.g., OHW 18.0.0 or OEM equivalent) and perform a total vehicle diagnosis.

3. 3

   Access TRANS module settings

   Access the TRANS (Transmission) module settings.

4. 4

   Locate configuration function

   Locate the "Tyre size, configuration" function under the parameterizations/configuration menu.

5. 5

   Input tyre size

   Input the correct rolling circumference or standard tyre size designation that matches the physical tyres on the machine.

6. 6

   Save configuration

   Save the configuration to the module.

7. 7

   Cycle ignition

   Cycle the tractor's ignition (key off, wait for the modules to power down, key on).

8. 8

   Clear fault code

   Clear the 04.X.8F fault code from the TRANS module.

9. 9

   Test drive

   Test drive the tractor to ensure the transmission shifts correctly and the code does not return. (Note: If the module repeatedly loses this configuration upon restart, the Transmission Controller itself may be suffering from an internal memory failure and will require replacement or a software re-flash).