Massey Ferguson 04.01.29 – Transmission Control Unit (TRANS): Issue With Message From Speed Lever On Armrest (TRANS)

A communication failure, signal voltage irregularity, or CAN bus message error between the speed lever (the multipad control joystick located on the operator's armrest) and the transmission controller.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5700 Series
• 6700 Series

1. 1

   Inspect the wiring harness running from the armrest joystick to the TRANS module, specifically looking for pinched wires within the armrest pivot point.

2. 2

   Disconnect the joystick harness and inspect the pins for corrosion, pushed-back terminals, or moisture ingress.

3. 3

   Verify that the joystick is receiving proper reference voltage and ground to rule out electrical issues before replacing the joystick.

1. 1

   Power Down

   Turn off the tractor and disconnect the negative battery terminal to prevent electrical spikes.

2. 2

   Disassemble the Armrest

   Remove the retaining screws on the underside or side trim of the control armrest to access the internal wiring and the base of the joystick.

3. 3

   Disconnect the Joystick

   Unplug the electrical connector linking the joystick to the armrest sub-harness.

4. 4

   Remove the Joystick

   Unscrew the mounting bolts/screws securing the joystick assembly to the armrest console and lift it out.

5. 5

   Install the New Part

   Seat the new joystick, secure the mounting hardware, and plug in the electrical connector.

6. 6

   Reassembly

   Reattach the armrest trim and covers.

7. 7

   Reconnect Power & Clear Codes

   Reconnect the battery. Turn the ignition on and use the tractor's diagnostic display (or dealer service tool) to clear the stored 04.01.29 fault code.

8. 8

   Calibration

   Depending on the exact transmission (Dyna-4, Dyna-6, or Dyna-VT), a transmission/lever calibration may need to be performed via the dashboard menu or dealer software to ensure the new lever's neutral and maximum positions are learned by the TRANS module.