Massey Ferguson 04.00.64 – Transmission Control Unit (TRANS): Transmission Turbo Clutch Solenoid Voltage Supply Issue (TRANS)

Actuation of the turbo-clutch solenoid valve (Y004) is faulty due to a voltage supply problem. When this occurs, the TK (turbo clutch) valve cannot be actuated properly, which prevents the high-pressure circuit from closing to the tank, meaning the tractor cannot build up the necessary high pressure to achieve traction. Warning: The tractor must not be driven.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Check transmission control fuses, specifically F56 for the Y004 clutch/turbo-clutch solenoid valve

2. 2

   Inspect the wiring harness and connectors between the basic control unit ECU (A050) and the turbo-clutch solenoid valve (Y004) for chafing, breaks, or corrosion

3. 3

   Test the electrical resistance of the turbo clutch solenoid valve to determine if the internal coil has shorted or failed open

1. 1

   Immobilize the Tractor

   Ensure the tractor is parked safely on level ground with the engine off, as the tractor should not be driven with this active fault.

2. 2

   Locate the Valve

   Locate the turbo clutch solenoid valve, which is fitted directly into the transmission valve block.

3. 3

   Replace Fuses (If Applicable)

   If diagnostic checks revealed a blown fuse (e.g., F56), replace it. If it blows again immediately upon key-on, there is a dead short in the solenoid or harness.

4. 4

   Remove the Faulty Solenoid

   Disconnect the electrical connector from the turbo clutch solenoid valve. Remove the retaining hardware and carefully extract the valve from the valve block.

5. 5

   Install the New Solenoid

   Lubricate the O-rings on the new OEM solenoid valve and install it into the valve block. Secure the retaining hardware.

6. 6

   Reconnect and Clear Codes

   Reconnect the electrical harness. Use a diagnostic tool to clear the 04.00.64 fault code from the TRANS module.

7. 7

   Test Operation

   Start the tractor and verify that the transmission engages properly and the code does not return.