Massey Ferguson 04.0.0B – Transmission Control Unit (TRANS or TRANS1): Forward Clutch Solenoid Amp Draw Issue

The transmission control module has detected an abnormal electrical current (amperage) draw on the circuit that controls the forward clutch proportional solenoid valve. An abnormal amp draw typically points to a failing solenoid coil (internal short or high resistance), a short/open circuit in the wiring harness, or a poor electrical connection.

• 4707
• 4708
• 4709
• 4710
• T4 (2015-2021)
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7722
• 7724
• 7726

1. 1

   Inspect the forward clutch solenoid connector for water ingress, corrosion, or pushed-back pins

2. 2

   Test coil resistance across the pins of the forward clutch solenoid and compare to the reverse clutch solenoid; a significant variance indicates a failed internal coil

3. 3

   Check the wiring harness from the solenoid back to the TRANS controller for chafed wires, melted insulation, or pinch points that could cause a short to ground or an open circuit

4. 4

   Verify supply voltage to the solenoid with the key on to ensure the transmission controller is outputting the correct signal

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Solenoid

   Locate the transmission speedshift/shuttle input unit valve block (typically located on the side of the transmission housing). Identify the forward clutch proportional solenoid.

3. 3

   Removal

   Disconnect the electrical harness from the solenoid. Remove the retaining bolts or snap ring securing the solenoid to the valve block.

4. 4

   Extraction

   Carefully pull the solenoid valve out of the bore. Have a drain pan ready, as a small amount of transmission fluid will leak out. Inspect the bore for any debris or scoring.

5. 5

   Installation

   Lubricate the O-rings on the new solenoid valve with clean transmission fluid. Insert the new solenoid into the bore and secure it with the retaining hardware.

6. 6

   Reconnection

   Reconnect the electrical harness and reconnect the tractor's battery.

7. 7

   Calibration

   Because a new proportional valve will have slightly different flow characteristics than the old one, you must perform a transmission clutch calibration (e.g., Dyna-4 / Dyna-6 calibration procedure) using the tractor's dash display or diagnostic tool to ensure smooth forward engagement and prevent jerky shifting.