Massey Ferguson 4.01.9B – TRANS2: Issue With Powershift N Solenoid Supply Voltage (TRANS2)

The transmission controller is detecting an incorrect voltage supply (either too high, too low, or an open/short circuit) on the circuit powering the "N" (Powershift/Range) solenoid. This prevents the transmission from shifting ranges electronically and can cause the tractor to refuse to move or become stuck in a single range.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5709SL
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7722
• 7724
• 7726
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 6711
• 6712
• 6713
• 6714S
• 6715S
• 6716S
• 6718S

1. 1

   Verify the tractor's base voltage, ensuring the battery is outputting a healthy 12V and the alternator is charging correctly.

2. 2

   Check the wiring harness running from the TRANS2 module to the side of the transmission for chafed wires, melted insulation, or pinch points that could cause a short to ground or an open circuit.

3. 3

   Disconnect the plug at the Powershift N solenoid, clean the terminals with electrical contact cleaner and a wire brush, and apply dielectric grease before reconnecting.

4. 4

   Use a multimeter to measure the resistance across the solenoid pins to determine if the coil is open (infinite resistance) or shorted.

5. 5

   Test the indirect transmission switches linked to these solenoids to ensure they are sending the correct signal to the TRANS2 module.

1. 1

   Locate the Solenoid Bank

   The range change / powershift solenoids are located externally on the side of the transmission housing (typically a bank of four solenoids on Dyna-6 models).

2. 2

   Clean the Area

   Thoroughly clean the side of the transmission around the solenoid bank to prevent dirt or debris from entering the hydraulic system when the valve is removed.

3. 3

   Disconnect Power

   Disconnect the tractor's battery to prevent accidental shorts during the repair.

4. 4

   Remove the Solenoid

   Unplug the electrical connector from the faulty "N" solenoid. Remove the retaining bolts holding the solenoid/electrovalve to the transmission block.

5. 5

   Install the New Solenoid

   Lubricate the O-rings on the new solenoid with clean hydraulic/transmission fluid. Insert the solenoid into the valve block and torque the retaining bolts to OEM specifications.

6. 6

   Reconnect and Test

   Reconnect the electrical plug, reconnect the battery, and clear the 4.01.9B fault code using a diagnostic tool. Test drive the tractor to ensure smooth range shifting.