Massey Ferguson 05.02.33 – TRANS1: Issue With 4wd Solenoid Circuit Dyna VT (TRANS1)

The tractor's onboard diagnostic system has detected an electrical irregularity—such as an open circuit, short to ground, or short to power—in the circuit responsible for actuating the 4-Wheel Drive (4WD) engagement solenoid.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 7600 Series
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8600 Series
• 8670
• 8690
• 6700 S Series
• 7400 Series
• 7700 Series
• 8400 Series
• 8700 Series

1. 1

   Inspect the wiring harness leading to the 4WD solenoid valve for chafing, breaks, or melted insulation

2. 2

   Disconnect the plug at the 4WD solenoid and the TRANS1 controller harness connector to check for water ingress, corrosion, or pushed-out pins

3. 3

   Measure the resistance across the pins of the 4WD solenoid coil using a multimeter (an infinite reading indicates an open circuit, while zero indicates a dead short)

4. 4

   Check for proper voltage reaching the solenoid connector from the TRANS1 controller with the tractor running and the 4WD switch engaged

5. 5

   Verify the transmission control fuses in the main and secondary fuse boxes are intact

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the battery isolator switch to de-energize the electrical system.

2. 2

   Clean the Area

   Thoroughly clean the area around the 4WD solenoid valve on the transmission housing to prevent dirt from entering the hydraulic system.

3. 3

   Disconnect Wiring

   Unplug the electrical connector from the solenoid coil.

4. 4

   Remove the Coil/Valve

   If replacing just the coil: Remove the retaining nut at the end of the valve stem and slide the old coil off. If replacing the entire valve cartridge: Use a wrench to unthread the valve body from the transmission manifold. Have a catch pan ready, as a small amount of hydraulic oil will leak out.

5. 5

   Installation

   Thread the new solenoid valve into the manifold and tighten to the OEM torque specification. If only replacing the coil, slide the new coil over the existing valve stem and secure it with the retaining nut.

6. 6

   Reconnection

   Plug the electrical connector back into the solenoid.

7. 7

   Testing

   Turn on the battery isolator, start the tractor, and actuate the 4WD switch. Verify that the 4WD engages and disengages properly.

8. 8

   Clear Codes

   Use a diagnostic tool or the tractor's onboard terminal to clear the 05.02.33 historical fault code from the TRANS1 module.