Massey Ferguson 06.02.1B – TRANS1: Issue With Voltage To PTO ECO Speed Solenoid Dyna VT

This indicates an electrical fault—likely an open circuit, short circuit, or out-of-range voltage drop—detected in the circuit that powers the solenoid responsible for engaging the Economy (ECO) speed mode of the Power Take-Off (PTO).

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 6700 S
• 8600
• 8700 S

1. 1

   Inspect the wiring harness running from the TRANS1 controller to the PTO ECO Speed Solenoid on the transmission valve block for chafed wires, rodent damage, or melted insulation.

2. 2

   Disconnect the plug at the PTO ECO solenoid and check for water ingress, bent pins, or corrosion.

3. 3

   Turn the key to the ON position and command the PTO ECO speed via the cab switch. Use a multimeter to verify if the correct reference voltage is reaching the solenoid connector.

4. 4

   Measure the resistance across the pins of the PTO ECO Speed Solenoid itself. If it reads as an open circuit (infinite resistance) or a dead short, the solenoid coil has failed internally and requires replacement.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, turn off the engine, and disconnect the negative battery terminal.

2. 2

   Locate the Valve

   Locate the PTO control valve block on the Dyna VT transmission housing. Identify the specific solenoid for the ECO speed circuit.

3. 3

   Clean the Area

   Thoroughly clean the area around the solenoid with brake cleaner or a degreaser to prevent dirt from entering the transmission's hydraulic circuit when the valve is removed.

4. 4

   Removal

   Disconnect the electrical harness plug from the solenoid. Remove the retaining bolts securing the solenoid valve to the block. Carefully pull the solenoid out.

5. 5

   Installation

   Lubricate the O-rings on the new solenoid valve with clean transmission/hydraulic fluid. Insert the new valve into the block, ensuring it seats properly without pinching the O-rings.

6. 6

   Secure

   Install and tighten the retaining bolts to the manufacturer's specified torque.

7. 7

   Reassembly

   Reconnect the electrical harness plug until it clicks securely. Reconnect the battery.

8. 8

   Testing

   Start the tractor, engage the PTO in ECO mode, and verify operation. Use a diagnostic tool to clear the 06.02.1B historical fault code from the TRANS1 module.