Massey Ferguson 04.02.6B – TRANS1: Issue With Range 1 Engaged Switch Signal

The transmission controller is not receiving the correct electrical signal from the Range 1 position switch to confirm that Range 1 has successfully engaged. When this signal is missing or out of range, the tractor may experience jerky hydraulic responses, refuse to shift between ranges, or refuse to move altogether.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5410
• 5420
• 5425
• 5435
• 5445
• 5455
• 5460
• 5465
• 5470
• 5480
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710 SL
• 5711 SL
• 5712 SL
• 5713 SL
• 6445 through 6499
• 6612 through 6616
• 6712 S through 6718 S
• 7614 through 7626
• 7714 through 7726

1. 1

   Inspect the wiring harness leading to the transmission range switch bank on the side of the transmission for chafed wires, damaged insulation, or corrosion inside the electrical connectors.

2. 2

   Use a multimeter to check for continuity across the switch in each position to verify if the internal contacts have burned out or are creating intermittent connections.

3. 3

   Ensure the Range 1 Solenoid Valve is functioning and receiving power, as a mechanical failure in the solenoid bank can prevent the switch from registering engagement.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, lower any implements, and turn off the engine.

2. 2

   Locate the Switch

   Locate the transmission range switch and solenoid bank on the side of the transmission housing.

3. 3

   Clean the Area

   Thoroughly clean the area around the switch bank to prevent dirt, dust, or moisture from entering the transmission block during removal.

4. 4

   Disconnect

   Carefully unplug the electrical connector from the faulty Range 1 engaged switch.

5. 5

   Removal

   Unthread and remove the faulty transmission range switch from the transmission housing. Have a rag ready to catch any minor fluid drips.

6. 6

   Installation

   Install the new replacement switch. Tighten it securely to the manufacturer's torque specifications to ensure the weather-sealed design functions correctly.

7. 7

   Reconnect

   Reconnect the electrical wiring harness, ensuring the connector clicks into place and the weather seal is intact.

8. 8

   Testing and Clearing

   Start the tractor and test the transmission by shifting through the ranges to confirm smooth operation. Clear the 04.02.6B fault code from the TRANS1 module using the tractor's dashboard diagnostic interface or a compatible diagnostic tool.