Case IH 106 – TRANS: C3-4 clutch solenoid or its wiring failed open or shorted to ground

The controller has detected an electrical fault—either a broken connection (open circuit) or a wire touching the chassis/ground (short to ground)—in the circuit responsible for actuating the C3-4 transmission clutch.

• MX Magnum
• STX Steiger
• MX Magnum series
• TG Series
• Steiger
• Puma
• T8 series
• TG210
• TG230
• TG255
• TG285

1. 1

   Inspect the wiring harness leading to the transmission shift valve block for chafed wires, broken connections, or exposed copper shorting to the tractor's chassis (ground)

2. 2

   Check the transmission neutral latch relay by clearing fault codes, replacing the relay with a known good one, running the tractor, and checking if the code returns

3. 3

   Monitor if the fault occurs only when the tractor reaches operating temperature (indicates the solenoid coil is failing internally)

1. 1

   Preparation

   Park the tractor on a level surface, ensure all hydraulic pressures are released, and disconnect the battery.

2. 2

   Access the Valve Block

   Locate the transmission shift valve assembly (typically located on the right front side of the speed transmission housing). You may need to remove transmission covers or access panels depending on the specific tractor model.

3. 3

   Disconnect Electricals

   Carefully unplug the electrical harness connector from the C3-4 clutch solenoid.

4. 4

   Remove the Solenoid/Valve

   Unbolt the faulty solenoid from the shift valve block. Note: On some Magnum 7100/7200/8900 series, the entire shift valve assembly may need to be removed and disassembled on a bench to inspect the spool valves before replacing the solenoid.

5. 5

   Installation

   Install the new C3-4 clutch solenoid (or remanufactured shift valve assembly) and torque the mounting bolts to OEM specifications.

6. 6

   Reassembly

   Reconnect the electrical harness, reinstall any removed covers, and reconnect the battery.

7. 7

   Testing

   Clear the fault codes from the TRANS controller, start the tractor, and test the transmission through its ranges to ensure the C3-4 clutch engages properly without throwing Code 106.