Case IH 164 – TMF (Tractor Management Function): PTO shaft speed has not been detected within 3.6 seconds of being turned ON.

The tractor's control system commanded the PTO clutch to engage, but the PTO speed sensor failed to detect any rotation of the PTO shaft within the expected 3.6-second window. This can be caused by an electrical failure (sensor or wiring) or a mechanical/hydraulic failure (the clutch is physically not engaging).

• Magnum
• Magnum 180
• Magnum 190
• Magnum 210
• Magnum 215
• Magnum 225
• Magnum 245
• Magnum 260
• Magnum 305
• Magnum 315
• Magnum 370
• MX150
• MX170
• MX180
• MX270
• MX275
• MX305
• STX 280
• Steiger 500
• Steiger 550
• Maxxum 100
• Maxxum 110
• Maxxum 115
• Maxxum 120
• Maxxum 125
• Maxxum 130
• Maxxum 140
• Puma 115
• Farmall 85C
• Farmall 95C
• Farmall 95U
• Farmall 105C
• Farmall 105U
• Farmall 115U

1. 1

   Inspect the PTO speed sensor and its wiring harness for physical damage, corrosion, or loose connections

2. 2

   Test the PTO speed sensor for proper resistance and voltage output to ensure it is capable of reading the shaft's rotation

3. 3

   If the sensor and wiring are good, check the hydraulic pressure at the PTO clutch valve to ensure the clutch is receiving the fluid pressure required to engage

4. 4

   Ensure the PTO shaft is not physically jammed and that the PTO clutch pack has not failed or slipped excessively

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Locate the Sensor

   Locate the PTO speed sensor, typically mounted on the rear PTO housing near the PTO shaft.

3. 3

   Check/Repair Wiring

   If the wiring harness is chafed or the connector is corroded, repair the wiring or replace the connector pigtail.

4. 4

   Replace the Sensor

   If the wiring is intact but the sensor failed testing, remove the retaining bolt holding the PTO speed sensor in place. Pull the old sensor out, lubricate the O-ring on the new sensor, and install it. Torque the retaining bolt to OEM specifications.

5. 5

   Address Hydraulic/Mechanical Issues (If Applicable)

   If the sensor was not the culprit, the repair will require rebuilding the PTO clutch pack or replacing the PTO engagement solenoid/valve based on the results of the hydraulic pressure test.

6. 6

   Clear Codes and Test

   Reconnect the battery, start the tractor, and clear the TMF fault codes. Engage the PTO to verify that the shaft spins and the code does not return.