Massey Ferguson 06.01.4C – HITCH: Issue With PTO Over Speed Compared To Engine Speed. (HITCH)

The tractor's computer is receiving a signal from the PTO speed sensor indicating that the Power Take-Off (PTO) shaft is spinning faster than physically possible based on the current engine RPM and the selected PTO gear ratio. This usually points to an erratic, high-frequency signal caused by a failing inductive speed sensor, wiring interference, or a faulty engine speed reading.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 5400 Series
• 5600 Series
• 5700 Series
• 6700 Series

1. 1

   Inspect the wiring harness leading to the PTO speed sensor at the rear of the transmission for chafed wires, moisture in the connector, or loose pins (a short or bad ground can cause erratic overspeed spikes).

2. 2

   Remove the PTO speed sensor and inspect the magnetic/inductive tip for metal shavings or heavy debris from the transmission/PTO clutch that could distort the reading.

3. 3

   Test the resistance of the PTO speed sensor using a multimeter (some sensors, like 4359947M1, should read approximately 540 Ohms).

4. 4

   Verify engine speed data by ensuring the tractor's tachometer is reading engine RPM correctly (a failing engine speed sensor reading artificially low will cause a false PTO overspeed calculation).

1. 1

   Prepare tractor

   Park the tractor on a level surface, apply the handbrake, and turn off the engine.

2. 2

   Disconnect battery

   Disconnect the tractor's battery to protect the electronic modules.

3. 3

   Locate sensor

   Locate the PTO speed inductive sensor. It is threaded into the rear transmission/PTO housing near the PTO output shaft.

4. 4

   Disconnect wiring

   Disconnect the electrical connector from the sensor.

5. 5

   Remove old sensor

   Unthread the old sensor from the housing. Have a rag ready, as a small amount of hydraulic/transmission fluid may weep from the port.

6. 6

   Install new sensor

   Thread the new OEM inductive speed sensor into the housing. (Ensure any required O-rings or spacing shims match the old unit so the sensor sits at the correct depth).

7. 7

   Reconnect wiring

   Reconnect the wiring harness securely.

8. 8

   Reconnect battery

   Reconnect the battery.

9. 9

   Clear fault code

   Use the tractor's dash interface or a dealer diagnostic tool to clear the stored 06.01.4C DTC code.