Massey Ferguson T145 – Transmission Control Module (TRANS or TRANS1): The PTO Is Turned On But The PTO Is Not Turning
Issue description
This code triggers when the tractor's electronic system detects that the Power Take-Off (PTO) switch has been activated, but the PTO output shaft fails to rotate, or the engagement caused the engine RPM to drop excessively, triggering the anti-stall safety function.
Applies to these machines
20 machines- 7616
- 5612
- 7622
- Interim Tier 4 (2012-2015)
- 7614
- 5611
- 7615
- 5610
- 5613
- 7620
- 5609
- 7618
- 5608
- 7619
- 7626
- 7624
- 6400
- 6600
- 6700
- 7700
Check the cause
Check engine speed to ensure it is sufficient before engaging the PTO (anti-stall function may be halting the PTO)
Verify the PTO output shaft speed sensor (X16) and the PTO clutch speed sensor (X15) for discrepancies or lack of signal
Test the Rear PTO clutch solenoid valve (X7) for an open circuit, short circuit to +12V, or short circuit to ground
Inspect for mechanical faults such as a seized PTO output shaft, a faulty PTO speed selection lever, or a burnt-out PTO clutch pack
Repair steps
Clear the Code & Retest
Clear the transmission codes. Increase engine RPM to a stable operating range and attempt to engage the PTO. If it engages without stalling, the issue was likely operator error (engaging at too low of an RPM).
Inspect Wiring Harness
Visually inspect the wiring harness leading to the PTO clutch solenoid and the PTO speed sensors at the rear of the transmission housing. Look for chafed wires or corroded connectors.
Test/Replace the Solenoid
Using a multimeter, check the resistance of the PTO clutch solenoid coil. If it is out of specification, open, or shorted, replace the solenoid coil/valve assembly.
Test/Replace the Speed Sensor
If the solenoid is functioning and receiving voltage but the PTO still won't register as turning, remove and inspect the PTO speed sensor. Clean any metallic debris from the magnetic tip. If it fails to output a signal when tested, replace the sensor.
Mechanical Repair
If all electrical components (sensors, solenoids, and wiring) are verified good, the transmission/PTO housing must be opened to inspect the mechanical PTO clutch pack and driveline for physical failure or seizing.
Parts you might need
(10)PTO Speed Sensor
4359944M1Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Speed Sensor
3583285M1Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Speed Sensor
4359947M1Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Speed Sensor
3790881M1Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Speed Sensor
3825672M91Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Speed Sensor
3716042M1Often threads into the rear PTO housing. Ensure the correct cable length (e.g., 400mm) and thread size (e.g., 32mm) for your specific model.
PTO Clutch Solenoid (Coil / Valve)
3619764M12-pin fitting, 13mm bore ID. This diode-incorporated solenoid is often shared with the PTO brake, 4WD, and Diff Lock circuits.
PTO Clutch Solenoid (Coil / Valve)
3619760M912-pin fitting, 13mm bore ID. This diode-incorporated solenoid is often shared with the PTO brake, 4WD, and Diff Lock circuits.
PTO Clutch Solenoid (Coil / Valve)
3616586M12-pin fitting, 13mm bore ID. This diode-incorporated solenoid is often shared with the PTO brake, 4WD, and Diff Lock circuits.
PTO Clutch Solenoid (Coil / Valve)
3616587M12-pin fitting, 13mm bore ID. This diode-incorporated solenoid is often shared with the PTO brake, 4WD, and Diff Lock circuits.
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