John Deere BIF000186.16 – BIF: Rear PTO Speed Warning

The BIF (Basic Informator) control unit has detected that the rear Power Take-Off (PTO) speed has exceeded a predefined limit. This is an informational alert indicating an overspeed condition or a fault in the PTO speed monitoring circuit, independent of the selected PTO speed. For example, on 6020 to 6920S series tractors, this warning activates when the PTO speed surpasses 620 RPM (+/- 10 RPM).

• 5620
• 5720
• 5820
• 6010
• 6110
• 6210
• 6310
• 6410
• 6510
• 6610
• 6810
• 6910
• 6020
• 6120
• 6220
• 6320
• 6420
• 6520
• 6620
• 6820
• 6920
• 6920S
• 6130
• 6230
• 6330
• 6630
• 6830
• 6930
• 7130
• 7220
• 7230
• 7320
• 7330
• 7420
• 7520
• 7720
• 7820
• 7920

1. 1

   Verify the correct PTO mode is selected (on 7020 series, try pulling the display mode switch to activate the 1000 RPM mode to clear erroneous warnings)

2. 2

   Monitor the rear PTO speed reading on the tractor's display for erratic readings or speeds exceeding 620 RPM during normal operation

3. 3

   Visually inspect the rear PTO speed sensor (located on top of the rear PTO housing) and its wiring harness for damage, loose connections, or corrosion

4. 4

   Perform a sensor function test by manually turning the PTO shaft and observing the signal output for consistent changes

5. 5

   Measure the PTO speed sensor resistance with a multimeter (a healthy sensor typically reads around 3000 Ohms; zero or infinite resistance indicates failure)

6. 6

   Inspect the tone wheel on the PTO shaft for damage, missing teeth, or looseness

1. 1

   Prepare tractor for service

   Shut down the tractor, remove the key, and disconnect the battery ground strap to prevent accidental starting.

2. 2

   Access the PTO speed sensor

   Locate the rear PTO speed sensor on the rear transmission housing, typically just below the top link anchor point. Remove any protective covers if necessary.

3. 3

   Test and replace the speed sensor

   Disconnect the wiring harness and perform a resistance test. If the sensor fails (reads zero or infinite resistance), unscrew and remove it. Install the new sensor, ensuring the O-ring is properly seated, and reconnect the harness.

4. 4

   Inspect and repair wiring harness

   If the sensor tests good, thoroughly inspect the wiring harness from the sensor back to the BIF control unit. Repair or replace any broken, chafed, or corroded wires and connectors.

5. 5

   Reassemble and verify repair

   Reconnect the battery, start the tractor, and engage the PTO. Monitor the PTO speed on the display to ensure it reads correctly and the fault code does not reappear.