Fendt 04.1.53 – Transmission Control System: B009 - Discharge temperature sensor

Transmission oil temperature more than 110°C. This code is triggered when the B009 temperature sensor detects that the oil in the transmission's high-pressure hydrostatic circuit has overheated.

• 309 Vario COM III
• 310 Vario COM III
• 311 Vario COM III
• 312 Vario COM III
• 922 Vario COM III
• 924 Vario COM III
• 927 Vario COM III
• 930 Vario COM III
• 933 Vario COM III
• 936 Vario COM III
• 300 Vario
• 400 Vario
• 700 Vario
• 800 Vario
• 900 Vario

1. 1

   Halt operation immediately to prevent catastrophic damage to the hydrostatic pump and motor.

2. 2

   Check oil condition by pulling the transmission dipstick; if the oil smells burnt or acrid, it has genuinely overheated.

3. 3

   Monitor live data using the Variotronic Ti diagnostics terminal (Terminal A008) for 'Temperature sensor discharge B009'. If the tractor has been sitting overnight and reads >110°C, the sensor or wiring is defective.

4. 4

   Inspect the transmission oil cooler for heavy soiling or blockages.

5. 5

   Check for concurrent fault codes like 04.1.58 (Transmission slip monitor), which indicates the transmission is slipping and generating excess heat.

1. 1

   Reduce load

   If the overheating was caused by prolonged heavy traction work, reduce the load by switching to a lower driving mode (Mode I).

2. 2

   Increase engine speed

   Increase engine speed above 1400 rpm to improve cooling efficiency and avoid unnecessary clutch pedal depression.

3. 3

   Clean oil cooler

   Thoroughly clean the transmission oil cooler.

4. 4

   Drain oil and replace filter

   If the oil smells burnt, do not just top it up. Drain the transmission oil completely and replace the transmission oil filter.

5. 5

   Refill transmission fluid

   Refill with the approved fluid (e.g., Fendt Extra Trans 10W-40 or STOU oil, viscosity SAE 10W-40 or 15W-40).

6. 6

   Locate sensor

   Locate the B009 Discharge Temperature Sensor on the transmission high-pressure circuit block.

7. 7

   Inspect and repair wiring

   Inspect the wiring harness and connector for chafing, melting, or corrosion. Repair any damaged wiring.

8. 8

   Replace sensor

   If the wiring is intact but the live data reading is implausible, replace the B009 thermo switch/sensor.

9. 9

   Clear codes and test drive

   Clear the fault codes via the Variotronic terminal and test drive the tractor while monitoring the live temperature data.