Case IH F81 – Transmission Controller (TCU / Transmission ECU): Clutch Slipping

The transmission controller has detected a slip in the transmission clutch pack. This is a mechanical or hydraulic failure warning, meaning the clutch is failing to hold the commanded gear under load.

• MXM
• MXM Series (120, 130, 140, 155, 175, 190)
• Maxxum
• Puma
• Steiger
• TM Series (TM115-TM165)
• T6000
• T7 Series

1. 1

   Verify Fluid Levels: Check the transmission/hydraulic oil level and ensure the correct fluid is being used.

2. 2

   Recalibrate Clutches: Run the transmission calibration procedure via the H-Menu. If the clutches are uncalibrated, the TCU cannot apply the correct engagement pressure.

3. 3

   Test Solenoids and Valves: Check the transmission clutch solenoids for proper operation. Look for accompanying electrical fault codes (e.g., F1A through F1E for open/shorted clutch solenoids).

4. 4

   Hydraulic Pressure Test: Test the hydraulic pressure at the clutch pressure switches. A drop in pressure is often caused by internal oil leakage through defective seals (O-rings on piping, pistons, or seal segments).

1. 1

   Drain Fluid

   Drain the transmission/hydraulic fluid from the tractor.

2. 2

   Access the Transmission

   Depending on the model (e.g., Maxxum vs. Steiger), split the tractor or remove the transmission housing to access the affected clutch pack.

3. 3

   Inspect and Replace Seals

   Inspect the internal piping, clutch pistons, and seal segments. Replace all defective O-rings and seals, as these are the primary cause of pressure drops leading to slip.

4. 4

   Rebuild the Clutch Pack

   Remove the burnt/worn friction discs and separator plates. Install a new clutch pack kit.

5. 5

   Reassemble and Refill

   Reassemble the transmission housing and refill with the OEM-specified hydraulic/transmission fluid.

6. 6

   Final Calibration

   You must perform a full transmission calibration using the tractor's electronic configuration menu so the TCU can learn the engagement points of the new clutch plates.