Multi-plate clutch plates

Multi-plate clutch discs in Fendt tractors

Multi-plate clutch discs in Fendt tractors, like in other agricultural vehicles, are part of the clutch system that allows for the transfer of torque from the engine to the drive system. The multi-plate system is characterized by using several discs that operate simultaneously, distributing forces over a larger surface area instead of just one clutch disc.

Construction of the multi-plate clutch disc

1. Friction discs (linings):

   • These are discs that have friction linings (made from wear-resistant materials) that adhere to the metal carrier discs, creating a friction zone and transferring torque from the engine to the drive. The friction linings can be made from composites, ceramics, or other materials that provide high wear resistance.

2. Carrier discs (metal):

   • Metal carrier discs are located between the friction discs and serve as supports. In multi-plate clutches, the carrier discs do not have friction linings but serve a load-bearing function, allowing the friction discs to rotate.

3. Pressure springs:

   • To ensure adequate pressure on the discs, pressure springs (often disc or spiral) are used. These springs evenly distribute the clamping force, ensuring effective engagement and disengagement of the clutch discs.

4. Release ring:

   • An element that provides the appropriate clamping force on the discs and helps in their even pressing against the flywheel.

Operating principle of the multi-plate clutch in Fendt tractors

In Fendt tractors, the multi-plate clutch operates on the principle of simultaneous engagement and disengagement of multiple discs. When the clutch pedal is pressed, the pressure springs relieve the clutch discs, allowing the engine to disconnect from the drive system, enabling gear changes or stopping the machine. Upon releasing the clutch pedal, the clutch discs are pressed together again, transferring torque from the engine to the drive system.

Advantages of the multi-plate clutch in Fendt tractors

• Higher efficiency: With multiple clutch discs, it is possible to transfer greater torque, which is particularly important for high-power engines, such as those installed in Fendt tractors.
• Smooth operation: It operates more smoothly and evenly compared to single-plate clutches, which translates to better working comfort in challenging agricultural conditions.
• Durability: Distributing the load over several discs makes the clutch less prone to excessive wear, extending its lifespan.

Symptoms of wear on multi-plate clutch discs in Fendt tractors

Wear on multi-plate clutch discs can lead to various issues with the drive system's operation. Here are symptoms that may indicate the need for disc replacement:

1. Difficulty in engaging gears:

   • Wear on the friction linings of the discs can cause difficulties in fully disengaging the clutch, resulting in delays or problems with engaging gears, especially when working in the field or under heavy loads.

2. Clutch slip:

   • If the clutch discs do not engage effectively, slipping may occur, which manifests as the engine reaching higher RPMs, but torque is not adequately transferred to the drive system. This can lead to power loss and decreased tractor efficiency.

3. Jerkiness or vibrations:

   • Worn discs can cause uneven engagement or disengagement of torque, leading to jerkiness or vibrations during gear changes or while starting.

4. Noise:

   • Over time, the discs may wear down enough to start "scraping" against each other or other components, causing characteristic noise (e.g., squeaking or knocking) during clutch operation.

5. Reduced clamping force:

   • Reduced effectiveness of the pressure springs or other mechanical issues can lead to decreased clamping force on the discs, resulting in poorer engagement.

How to replace multi-plate clutch discs in Fendt tractors

Replacing multi-plate clutch discs in Fendt tractors is a complex process that requires experience and precision. Here is a general process for replacement:

1. Preparing the tractor

• Securing the machine: Before starting the replacement, ensure that the tractor is immobilized and stable. Engage the handbrake and lift it on an appropriate jack.
• Disconnecting the battery: Always disconnect the battery before starting work on the electrical system.

2. Dismantling shields and components

• Remove any shields or parts that block access to the clutch system, such as shaft shields, hydraulic system components, fuel tanks, etc.

3. Dismantling the gearbox

• To access the clutch system, you will need to dismantle the gearbox. Remove the bolts securing the gearbox and carefully take it off the drive shaft. This may require the use of specialized tools.

4. Removing the old clutch

• After removing the gearbox, you will gain access to the clutch system. Unscrew the bolts securing the clutch pressure plate and remove the multi-plate clutch discs. Pay attention to their order and arrangement.

5. Checking the condition of the flywheel and pressure plate

• Check the condition of the flywheel and pressure plate. If they are uneven, they may require repair or replacement. Ensure everything is in good condition before installing new parts.

6. Installing new clutch discs

• Install the new clutch discs, ensuring they are correctly arranged. Remember to maintain the proper order of friction and metal discs. Ensure that the discs are evenly pressed, and the pressure springs distribute the pressure correctly.

7. Reinstalling the gearbox and other components

• After installing the new clutch discs, reinstall the gearbox and other parts that were previously removed.

8. Testing the clutch system

• After completing the assembly, start the tractor and check the operation of the clutch. Check if the gear changes are smooth, and if there are no jerks, noises, or other irregularities.

Summary

Multi-plate clutch discs in Fendt tractors are a key component of the drive system that enables effective torque transfer. Wear on these discs can lead to issues with gear engagement, slipping, jerkiness, or noise. Replacing the clutch discs requires precise dismantling of the gearbox and other components, as well as ensuring proper installation of new parts. Regular maintenance of the clutch helps extend its durability and ensures reliable operation of the tractor.