The clutch will only work perfectly over the long term if the hub spline is optimally greased.
If the clutch disk is not greased correctly when it is installed, tribocorrosion may occur in the hub spline. In this case, the clutch disk will seize instead of sliding along the transmission input shaft. ZF Aftermarket emphasizes that the hub spline must always be greased correctly.
How-to-guide
The correct procedure for greasing the hub spline
Lightly grease all around the hub spline of the clutch disk and the transmission input shaft with SACHS high-performance grease. Now the clutch disk is moved back and forth along the transmission input shaft, and then the excess grease is removed from the transmission input shaft and from the hub spline.
Note: If too much grease is used, centrifugal forces will transfer it onto the clutch linings during operation. Linings soiled in this way will cause the clutch to grab or chatter during operation.
Before installing the clutch disk, check its lateral run-out, which may be a maximum of 0.5 mm. Larger values can cause drag.
Nice-to-know
The VOX Car Doctors visited ZF Aftermarket at Automechanika 2014. In this video, celebrity TV mechanics Hans-Jürgen Faul and Holger Parsch demonstrate how to grease a clutch disk properly.
ZF Aftermarket product range
Discover the complete portfolio of clutch systems in our product catalog.
