SACHS Workshop tip:

Greasing the hub Spline of Clutch Disks.

Why you should grease the hub spline of passenger cars and commercial vehicles

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.

Find related service informations

If the hub spline is not greased, then tribocorrosion can occur.

Use a Little Grease: The VOX Car Doctors in the “Technical Clip”

The VOX Car Doctors visited ZF Aftermarket at Automechanika 2014. Celebrity TV mechanics Hans-Jürgen Faul and Holger Parsch demonstrate how to grease a clutch disk properly in the video.

Show video now

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.

Lightly grease the hub spline of the clutch disk and the transmission input shaft.

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.

Related SACHS tool

SACHS Lateral Run-Out Testers for Passenger Cars and Trucks

SACHS offers lateral run-out testers for clutch discs with diameters of up to and starting from 240 mm, depending on whether passenger car or truck clutches need to be tested.

All about SACHS lateral run-out testers

The correct lubricant is important

Not every lubricant is suitable. It has to be temperature-resistant and withstand high surface pressure. Unsuitable lubricants can become liquid, solidify, become resinous or burn, causing malfunctions. Every SACHS clutch kit is supplied with a lubricant pad which is sufficient to lubricate the hub splines once. This high-performance grease optimally meets requirements.

Both products shown can be found in the online catalog WebCat. Enter the corresponding part numbers in the search box at the bottom edge of the browser. These are:

4200 080 050 for the tube with 80 g content for multiple uses
42000 80 060 for the lubricant pad with 1 g content for one-time use

SACHS high-performance grease with lubricant pad and tube

Service information for SACHS products

We provide service informations on SACHS products for download free of charge and in more than 25 languages. This includes technical Informations, support for spare part installation and removal as well as tips on how to avoid damage on the product.

Find related service informations