AFT_B009

SEPTEMBER 2020 AFTERMARKET 41 www.aftermarketonline.net First, make sure you have the correct part. Selecting the incorrect bearing is a common mistake. If the bearing is selected correctly, it can be re- checked quickly using the NSK online catalogue: https://bit.ly/2BU5FEK If you are sure you have the right part, you can begin. Avoid damage to the magnetic encoder Some hub bearings feature a magnetic encoder for the ABS signal, and thus demand even closer attention. The encoder seals contain many north (N) and south (S) poles which are read by the speed sensor. If the N+S poles are damaged during installation it can lead to failure of the ABS system. Technicians can identify if a hub bearing has an encoder by using an NSK test card. The same test card can also be used to establish whether a fitted bearing has pole damage if the result does not look like Fig. 2, which can help identify ABS signal problems. Keep the encoder from magnets and dirt Avoid coming into contact or getting near the encoder with tools like spanners and screwdrivers as they can change the N+S poles, leading to issues with the ABS signal. Only remove the bearing from its protective packaging immediately before fitting. Ensure correct encoder orientation Encoders are only present on one side of Hub I generation wheel bearings – as identified by the test card – so it is vital to get the orientation correct when pressing into the knuckle. Before beginning this operation, always check that the encoder surface will be adjacent to the sensor after assembly. Avoid pressure on the encoder surface For pressing, use a tool that only contacts the end face of the outer ring on Hub I generation bearings (see Fig. 3). Never press on the encoder seal and never press on the inner ring as it will lead to bearing failure within a few kilometres of use. Once a suitable tool has been selected, keep the bearing aligned to the bore and press it vertically into the knuckle. Further tips There are many general tips to keep in mind throughout the process, such as taking care of all suspension parts to avoid any unnecessary damage. Additionally, to ensure correct fitting of the bearing, it is important to control the hub and knuckle during assembly, while all surfaces which come into contact with the bearing should be cleaned beforehand (See Fig. 4 and Fig.5). . Finally, for safe reassembly, only use only tightening torques recommended by the VM. In particular, it is known that applying excessive torque to the CVJ nut can lead to bearing damage (see Fig.6). NSK has also produced a video that shows the process: https://bit.ly/3i2hY1l Hub bearings can be tricky to install, which is why NSK is providing some extra tips to help avoid common mistakes. NSK: TIPS FOR REPLACING WHEEL HUB BEARINGS Fig.1 Fig.2 Fig.3 Fig.4 Fig.5 Fig.6

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