Installation and Removal of Wheel Bearings

We are ending our series of documents on the installation of wheel bearings with bearings that are equipped with the ASB® system invented by SNR. We will be looking at the cartridge double-row ball bearing and the hub bearing.

The SNR ASB® (Active Sensor Bearing) wheel bearing contains a seal that integrates a multi-pole magnetic encoder. As soon as the wheel starts to rotate, this magnetic encoder actuates a close-by miniature active sensor that delivers an electric signal. The frequency of this signal is proportional to the wheel speed-of-rotation. The information is therefore reliable, even at very low speeds. Compared with conventional system of passive speed sensing via a tone wheel, the ASB® concept permits to save weight and space, and simplifies wheel assembly.

1. Remove in sequence:
- the driveshaft nut,
- the brake caliper
- the brake rotor
- the sensor attached to the steering knuckle by a screw. Disengage the driveshaft and remove the steering knuckle
2. Place the steering knuckle on either a tube or chucks. Using a sleeve of appropriate diameter, apply pressure to the hub to drive it out of the steering knuckle.
3. During this operation, the bearing separates into two parts: one inner ring stays on the hub, while the rest of the bearing remains in the steering knuckle.
4. If the ball train is still on the hub, remove it. To remove the inner ring, use a knife extractor that will be positioned and clamped into the pulling groove of the bearing inner ring. If the inner ring does not have such a groove, apply pressure between the face of this ring and that of the hub.

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