Brakes/Traction Control - Handling Multipole Rings
Date: December 19, 2011
Order No.: P-B-42.30/118
Group: 42
SUBJECT: Models 129, 140, 170, 171, 172, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 216, 218, 219, 220, 221, 230, 231
Handling Multipole Rings
When repairing and maintaining operations on the rear axle, ensure that there is no mechanical and magnetic damage to the multipole rings on the
external ball joint of the drive shafts, and that all work conducted is performed in accordance with the WIS documentation specifications.
To avoid magnetic damage to the multipole rings everyone who comes into direct contact with the components must familiarize themselves with the
following specifications for handling multipole rings. This applies to the following components:
^ Drive shaft
^ Steering knuckle/wheel bearing
^ Spring control arm
^ Transverse control arm
^ Cross strut
^ Torque strut
^ Thrust arm
^ Camber strut
^ Shock absorber
^ Spring
Note the following precautions when handling these magnetic multipole rings:
Mercedes-Benz A220 2020 Page 85
^ Do not bring into contact with external magnetic fields (Figure 1) (a).
^ Avoid damaging rubber-lined encoder track (Figure 1) (b).
^ Avoid soiling parts (Figure 1) (c)
^ Do not bring into contact with metal shavings (Figure 1) (d).
Installation instructions for multipole rings are in WIS document AR42.30-P-0715A Remove/Install Pulse Ring.
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