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Technical Service Bulletin # Mercedes Benz Truck GL 550 LI33-25_P-0514013 Date: 130409

Technical Service Bulletin # Mercedes Benz Truck GL 550 LI33-25_P-0514013 Date: 130409

Wheels/Tires - Hard Metallic Knock from Front Wheel Bearing Are

Hard, metallic knock from area of wheel bearing on front axle when cornering slowly or while parking

Topic number L133.25-P-051401

Version 1

Design group 33.25 Axle housing, stub axle

Date 04-09-2013

Validity Model 164 as of VIN 164 ###.#A 557 500

Model 251 as of VIN 251 ### #A104835

Reason for change

Complaint:

When negotiating a gentle corner at walking pace (5-8 km/h) or while parking / maneuvering, a single, loud metallic knock is heard from the area of

the wheel bearing on the front axle.

Cause:

Wheel bearing bore in steering knuckle may not have sufficient press fit, therefore insufficient overlap between wheel bearing outer race and steering

knuckle.

Micro-movements result in the relevant noises.

Remedy:

Replace steering knuckle with wheel bearing.

In the case of follow-up repairs (steering knuckle already replaced), only replace the wheel bearing and secure it using "Loctite 648"

Note:

Use the Chassis Ear to facilitate diagnosis.

Experience has shown that in many cases the noise is caused only by the steering knuckle on the left-hand side in the direction of travel.

For this reason repair the left-hand side first.

To date we are only aware of problems occurring on vehicles produced from October 2009 onwards.

2011 Mercedes Benz Truck GL 550 (164.886) V8-5.5L (273.963) Page 138