Mercedes-Benz A220 2020 Page 112
Wheels - Checking Components For Bolted Wheel Connection
Date: May 19, 2011
Order No.: S-B-40.10/72
Group: 40
SUBJECT: MY-All, Models All
Checking Components for Bolted Wheel Connection
Incorrect installation of and/or incorrect contact surface cleaning methods of bolted wheel connections can lead to the loosening of the
wheel-and-tire assembly, which can result in injury to people, property, or the environment.
To avoid this the wheel-and-tire assembly must be fitted following all operation steps that follow.
Procedure
A. Cleaning
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1. Remove lubricants and soiling, such as oil, grease or sand from the following components:
^ Contact surfaces
^ Joints and centering on disk wheel
^ Wheel hub
^ Wheel flange
^ Brake disk
^ Brake drum
^ Spherical caps on disk wheel
^ Thread and radius seat of wheel bolts
^ Thread for wheel bolts and in wheel hub or wheel flange
2. Remove corrosion with a wire brush or emery cloth.
3. Clean any contaminated threads. Remove all corrosion and dirt from corroded threads using tap. There must be no damaged or missing threads.
Any dirt left in the thread prevents reaching specific torque value. The cleaned contact surface should look like Figure 4.
B. Inspecting
1. Check the following for damage:
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^ Contact surface, joints and center on disk wheel
^ Wheel hub
^ Wheel flange
^ Brake disk or brake drum
^ Spherical caps for deformity and rim flanges on disk wheel
^ Threads and radius seat of wheel bolts
^ Thread for wheel bolts in wheel hub or wheel flange
2. Replace wheel bolt or wheel flange if thread is damaged. Replace disk wheel, wheel flange, brake disk or brake drum if damaged.
3. Check radius seats of wheel bolt for signs of damage, scoring marks and material deposits. Replace any wheel bolts that are damaged, scored, or
have material deposits. Any remaining sizing marks or material deposits will prevent reaching specific torque value.
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4. Apply corrosion protection. Apply a thin coating of long-life grease as corrosion protection to the marked area of the center hole guides (see
arrow, Figure 7) on the wheel hub, wheel flange, and wheel contact surface. Do not apply grease or any other lubricant to the threads of wheel bolts,
wheel hubs, wheel flanges, or wheel studs.
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