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GB4943.1-2022 “Audio/video, information and communication technology equipment-Part 1: Safety requirements” became effective retroactively to Aug. 1, 2022, according to Announcement No. 11/2022 issued by the Certification and Accreditation Administration of the People’s Republic of China (CNCA) on Aug. 2, 2022. Certified companies are granted a transition period of two years until July 31, 2024 to renew existing certifications to the updated standard.

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Since the wheel bearing is the sole point of contact between the car and the wheel, it’s very important that it is functioning properly. A bad bearing will be noisy, could lead to heat damage of other components, and could seize up or cause the wheel to break off the car, leaving the driver stranded.

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When it’s time to shop for a new wheel bearing, AutoZone has all the parts and tools you need to keep your car rolling, and we have locations in every state that you can find by using our Store Locator.

The Chinese GB Standards and Implementation Rules are regularly updated by the authorities, often having considerable implications for product manufacturers. Updates are usually not announced and must be independently tracked and implemented by certified factories. Failure to do so may result in severe consequences, including cancellation of certification.

All of these changes are relevant not only for certified manufacturers of corresponding devices, but also for their customers and involved suppliers.

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Audio, video, information, and communication technology devices are subject to strict regulatory requirements in China and must usually receive a CCC certification. For more than 10 years, Chinese Guobiao Standards GB4943.1-2011 and GB8898-2011 have been defining technical requirements for these products. However, many of these products now fall under the standard GB4943.1-2022.

Once you’ve done the road test and have an idea of where the sound is coming from, park your car, jack it up, and remove the tire. Don’t forget to use jack stands! With the tire off, rotate the bearing to see if there is undue resistance or if you can feel or hear clicks, grinding or other sounds coming from the bearing. It should be smooth and quiet. You can also try to wiggle it back and forth and there shouldn’t be any play in the bearing.

Wheel bearings have come a long way since the days when you had to repack them every several thousand miles, but they still do fail on occasion. Keep reading to learn how to identify a bad wheel bearing by the sounds it makes and what to do to avoid a wheel bearing to go bad.

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The requirements for the safety of battery-powered devices have been expanded, too, especially regarding protection against overcharging, high temperatures, and ignition. Here, the focus lies on avoiding hazards from external metal objects, for example, keys or necklaces.

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Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

In automotive applications, the wheel bearings are usually sealed units that connect the wheel to the suspension of the vehicle. Your wheel studs will typically be part of the bearing and if it is a drive wheel, there can be a hollow in the middle of the bearing where a spindle is inserted from the axle shaft.

Your safety should always come first. Learn the safest way to use wheel chocks and how to keep your stationary car from rolling.

Further changes concern A/V and ICT devices, which are usually operated outdoors, as well as devices with button cells, specific grounding, and many more. For example, wireless energy transmitting devices must be able to detect external metal objects and interrupt any energy transmission to them in time.

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About the author: Verena Numssen, Managing Director of MPR China Certification GmbH Publisher: MPR China Certification GmbH Tel.: +49 69 271 37 69 150 E-Mail: info@china-certification.com Web: www.china-certification.com

Numerous products in the audio, video, information, and communication technology sectors are required to have CCC Certification (China Compulsory Certification) for the Chinese market. They include computers, printers, scanners, copy machines, CD players, speakers, keyboards, televisions, monitors, and many more.

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Start by listening for clicking, humming, or growling noises and feel for vibrations through the steering wheel. If you can pinpoint where the noises are coming from, the next step is to remove the wheel and do a physical inspection.

Your wheel bearings impact efficiency and keep the wheels attached to your car, so it’s important to use the best possible parts to complete any repair. Replacing your own wheel bearings can be an afternoon or evening job, depending on the make and model of your vehicle, so do a bit of research and don’t be afraid to tackle this important repair yourself.

There are a few things to listen and feel for when attempting to diagnose a bad wheel bearing. Some of the sounds that we associate with bad bearings can also be indicators of problems with other parts of the vehicle, but there are a few tricks to test whether the noise is a bearing issue. Here are a few sounds that can indicate a bad bearing:

Back in the days of horses and carriages, wheels were attached to the carriage by way of a wooden or metal stick axle that was fixed to the carriage, requiring the wheels to rotate on the axle. A major drawback of this setup was that there was a lot of friction between the wheel and the axle, and that friction made it harder to move the carriage, resulting in wasted energy. The other issue was that the friction would cause a lot of wear and tear on the axle and wheel where they joined, so you’d need to do constant maintenance on the joint.

The overall modification of the former national standard aligns closely with the international IEC standard IEC 62368-1:2018. Some of the changes in the updated standard include the classification and assessment of various hazard sources, which have now been divided into six categories, namely: Electricity-induced injury, electricity-induced fire, injury caused by harmful substances, mechanical injury, thermal burns, as well as sound and light radiation. GB4943.1-2022 requires appropriate precautions as part of the safety engineering, depending on the hazard source.

Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.

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Some of these symptoms can also be a result of bad tires, or even a bad CV joint, but a bad bearing will sound worse when it is put under load, like when the car is turning, so use this method to test and see if it is your bearing that’s causing the noise:

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MPR China Certification GmbH will inform you as early as possible about any changes to the GB Standards and Implementation Regulations relevant to you. In the case of modifications to the content, we will be happy to check the relevance for you individually. This is enabled through our long-term relationships with the certification bodies and close coordination with the relevant authorities and test laboratories. Our services allow you to focus on your core business by protecting you from potential certification-related consequences in your China affairs.

Choose from our selection of stainless steel bearings, including ball bearings, roller bearings, and more. In stock and ready to ship.

The first caged bearings for axles were patented in the late 1700s, and the design that has carried forward to modern times is basically a set of steel balls or rollers that are housed within a ring-shaped housing called a race. Most ball bearings will have an inner race, which is grooved and holds the balls on the inside, and a grooved outer race on the outer circumference of the bearing. In a roller bearing, the race has slots that allow the rollers to spin against the axle on the inside and the wheel on the outside.

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If you catch a wheel bearing right when it starts to fail, you probably will have enough time to get to the shop or your home and do the diagnosis and repair. Be aware that driving at highway speeds will intensify any bearing issues and could lead it to fail faster, so be prudent with your route.

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About the author: Verena Numssen, Managing Director of MPR China Certification GmbH Publisher: MPR China Certification GmbH

We also know that sometimes you just don’t have the time to do the job yourself, so allow us to help you find a qualified professional mechanic through our Shop Referral Program.

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