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Wheel Bearing Along With Hub Assemblage

By Author: delvincamm
Total Articles: 5

Wheel hub assembly (WHA), also referred to as hub assembly, wheel hub unit, wheel hub bearing, etc., is an automotive part used in most cars, passenger vehicles and light and heavy trucks.

It is located between the brake drums or discs and the drive axle. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure.

Locking hubs, also known as freewheeling hubs are an accessory fitted to many four-wheel drive vehicles, allowing the front wheels to be manually disconnected from the front half shafts.

Because many 4WD vehicles, especially heavy duty 4×4 trucks, do not have a center differential or equivalent (e.g., a viscous coupling), they should be used in 4WD mode only when traction is limited: small differences in rotational speed between the front and rear wheels that occur when driving in 4WD on a dry, hard surface (such as pavement) cause a torque to be applied across the transmission, a phenomenon known as transmission wind-up can occur, and can cause considerable damage to the transmission or drive train; on loose surfaces (dirt, snow, mud, gravel), these rotational speed differences are absorbed by tire slippage.

Consequently, most 4-wheel-drive vehicles are fitted with “part-time” 4WD systems: they can be switched from 2-wheel-drive mode (“2WD”), where only the rear wheels are driven by the drivetrain, to 4-wheel-drive mode (”4WD”), where all 4 wheels are driven by the drivetrain. Many of these vehicles will spend most of their time in 2WD: locking hubs allow the parts of the drivetrain that are used for 4-wheel-drive to be disconnected. With the hubs disengaged, and the transfer case in 2WD, the entire front axle and differential are inactive.

Suggested benefits of locking hubs include better fuel efficiency, quieter operation, less vibration, and lower wear; however, there are no reliable scientific studies to prove these claims. Exactly how great these benefits are is open to debate, with many feeling that they are outweighed by the disadvantages below.

In older vehicles, manual locking hubs are used to disengage the front wheels. This requires getting off/out of the vehicle to engage or disengage the front wheels. If road conditions are irregular (snow, then dry pavement, then snow again, repeatedly), these vehicles can be used in 2WD mode with the locks engaged (by disengaging 4WD with the lever or switch INSIDE the vehicle) and 4WD needs only to be engaged from inside the vehicle when road conditions require it.

Making your cars wheel bearing and hub assembly handling more comfortable is a great idea, but spending unknowingly on wheel alignment and hub assembly on every service may not get your car out of the handling issue. There are few important lessons to learn, before opting for wheel bearing alignment. For more information visit our site.

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