Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

What is a Wheel Hub?


Published on

This presentations describes what a wheel hub is, how to repair a wheel hub, how to inspect a hub unit bearing, and how to install a wheel hub. For more auto parts information checkout the rest of the presentations from

Published in: Automotive
  • Login to see the comments

What is a Wheel Hub?

  1. 1. What is a Wheel Hub? What is a wheel hub? How to check a hub bearing unit? And How to install a Wheel Hub?source:
  2. 2. What is a Wheel Hub? source:
  3. 3. What is a Wheel Hub?• A wheel hub is the mounting assembly for the wheel of a vehicle, it houses the wheel bearing as well as supports the lugs. Most newer vehicles will also have a speed sensor and ABS sensor attached to the unit through an electrical connector. The function of the wheel hub is to keep the wheel spinning freely on the bearing while keeping it attached to the vehicle. The wheel hub is the only part that actually holds the wheels to the car so it is very important that special attention be paid when these parts are being installed. source:
  4. 4. Checking A Hub Unit Bearing source: b_unit_bearing.htm
  5. 5. Checking A Hub Unit Bearing• It can be a challenging task to properly diagnose a damaged hub unit bearing. This information will help you to recognize common causes of noise generation and know how to examine a hub unit bearing.• The first step is to verify the source of any unfamiliar noise. Often this can be attributed to road surface conditions such as newly paved roads or roads with uneven surface characteristics, which can cause unusual and intensified noises. The thread design, composition and wear patterns of vehicle tires can be another source of unfamiliar noise. Unusual wear patterns are generally caused by lack of tire rotation poor alignment, improper pressure or worn suspension parts. After eliminating noise generation caused by road surface conditions, tire design and wear patterns, it’s time to make a more detailed examination of the wheel assemblies as well as the hub unit bearings. source:
  6. 6. Checking A Hub Unit Bearing, cont.• Prior to checking a hub unit bearing, make sure you have the proper tools.• Perform a hand rotation check on the wheel. Next, grasp the wheel at the 3 o’clock and 9 o’clock positions. Push while oscillating and also pull while oscillating the wheel. Perform a second check, following this same procedure, grasping the wheel at 12 and 6 o’clock positions. In addition, listen and feel for roughness. After making all preliminary inspections, check the hub unit bearing more precisely.• If applicable, remove the wheel cover to access the lug nuts. Remove the lug nuts and the wheel and tire assembly. Next, remove the caliper from the caliper mounting bracket. To prevent damage to the brake line due to the weight of the caliper, make sure the caliper is properly supported with either an “S” hook or a piece of wire.• Remove the caliper mounting bracket and then remove the brake rotor. source:
  7. 7. Checking A Hub UnitBearing… source: _2.htm
  8. 8. Checking A Hub Unit Bearing, cont.• The next step is to inspect the hub unit by trying to wobble the unit by hand. If the unit is loose the bearing may be damaged, the axle nut may have backed off or the axle nut may not have been properly clamped.• Check the gap on the hub and make sure the bearings internal clearance is correct. Next a dial indicator base should be secured before the test is begun. Now grasp the wheel hub at 3 and 9 oscillating the hub side to side by about 90 degrees. Do this five times to properly set the bearings. Observe the indicator during this procedure and if it exceeds 0.004" then the hub bearing needs to be replaced.source:
  9. 9. WheelHub Unit Install source: hub_unit_install.htm
  10. 10. Wheel Hub Unit Install• Timken continues to lead the hub unit bearing evolution by providing assemblies that are uncompromised in quality, reliability, and consistency. Proper hub unit bearing removal and installation procedures can enhance the performance and life of hub units, bearings, axles, wheels, brakes, and other components. Following are guidelines for removing and installing a hub unit bearing on a passenger car front wheel-end application.• 1. Inspect the surface of the axle shaft, spline teeth and tone wheel for wear. Use a fine file, wire brush, emery cloth or honing stone as appropriate to remove any debris, nicks, or burrs.• 2. Carefully check the positioning of the splines on the axles shaft while installing the steering knuckle. The proper positioning of these two components is critical so that the splines are not damaged. (Note: Never force the hub unit bearing onto the shaft or strike with a hammer.)• 3. Install the strut mounting bolts that attach the steering knuckle to the strut assembly and torque them to the vehicle manufacturer’s specifications using a torque wrench.• 4. Install the bolts that attach the lower ball joint to the lower control arm and torque them to the vehicle manufacturer’s specifications using a torque wrench.• 5. Attach the lower ball joint to the lower control arm and install the nut. Torque the nut to the vehicle manufacturer’s specifications using a torque wrench.source:
  11. 11. WheelHub UnitInstall 2 source:
  12. 12. Wheel Hub Unit Install 3• 6. Secure the nut using a new cotter pin.• 7. If applicable, be sure to properly attach the ABS sensor cable to the vehicle. Connect the sensor to its mating connection point.• 8. Ensure that the brake rotor, caliper mounting bracket and caliper are free from debris and burrs. Install the brake rotor. Follow the vehicles manufacturer’s recommendations for rotor inspection and reuse.• 9. Install the caliper mounting bracket. Torque the bolts to the vehicle manufacturer’s specifications.• 10. Next, install the caliper on the caliper mounting bracket, being careful not to damage the rubber boots. Place the manufacturer’s recommended lubricant on the caliper bolts. Install the bolts to the vehicle manufacturer’s torque specifications.• 11. Prior to installing the axle nut, apply the brake to prevent axle rotation or damage to transmission and transaxle components. This can be accomplished by using either a brake pedal depressor or having an assistant depress the brake pedal.• 12. Install the axle nut. Follow the vehicle manufacturer’s instructions for proper tightening of the axle nut.• 13. Secure the axle nut with the locking procedure specified by the vehicle manufacturer.• 14. Replace the wheel and tire assembly. Install the lug nuts. Follow the vehicle manufacturer’s instructions for lug nut tightening sequence, torque specifications and if applicable, re-torque requirements.source:
  13. 13. Disclaimer• Warning: Proper maintenance and handling procedures are critical. Always follow installation instructions and maintain proper lubrication. Never spin a bearing with compressed air. The rolling elements may be forcefully expelled. This information is not intended to substitute for the specific recommendations of your equipment suppliers.
  14. 14. What is a Wheel Hub? The EndFor more Auto How To Tips visit, you need to purchase an auto part- Visit Call 1-888-907-7225- Or send an email to THANKS source: