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 BuyAutoParts.com
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What is a Wheel Hub?
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: http://www.buyautoparts.com/howto/repair-wheel-hubs.htm
2. What is a
Wheel
Hub?
source: http://www.buyautoparts.com/howto/what-is-a-wheel-hub.htm
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: http://www.buyautoparts.com/howto/what-is-a-wheel-hub.htm
4. Checking
A Hub
Unit
Bearing
source:
http://www.buyautoparts.c
om/howto/checking_a_hu
b_unit_bearing.htm
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: http://www.buyautoparts.com/howto/checking_a_hub_unit_bearing.htm
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: http://www.buyautoparts.com/howto/checking_a_hub_unit_bearing.htm
7. Checking
A Hub
Unit
Bearing…
source:
http://www.buyautopa
rts.com/howto/checkin
g_a_hub_unit_bearing
_2.htm
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: http://www.buyautoparts.com/howto/checking_a_hub_unit_bearing_2.htm
9. Wheel
Hub Unit
Install
source:
http://www.buyautopa
rts.com/howto/wheel_
hub_unit_install.htm
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: http://www.buyautoparts.com/howto/checking_a_hub_unit_bearing_2.htm
11. Wheel
Hub Unit
Install 2
source:
http://www.buyautopa
rts.com/howto/wheel_
hub_unit_install_2.htm
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: http://www.buyautoparts.com/howto/checking_a_hub_unit_bearing_2.htm
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. What is a Wheel Hub?
The End
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