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Wheel end disassembly
Follow vehicle manufacturer’s recommended procedure to remove
tire and wheel assembly, disk brake caliper, dust cap, cotter pin,
adjusting nut and washers. Pull rotor toward you to loosen outer bearing
cone, then remove the outer bearing cone. Pull the rotor and assembly
off the spindle; the inner bearing cup and seal will come with it.
To remove the inner cone, use a seal puller or pull out the inner
seal. Discard the seal after removal. Remove the cups from the housing
with a steel bar. |
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Clean and inspect hubs
and spindles Remove all old lubricant from rotor/hub assembly and
spindle, then clean them with kerosene or mineral oil. Inspect spindle
for scoring, bending, thread or other damage. File off nicks and burrs.
Follow manufacturer’s recommendation for permissible spindle
wear. A light grease coating on the cone seats will make installation
easier and prevent fretting. |
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Install cup
Use a cup driver or mild steel bar to press or drive the new cup into
the hub until it is solidly seated against the hub shoulder. Be careful
not to damage the cup surfaces. Never use a cone to drive a cup. |
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Lubricate
Pack cones fresh from carton. A pressure grease packer is recommended.
To hand pack cones, force grease under the cage between the rollers
from the large end of the rollers until it shows at the small end.
Fill the hub with grease to the inside diameter of the outer races
and fill hub grease cap. This layer combats moisture and retains grease
in cones.
WARNING: Failure to correctly lubricate bearing
and maintain proper lubrication may result in damage that could cause
wheel to lock or come off during operation, creating a risk of serious
bodily harm. |
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Install grease seal
Grease seals must be replaced when they leak or when bearings are
being repacked or replaced. Install inner cone in hub, then the seal.
Make sure the seal lips are pointed in the right direction. Use the
proper seal installation tool. |
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Install rotor/hub assembly
Slide the rotor/hub assembly back over the spindle, being careful
not to damage the seal against the spindle. Insert the grease-packed
outer cone, washer and adjusting nut. |
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Adjust bearing
Use a 12” wrench to tighten the adjusting nut while turning
the rotor. When the rotor binds slightly, all the bearing parts are
seated properly. Back off the nut 1/6 to 1/4 turn or sufficiently
to allow 0.001” to 0.007” end play. Then lock the nut
with a new cotter pin.
WARNING: Failure to back off the adjusting nut
may cause the bearing to run hot and be damaged, which could cause
wheel to lock or come off during operation, creating a risk of serious
bodily harm. |
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Check bearing adjustment
Use a dial indicator to measure end play. Mount the indicator base
as close to the center of the hub/ rotor as possible. With the indicator
tip against the end of the spindle, set the indicator at zero. Grasp
the rotor at three o’clock and nine o’clock. Push the
rotor in while oscillating and read the dial indicator. Then pull
the rotor out while oscillating and read the dial indicator again.
The bearing endplay is equal to the total indicator movement. Reinstall
all components as manufacturer recommends.
Warning: Failure to follow recommended
procedure for removal and installation may cause damage resulting
in wheel locking or coming off during operation, creating a risk of
serious bodily harm. |
