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4-10 WHEEL BEARING LUBRICATION AND ADJUSTMENT
With trailer sitting level, the oil level must be
checked daily and maintained between the "ADD"
and "FULL" lines on the hub cap window. Check
for cracked windows, missing filler plugs, and oil
leaks. Add hub oil through the "POP-IN" filler plug
located in the center of the hub windows. Re-install
the "POP-IN" plugs after filling each hub. Adjust
wheel bearings and change oil every 50,000 miles
or with each brake lining replacement, which ever
occurs first.
4-10.1
Adjustment
a. With a drain pan under the hub cap, remove
the hub cap assembly allowing oil to drain.
b. Lift the wheel off of the ground.
c. Adjust slack adjuster to eliminate brake drag
during tire/wheel rotation.
d. Remove outer lock nut and inner nut and
lock washer.
e. Tighten the inner adjustment nut to a mini-
mum of 75 ft.-lbs., while rotating wheel to in-
sure proper seating of the bearings and cups
in the wheel hub.
f. Loosen the inner adjustment nut so that the
wheel will turn freely.
4-22
g. Retighten the inner adjustment nut to 50
ft.-lbs. while rotating the wheel, to properly
position the bearings for the final adjustment.
h. Loosen the inner adjustment nut 1/3 turn.
i.
Install the spindle nut lock washer so that
the dowel on the inner nut will align with a
hole in the lock washer and the washer tang
fits in the spindle keyway.
j.
Install the outer lock nut and tighten to 250-
300 ft.-lbs. End-play of .001" to .010" must be
present in the adjusted wheel bearing assem-
bly.
DANGER
FAILURE TO TORQUE THE OUTER
LOCK NUT PROPERLY COULD CAUSE
THE WHEEL TO COME OFF DURING
VEHICLE OPERATION RESULTING IN
PROPERTY DAMAGE OR LOSS OF
LIFE.
k. Install the hub cap with a new gasket and fill
with oil to the full mark. See Table 4-1.
l.
Adjust brakes according to See Section
4-8.5-c.
m. Check hub oil level after the wheel has set
level in one position for a few minutes to allow
the oil to work into the bearings.
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