4-26
F-473-0212 Edition
MAINTENANCE AND LUBRICATION
Wheel Bearing Lubrication and
Adjustment
With semitrailer 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 per
or with each brake lining replacement, whichever occurs
first.
Adjustment
1.
After properly installing the bearings and seals
according to the manufacturers's recommendations,
tighten the inner spindle nut to 100 ft. lbs. while
rotating the hub to insure proper seating of the
bearings, cups, and seal in the wheel hub.
CAUTION
2.
Loosen the inner spindle nut to remove pre-load
torque.
3.
Hand tighten the inner adjustment nut, then back off
1/4 turn, 3/8 turn maximum.
4.
Install lock ring (lock ring must engage pin on inner
spindle nut. Nut to engage nearest pin hole).
5.
Install tab washer and outer lock nut. Torque outer
spindle nut to 250 - 300 ft. lbs. Bend three tabs over
outer nut flats to secure.
6.
This procedure should assure an end-play of .001” to
.010” which must be present in the adjusted wheel
bearing assembly
DANGER
You must follow the maintenance procedures to
prevent damage to important structural
components. Damage to certain structural
components such as wheel bearings can cause
the wheel end to come off of the axle. Loss of a
wheel and while the trailer is moving can cause
you to lose control and lead to an accident, which
can result in serious injury or death.
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.
