TRUCK SERVICE MANUAL
WHEELS, RIMS, TIRES
OIL SEAL INSTALLATION
(OIL SEAL WITH AXLE RING)
Remove burrs from inside back edge of hub. Hub must
be smooth and free from burrs that will scratch the hub
Apply a thin coat of Permatex No. 2 around the
outside perimeter of hub seal. Permatex coating must
be very light yet cover press fit area. Remember that
Permatex is abrasive and should never be allowed to
contact lip of leather seal nor contaminate oil.
Lay wheel flat with brake drum up. Place inner wheel
bearing into bearing cup and place hub seal into
starting position on hub.
Install hub seal using SE-1904 Installer Set (Fig. 6).
Select the size disc which will apply force to outer edge
of hub seal and prevent seal from becoming distorted
Drive hub seal into hub until it bottoms in hub bore. Do
not continue to drive after seal is once seated as this
will distort or damage the seal. After removal of seal
installer tool, clean off excess Permatex (for proper
installation, note Fig. 7).
UNITIZED OIL SEAL
(AXLE RING NOT REQUIRED)
Unitized oil seals do not require axle rings (wipers) and
minimize wear on the axle spindle as follows. The outer shell
of the seal being pressure fit in the wheel hub rotates with the
wheel around the sealing element which is pressure fit on the
axle spindle. With the unitized seal when replacement is
made, the worn surface created by the sealing lip is also
CTS-2032N Page 4
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