4-52. Wheel and Hub Assembly
burrs on bead rim, and other damage. Remove all burrs
a. Removal and Disassembly.
with a file or fine stone. Replace damaged wheels.
(5) Inspect the bearing cones for rough, scored,
disassemble the wheel and hub assembly as shown in
or brinnelled rollers, scored races, and bent cages.
figure 4-32. Note the following:
Inspect the bearing cups for wear and scoring. If either
(1) Pry off the grease cup (6) to provide access
the cone or cup of a bearing set is damaged, you must
to cotter pin (7) and nut (8).
replace both parts. To replace bearing cups, drive them
(2) If the tires leak or if they are damaged, you
out of the hub using a hammer and soft drift. Take care
should service them as directed above. If tires do not
to prevent damage to the bearing seats in the hub.
require servicing, they can remain on the wheels.
Press new cups into the hub so that they are fully
(3) Do not remove the bearing cups (13 and 14)
from the hub (15) unless they are damaged or unless
(6) Discard and replace the grease seal (12).
you plan to replace the bearing cones (10 and 11). The
c. Reassembly and Installation. Reassembly and
bearing cups (13 and 14) and bearing cones (10 and 11)
installation is essentially the reverse of disassembly
must be replaced as sets.
b. Cleaning and Inspection.
sequence; refer to figure 4-32. Use new seals for
reassembly. When installing the wheel bearings, you
(1) Discard all gaskets and seals.
should service and adjust them as follows:
(1) Pack wheel bearings with grease before
Clean all parts in a well-ventilated
installing them in the hub. Refer to LO 5-4320-234-12
area. Avoid inhalation of solvent
(2) Take care to prevent damage to the lips of
fumes and prolonged exposure of
the grease seal (12, fig. 4-32) when installing the
skin to cleaning solvent.
exposed skin thoroughly.
(3) As you install the hub assembly, adjust the
cleaning solvent (fed. spec. P-D-680)
wheel bearings as follows:
used to clean parts is potentially
(a) With the wheel and tire installed on the
hub, tighten the nut (8) while rotating the wheel and tire
property. Do not use near open
until a distinct drag is felt.
flame or excessive heat. Flash point
of solvent is 100° to 138°F (38° to
(b) Continue to rotate the wheel and tire
and back off the nut just enough to release the drag on
(2) Clean the bearing sets by placing them in a
the wheel. Insert the cotter pin (7) and bend it over to
wire basket and agitating them in a container of cleaning
lock the nut (8) in position.
solvent (fed. spec. P-D-680). After you clean the
bearings, dip them in light oil and wrap in lint-free paper
(c) Drive the grease cup (6) onto the hub.
to prevent entry of dirt and grit.
(3) Clean all other parts with dry cleaning
solvent; dry thoroughly.
(4) Inspect the wheel for cracks, distortion,
Section XVI. MAINTENANCE OF CHASSIS COMPONENTS
In this manner, the towing vehicle controls and powers
a. The tool storage box is installed on the right rear
the lighting system of the chassis. The chassis lighting
consists of two stop, tail, and directional lights and one
of the chassis frame.
b. The tow bar is installed in a tube at the front of
blackout stop light.
the chassis frame.
4-54. Tool Box
c. Four reflectors are mounted on the chassis
a. Removal. To remove the tool box (4, fig. 433),
frame. Red reflectors are mounted at the rear and
open the tool box cover, and remove the four cap
amber reflectors are mounted at the front.
d. The interconnecting cable terminates with a plug
screws (1), lock washers (3), and nuts (2). Lift the tool
box from the frame.
that is inserted into a connector on the towing vehicle.
This cable connects to the chassis wiring harness.