Wheel and Hub Assembly - TM-5-4320-234-120086

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.

Remove and

(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)

seated.

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:

WARNING

(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

(fig. 3-1).

(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.

Wash

assembled hub.

exposed skin thoroughly.

Dry

(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

dangerous

personnel

and

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 138F (38 to

(b) Continue to rotate the wheel and tire

59C).

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

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

4-53. Description

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.

4-56