Figure 2-202. Removing outer bearing adjusting nut

Tire (with Bolted-on Side Ring) and Tube Assembly

Section XXXII. MAINTENANCE OF STEERING SYSTEM

TM-9-2320-211-20 Truck Chassis: 5-Ton 6x6 M39 M39A2 M40 M40A1 M40A2 M40A1C M40A2C M61 M61A1 M61A1 M61A2 M63 M63A1 Manual
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198

C3, TM 9 - 2 3 2 0 - 2 1 1 - 2 0

or play.

(3) If the wheels are correctly adjusted, play or

wobble will be barely perceptible, and the wheel and / or

wheels will turn easily.

(4) If the adjustment is correct, lower the wheel to

the ground. If the adjustment is necessary, follow the

procedures in steps (5) thraugh (10) below.

(5) With the wheel raised, remove the 10 drive-

flange retaining screws (fig. 2-198), and remove the flange

from the hub.

NOTE

The rear axle shaft is also removed when

removing the drive flange from the rear hub.

(6) Using the wheel nut wrench (5, fig. 2-4), as

shown in figure 2-202, remove the outer bearing adjusting

nut washer.

Figure 2-202. Removing outer bearing adjusting nut.

(7) While turning the wheel, tighten the inner

bearing adjusting nut (3, fig. 2-200, using large end of the

wrench. Torque to 50 lb-ft to correctly position bearings;

(4) Remove the outer-bearing oil seal (4, fig. 2-200)

then back off nut approximately 1/16 to 1/4 turn,

from the hub outer bore (rear axles only).

Recheck the wheel bearing adjustment as described in (1)

(5) Remove the outer tapered roller bearing cone (9,

fig. 2-200).

through (3) above.

(8) Use the wheel nut wrench to install the adjusting

(6) Remove the hub and drum assembly (fig. 2-201)

nut washer (2, fig. 2-200) and outer bearing adjusting nut.

from the axle spindle (10, fig. 2-200).

(7) Remove the 10 nuts (fig. 2-201) and lockwashers

Torque to 325 75 lb-ft.

securing the brake drum to the hub, pry the drum from

(9) Check the adjustment. Position the drive flange

(fig. 2-175) on the hub, and install the 10 retaining screws.

the hub.

b. Installation.

NOTE

(1) Position the brake drum on the studs at the hub

When installing the drive flange at the rear

outer flange, and install 10 lockwashers (fig. 2-29) and

hubs, the rear axle shaft must be installed

nuts on the studs. Tighten the nuts.

also.

(2) Install the hub and drum assembly (fig. 2-201)

on the axle spindle so that the inner tapered roller bearing

(10) Lower the wheel and remove the jack.

cone and inner-bearing oil seal enter the hub inner bore.

b. Removal.

(3) Install the outer tapered roller bearing cone (9,

(1) Remove the hub and drum assembly as

fig. 2-200) in the hub outer bore against the outer tapered

described in paragraph 2-210a.

roller bearing cup.

(2) Remove the inner bearing oil seal (6, fig. 2-200)

(4) Install the outer bearing oil seal (4, fig. 2-200) on

and the inner tapered roller bearing cone (8, fig. 2-200)

the spindle against the cone (rear axles only).

from the hub.

(5) Using a wheel nut wrench (5, fig. 2-4), install the

c. Cleaning and Inspecion.

inner bearing adjustment nut on the spindle.

(1) Clean both the inner and outer tapered roller

(6) Install the wheel and tire assembly (para 2-207c).

bearing cones.

(7) Adjust the wheel bearings (para 2-211a).

(2) Inspect the cones for excessive wear and other

defects which would prevent smooth operation and

replace the cones if necessary.

2-211. Wheel Bearings.

(3) Inspect the bearing cups in the hub bores for

a. Adjustment.

wear, scoring, or distortion. If necessary, replace the cups

as described in paragraph 2-212.

NOTE

d. Installation.

(1) Lubricate the inner and outer tapered roller

Before adjusting the wheel bearings (front

bearing cones (para 2-212).

and or rear), m a k e the inspection as

(2) Install the inner bearing oil seal (6, fig. 2-200)

described in (1) through (4) below.

and inner tapered roller bearing cone (8, fig. 2-200) on the

spindle.

(1) Raise the wheel until it clears the ground.

(3) Install the hub and drum assembly as described

(2) Grasp the top of the tire, and alternately push

in paragraph 2-210.

and pull on the tire. Observe the amount of wheel wobble

2-171

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