Tire Replacement - TM-10-3930-621-340135

TM 10-3930-621-34

(3) Aline pins and install bull gear (2) to wheel

f. Position new tire on top of wheel and old tire

(4) using screws (6) from other side of wheel.

assembly. Aline new tire and the wheel and old tire

Tighten screws evenly and in sequence. (4) Remove

assembly so that they are concentric with each other (fig.

screws (6) and secure bull gear (2) to wheel (4) with

8-7).

screws (6) and lock washers (5) as originally installed.

Note. Make certain the outside of the wheel is

Torque screws to 28 to 32 foot- pounds.

positioned upwards, because the outside edge of the

(5) Lubricate bull gear (TM 10-3930-621-12).

wheel has a slight chamfer to help guide the wheel into

(6) Install hub cap (10), cotter pin and wheel nut,

the new tire. The tire can only be installed in one

inner bearing cone (13), outer bearing cone (14) and

direction to prevent damage to the wheel.

grease shield (TM 10-3930-621-12).

(7) Mount new tire (1) on wheel (4) (para 8- 17),

if replacement is necessary. b.

Steering Wheel

Assembly. Refer to figure 8-6 and assemble as follows:

(1) Press bearing cups (2 and 4) in wheel hub.

Caution: Pressure must be evenly distributed

on cups to avoid damage and cocking.

(2) Install hub cap (7), cotter pin (8), wheel nut

(9), washer (10), and bearing cones (11 and 12) (TM 10-

3930-621-12)}.

(3) Mount new tire (1) on wheel (3) (para 8- 17),

if replacement is necessary.

8-16. Installation

Refer to TM 10-3930-621-12 for installation procedures

of either steering or drive wheel assemblies.

Note: Wheels must rotate freely, with no bearing end-

play.

8-17. Tire Replacement

Refer to figure 8-7 and the following procedure for the

removal:

a. Remove wheel and tire assembly (TM 10- 3930-

621-12).

b. Check inside diameter of new tire. Remove any

signs of scale or rust with sandpaper. Lubricate inside of

Figure 8-7. Tire positioning for replacement.

new tire with bearing grease (GAA).

c. Place a circular ram on the press table. The

g. Start pressing new tire on the wheel and worn tire

length of the ram must be greater than the width of the

off the wheel. Run press slowly for the first inches of

tire to allow complete removal of the old tire. The outside

travel. If tire begins to cock, stop press and realine

diameter of the ram must be large enough to rest

wheel and tires. A sharp jar with a mallet will normally

squarely on the bull gear's flat surface (drive wheels) or

realine wheel and tire. If the wheel is to be recessed in

on the flat surface provided around the wheel hub (steer

the tire, stop the press after the wheel has started into

wheels).

the new tire and position a spacer on the inside diameter

d. If the outside edge of the wheel is not flush with

of the new tire. The spacer must rest squarely on the

the edge of the metal insert in the old tire, measure how

outer edge of the wheel. Continue pressing the new tire

far wheel is recessed inside the tire. New tires must be

on wheel until tire is correctly positioned.

installed in the same position as the worn tire. A spacer,

h. Release press and remove tires. Inspect new

slightly smaller in diameter than the inside diameter of

wheel and tire assembly.

the tire and the same thickness as the depth of the

i. Install new wheel and tire assembly (para 8- 15 a

recess can be used to obtain the proper amount of

or 8-15 b).

recess.

e. Center worn tire and wheel assembly over ram.

Be sure ram and wheel match squarely.

8-9