Section VII. TIRES

Section VII. TIRES

wheel. Because of this, a chamfer has been provided on

3-49. General

the outside edge of the wheel and on the end of the

Refer to TM 10-3930-620-12 for removal and installation

inside diameter of the tire's metal insert. The chamfers

of drive or steer wheels and servicing of wheel bearings.

help center the wheel and tire during the pressing

3-50. Cushion Tire Replacement

operation and reduce the possibility of misalignment.

a. General. The wheels used for cushion tires are

machined from castings. Any misalignment of the tire

and wheel, while the tire is being pressed

onto the wheel, can cause possible damage to the

Figure 3-92. Cushion tire replacement.

b. Procedure.

measure how far wheel is recessed inside the tire.

New tire must be replaced at the same position that the

(1) Check inside diameter of metal insert of

worn tire is installed on the wheel. A spacer, slightly

new tire. Remove any scale or rust with sandpaper.

smaller in diameter than the inside diameter of the tire

Clean inside of metal insert and lubricate it with bearing

insert and the same thickness as the depth of the

grease.

recess, can be used to obtain the proper amount of

(2) Place a circular ram on the press table.

recess.

The length of the ram must be longer than the width of

(4) Position wheel assembly with worn tire on

the old tire that is to be removed to allow complete

top of circular ram so outside of wheel is positioned

removal of old tire.

The outside diameter of the ram

upward. The outside edge of the wheel has a chamfer to

must be small enough to fit loosely in the insert of the

help guide the new tire onto the wheel. The chamfered

tire, but must be large enough to rest squarely on the bull

edge must always be the leading edge of the wheel

gear's flat surface (drive wheel or on the flat surface at

whenever a tire is pressed onto a wheel.

the outer edge of the wheel (steer wheel).

(5) Center the wheel assembly on top of the

(3) If the outside edge of the wheel is not flush

ram and make certain they make-up

with the edge of the metal insert in the old tire.

3-101